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All questions of Anatomy of Flowering Plants for NEET Exam
The function of root cap is- a)Protection of root tip and control of geotropic movement
- b)Storage of food products
- c)Absorption of nutrients
- d)None of the above
Correct answer is option 'C'. Can you explain this answer?
The function of root cap is
a)
Protection of root tip and control of geotropic movement
b)
Storage of food products
c)
Absorption of nutrients
d)
None of the above
|
Vijay Bansal answered |
In plants having a taproot system, the trunk-like primary root develops directly from the embryonic root called radicle and grows downward into the soil. From this taproot, lateral roots develop which may initially grow horizontally then turn downward. These roots repeatedly form finer roots which terminate in a root tip with a minute, dome-shaped, protective root cap at the tipmost part. As the root grows, it pushes its root cap forward, probing the soil and absorbing water and nutrients mainly through fine root hairs. The root hairs are extensions of the epidermis which develop in the region of differentiation. These plant organs are short-lived and constantly replaced.
Branch of Botany which deals with the study of internal organization of plants is- a)Physiology
- b)Ecology
- c)Anatomy
- d)Cytology
Correct answer is option 'C'. Can you explain this answer?
Branch of Botany which deals with the study of internal organization of plants is
a)
Physiology
b)
Ecology
c)
Anatomy
d)
Cytology
|
Jeeshan Ahmed answered |
Study of internal organization of plants is called anatomy. Plant anatomy is basically a branch of botany that is all about the study of internal structure of plants and it is also called as Phytotomy
A meristem may be defined as the group of cells which -- a)Add to the bulk of the Plants.
- b)Conserve food
- c)Divide continuously to give rise to new cells.
- d)Elongate and add to the group of cells.
Correct answer is option 'A'. Can you explain this answer?
A meristem may be defined as the group of cells which -
a)
Add to the bulk of the Plants.
b)
Conserve food
c)
Divide continuously to give rise to new cells.
d)
Elongate and add to the group of cells.
|
Ciel Knowledge answered |
- A meristem may be defined as the group of cells which divide continuously to give rise to new cells.
- A meristem is the tissue in most plants containing undifferentiated cells, found in zones of the plant where growth can take place.
- Meristematic cells give rise to various organs of the plant and keep the plant growing.
- Meristematic cells are incompletely or not at all differentiated and are capable of continued cellular division. Furthermore, the cells are small and protoplasm fills the cell completely. The vacuoles are extremely small.
- The cytoplasm does not contain differentiated plastids, although they are present in rudimentary form- proplastids.
- Meristematic cells are packed closely together without intercellular cavities.
- The cell wall is a very thin primary cell wall.
Thus, the correct answer is option C.
The secondary meristem originates froma)Promeristemb)Permanent tissuec)Primary meristemd)Secretory tissueCorrect answer is option 'B'. Can you explain this answer?
|
Impact Learning answered |
On the basis of origin and development, meristem is grouped as promeristem, primary and secondary meristem. Promeristem includes undifferentiated, actively dividing apical initials which are derived from embryonic tissues and give rise to primary meristem. Primary meristem is derived from promeristem or embryonic meristem and produce primary permanent tissues of primary plant body. Secondary meristem develops from permanent tissues during secondary growth and gives rise to secondary tissues. Secretory tissues are the permanent primary tissues, which are derived from promeristem.
Thus, the correct answer is option B
Maximum growth in root occurs -- a)At its tip
- b)Towards light
- c)Behind the apex
- d)Towards apex
Correct answer is option 'C'. Can you explain this answer?
Maximum growth in root occurs -
a)
At its tip
b)
Towards light
c)
Behind the apex
d)
Towards apex
|
Priya Menon answered |
Maximum growth of root takes place in the back side portion of the root apex. Apex portion is made up of root cap and then follows the region of cell division where meristematic tissues are present.
Bamboo, grass and mint stem elongate by the activity of -- a)Primary meristem
- b)Secondary meristem
- c)Intercalary meristems
- d)Apical meristems
Correct answer is option 'C'. Can you explain this answer?
Bamboo, grass and mint stem elongate by the activity of -
a)
Primary meristem
b)
Secondary meristem
c)
Intercalary meristems
d)
Apical meristems
|
Sushil Kumar answered |
Bamboo, grass and mint stem elongate by the activity of Intercalary meristems. Intercalary meristem at base of leaves or nodes of grasses is responsible for primary growth. Meristems are classified by their location as apical located at root and shoot tips, lateral in the vascular and cork cambia, and intercalary at internodes, or stem regions between the places at which leaves attach and leaf bases. Intercalary meristem cells possess the ability to divide and produce new cells, as do apical and lateral meristems. They differ, however, in being situated between regions of mature tissue, such as at the base of grass leaves, which are themselves located on mature stem tissue.
Thus, the correct answer is option C.
Thus, the correct answer is option C.
In plants, during embryonic condition- a)All cells of the embryo divide
- b)Meristematic activity is confined to single apical cell
- c)Meristematic activity is confined to a group of apical cells.
- d)Apical & lateral cells only divide
Correct answer is option 'C'. Can you explain this answer?
In plants, during embryonic condition
a)
All cells of the embryo divide
b)
Meristematic activity is confined to single apical cell
c)
Meristematic activity is confined to a group of apical cells.
d)
Apical & lateral cells only divide
|
Rohan Singh answered |
Plant embryogenesis is a process that occurs after the fertilization of an ovule to produce a fully developed plant embryo. This is a pertinent stage in the plant life cycle that is followed by dormancy and germination.The zygote produced after fertilization, must undergo various cellular divisions and differentiations to become a mature embryo.An end stage embryo has five major components including the shoot apical meristem, hypocotyl, root meristem, root cap, and cotyledons.Unlike animal embryogenesis, plant embryogenesis results in an immature form of the plant, lacking most structures like leaves, stems, and reproductive structures.
Mechanical tissue consisting of living cells is -- a)Sclerenchyma
- b)Collenchyma
- c)Chlorenchyma
- d)Parenchyma
Correct answer is option 'D'. Can you explain this answer?
Mechanical tissue consisting of living cells is -
a)
Sclerenchyma
b)
Collenchyma
c)
Chlorenchyma
d)
Parenchyma
|
Saumya Dey answered |
Collenchyma cells are mechanical tissue, they possess thickening of corners of cells.
Meristems are not found in -
a) Cycas stem
b) Fern leaf
c) Fern rhizome
d) Pollen of pinus
Correct answer is option 'D'. Can you explain this answer?
b) Fern leaf
c) Fern rhizome
d) Pollen of pinus
Correct answer is option 'D'. Can you explain this answer?
|
Lohit Matani answered |
Pollen of Pinus do not have meristems. A meristem is the tissue in most plants containing undifferentiated cells, found in zones of the plant where growth can take place. Meristematic cells give rise to various organs of the plant and keep the plant growing. Meristematic cells are incompletely or not at all differentiated, and are capable of continued cellular division.
Thus, the correct answer is option D.
Which of the following do not undergo anysecondary growth?
- a)Dicotyledonous stem
- b)Monocotyledonous root
- c)Monocotyledonous stem
- d)Both (B) and (C)
Correct answer is option 'D'. Can you explain this answer?
Which of the following do not undergo anysecondary growth?
a)
Dicotyledonous stem
b)
Monocotyledonous root
c)
Monocotyledonous stem
d)
Both (B) and (C)
|
Prasenjit Pillai answered |
Monocotyledonous roots and stems generally do not undergo secondary growth:
-
Monocotyledonous rootsMonocot roots do not undergo secondary growth because they lack vascular cambium, which is found in the vascular bundle between the xylem and phloem.
-
Monocotyledonous stemsMonocot stems do not undergo secondary growth, but they can increase in girth. This is called anomalous thickening and does not result in the development of secondary xylem and phloem
Which of the following tissues form the main bulk of storage organ- a)Parenchyma
- b)Collenchyma
- c)Sclerenchyma
- d)Aerenchyma
Correct answer is option 'A'. Can you explain this answer?
Which of the following tissues form the main bulk of storage organ
a)
Parenchyma
b)
Collenchyma
c)
Sclerenchyma
d)
Aerenchyma
|
Virat answered |
Main function of parenchyma is storage of food.
A simple mechanical tissue devoid of lignin is -- a)Parenchyma
- b)Collenchyma
- c)Sclerenchyma
- d)Chlorenchyma
Correct answer is option 'B'. Can you explain this answer?
A simple mechanical tissue devoid of lignin is -
a)
Parenchyma
b)
Collenchyma
c)
Sclerenchyma
d)
Chlorenchyma
|
|
Rohit Shah answered |
The question is asking for "mechanical tissue". Both sclerenchyma and collenchyma are mechanical tissues, but sclerenchyma contains lignin. Hence the simple mechanical tissue without lignin is chollenchyma.
The tissue not having specifically thickened walls are- a)Parenchyma
- b)Collenchyma
- c)Fibres
- d)Sclereids
Correct answer is option 'A'. Can you explain this answer?
The tissue not having specifically thickened walls are
a)
Parenchyma
b)
Collenchyma
c)
Fibres
d)
Sclereids
|
Notes Wala answered |
- Parenchyma cells are thin-walled and are not specifically thickened, making them different from the other tissues mentioned.
- Collenchyma cells have thickened cell walls at the corners, providing mechanical support.
- Fibres and sclereids are types of sclerenchyma, which are characterized by having thick, lignified cell walls.
- Therefore, parenchyma is the tissue that does not have specifically thickened walls.
Phloem of angiosperm is different from that of pteridophytes and gymnosperm in -
a) The absence of enzymes
b) Presence of endocytosis
c) Presence of companion cells
d) None of these
Correct answer is option 'C'. Can you explain this answer?
|
Harsh Sharma answered |
I think the answer should be c because pteridophytes and gymnosperms contains albuminous cells in place of companion cell
Bordered pits are very common among tracheids of -
- a)Gymnosperm
- b)Dicotyledons
- c)Pteridophytes
- d)Monocotyledons
Correct answer is option 'A'. Can you explain this answer?
Bordered pits are very common among tracheids of -
a)
Gymnosperm
b)
Dicotyledons
c)
Pteridophytes
d)
Monocotyledons
|
|
Vijay Bansal answered |
Tracheids are the chief water-conducting elements in gymnosperms and seedless vascular plants. They can also be found in angiosperms. Tracheids are elongated cells, closed at both ends. The walls are opened by numerous pits that are, depending on their origin, either round, oval, gap- or groove-shaped. Bordered pits are especially common in the tracheids of some gymnosperms.
Correct option is A.
Correct option is A.
A tissue is a group of cells which are -- a)Similar in origin, but dissimilar in form and function.
- b)Dissimilar in origin, form and function.
- c)Dissimilar in origin, but similar in form and function.
- d)Similar in origin, form and function.
Correct answer is option 'A'. Can you explain this answer?
A tissue is a group of cells which are -
a)
Similar in origin, but dissimilar in form and function.
b)
Dissimilar in origin, form and function.
c)
Dissimilar in origin, but similar in form and function.
d)
Similar in origin, form and function.
|
|
Pooja Mehta answered |
Tissues are large groups of cells all doing the same job. The different kinds of tissues are classified into four groups, epithelial tissue, connective tissue, nerve tissue, and muscle tissue. Within each group are many kinds of tissue, but they are similar in the job they do.
Which of the following plant organs do not contain collenchyma
a)Leaf basesb)Monocot stemc)Rootsd)All of the aboveCorrect answer is option 'D'. Can you explain this answer?
|
Hansa Sharma answered |
Collenchyma is simple living tissue with thick non-lignified walls and uneven deposition of cellulose and pectin. They are derived from parenchyma and are present in groups under epidermis to provide flexible support to the growing plant's organs and thus are present in young dicot stem, pedicel, and petioles, not in leaf base and roots, which are not the growing part. It is not present in monocots.
The casparian thickening occurs in the cells of
- a)Pericycle of root
- b)Endodermis of stem
- c)Endodermis of root
- d)Pericycle of stem
Correct answer is option 'C'. Can you explain this answer?
The casparian thickening occurs in the cells of
a)
Pericycle of root
b)
Endodermis of stem
c)
Endodermis of root
d)
Pericycle of stem
|
Aniket Chawla answered |
Casparian strips occur in the Endodermis. It is a cell wall material that is deposited in the radial and transverse walls of the endodermis of roots.
Collenchyma differs from sclerenchyma in -- a)Retaining protoplasm at maturity
- b)Having thick walls
- c)Having a wide lumen
- d)Being meristematic
Correct answer is option 'A'. Can you explain this answer?
Collenchyma differs from sclerenchyma in -
a)
Retaining protoplasm at maturity
b)
Having thick walls
c)
Having a wide lumen
d)
Being meristematic
|
|
Priya Menon answered |
Collenchyma tissue is composed of elongated cells with irregularly thickened walls. They provide structural support and flexibility to the growing stems.
Sclerenchyma is the supporting tissue in plants. It is composed of dead cells which is completely devoid of protoplasm.
Therefore, the correct answer is option A.
Which of the following is a primary meristem- a)Intra fascicular cambium
- b)Cork cambium
- c)Vascular cambium in roots
- d)None of the above
Correct answer is option 'B'. Can you explain this answer?
Which of the following is a primary meristem
a)
Intra fascicular cambium
b)
Cork cambium
c)
Vascular cambium in roots
d)
None of the above
|
|
Pooja Shah answered |
The cork cambium is a lateral meristem and is responsible for secondary growth that replaces the epidermis in roots and stems. It is found in woody and many herbaceous dicots, gymnosperms and some monocots (monocots usually lack secondary growth).
Fibre (longest plant cell), belongs to which tissue -
a) Parenchyma
b) Collenchyma
c) Aerenchyma
d) Sclerenchyma
Correct answer is option 'D'. Can you explain this answer?
|
|
Hansa Sharma answered |
Sclerenchyma is a simple permanent tissue which is mainly composed of dead cells. The walls consist of cellulose, hemicellulose and lignin. These are the principal supporting cells in plant tissues that have ceased elongation.
Sclerenchyma fibres are of great economical importance, since they constitute the source material for many fabrics (flax, hemp, jute, ramie).
So, the correct answer is option D.
Sclerenchyma fibres are of great economical importance, since they constitute the source material for many fabrics (flax, hemp, jute, ramie).
So, the correct answer is option D.
Tracheids and vessels are present in all except - a)Marselia
- b)Equisetum
- c)Gnetum
- d)Cycas
Correct answer is option 'D'. Can you explain this answer?
Tracheids and vessels are present in all except
a)
Marselia
b)
Equisetum
c)
Gnetum
d)
Cycas
|
Abhishek Desai answered |
Tracheids are elongated cells in the xylem of vascular plants that serve in the transport of water and mineral salts. Tracheids are Cycas one of two types of tracheary elements, vessel elements being the other. Tracheids, unlike vessel elements, do not have perforation plates.
A mature sieve tube differs from a vessel -- a)In lacking a functional nucleus
- b)Absence of lignified walls
- c)Being nearly dead
- d)Lacking cytoplasm
Correct answer is option 'B'. Can you explain this answer?
A mature sieve tube differs from a vessel -
a)
In lacking a functional nucleus
b)
Absence of lignified walls
c)
Being nearly dead
d)
Lacking cytoplasm
|
|
Abhishek Desai answered |
Solution :
The walls of vessels are lignified and hard and not very thick. Sieve tubes have thin cellulose walls.
The tissue responsible for translocation of food material is -- a)Parenchyma
- b)Phloem
- c)Vessels
- d)Fibres
Correct answer is option 'B'. Can you explain this answer?
The tissue responsible for translocation of food material is -
a)
Parenchyma
b)
Phloem
c)
Vessels
d)
Fibres
|
|
Abhishek Desai answered |
Translocation occurs within a series of cells known as the phloem pathway, or phloem transport system, with phloem being the principal food-conducting tissue in vascular plants. Nutrients are translocated in the phloem as solutes in a solution called phloem sap.
Collenchyma is found in -- a)Herbaceous climbers
- b)Hydrophytes
- c)Climbing stems
- d)Xerophytes
Correct answer is option 'C'. Can you explain this answer?
Collenchyma is found in -
a)
Herbaceous climbers
b)
Hydrophytes
c)
Climbing stems
d)
Xerophytes
|
|
Mahesh Mahajan answered |
Collenchyma occurs in climbing stems. Collenchyma occurs in the stem and petioles of dicot herbs. Due to deposition of pectin, it has high water retaining capacity. Since pectin appears at the angles, it becomes a spongy tissues.
Read the following statements and select the correct option.
Statement 1 : Anatomically, all the tissues present on the inner side of endodermis such as pericyde, vascular bundles and pith constitute the stele.
Statement 2 : Eustele is the stele in which vascular bundles are arranged in the form of a ring as present in dicot stems.
- a)Statement 1 is correct but statement 2 is incorrect
- b)Both statements 1 and 2 are correct
- c)Statement 1 is incorrect but statement 2 is correct
- d)Both statements 1 and 2 are incorrect
Correct answer is option 'B'. Can you explain this answer?
Read the following statements and select the correct option.
Statement 1 : Anatomically, all the tissues present on the inner side of endodermis such as pericyde, vascular bundles and pith constitute the stele.
Statement 2 : Eustele is the stele in which vascular bundles are arranged in the form of a ring as present in dicot stems.
Statement 1 : Anatomically, all the tissues present on the inner side of endodermis such as pericyde, vascular bundles and pith constitute the stele.
Statement 2 : Eustele is the stele in which vascular bundles are arranged in the form of a ring as present in dicot stems.
a)
Statement 1 is correct but statement 2 is incorrect
b)
Both statements 1 and 2 are correct
c)
Statement 1 is incorrect but statement 2 is correct
d)
Both statements 1 and 2 are incorrect
|
|
Vivek Patel answered |
The term stele was coined by Van Tiegham and Dauliot (1886). It is the axial portion of plant axis. Anatomically, all the tissues on the innerside of endodermis such as pericyde, vascular bundles and pith constitute the stele. Eustele is the type of stele in which a ring of vascular bundles is present around the central pith and inner to the pericyde e.g., dicot stem. Stele containing irregularly scattered vascular bundles is called atactostele, e.g., monocot stem. Pteridophytes are the first plants possenssing stele.
Aerating pores in the bark of plants is known as- a)Lenticels
- b)Stomata
- c)Air pore
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
Aerating pores in the bark of plants is known as
a)
Lenticels
b)
Stomata
c)
Air pore
d)
None of these
|
Kunal Rane answered |
In plants respiratory organs in stem is called lenticels. They are located as pores in the bark of plants.
Phloem parenchyma is absent in -- a)Dicot stem
- b)Dicot leaf
- c)Monocot stem
- d)Dicot root
Correct answer is option 'C'. Can you explain this answer?
Phloem parenchyma is absent in -
a)
Dicot stem
b)
Dicot leaf
c)
Monocot stem
d)
Dicot root
|
|
Preeti Iyer answered |
Dicot root – phloem parenchyma is present.
Dicot leaf – Phloem parenchyma is present.
Monocot stem – phloem parenchyma is absent.
Dicot stem – Phloem parenchyma is present.
So, the correct answer is 'Monocot stem'.
Dicot leaf – Phloem parenchyma is present.
Monocot stem – phloem parenchyma is absent.
Dicot stem – Phloem parenchyma is present.
So, the correct answer is 'Monocot stem'.
Sclerenchymatous cells in their cell walls have large percentage of -- a)Lignin
- b)Cellulose
- c)Pectin
- d)Silica
Correct answer is option 'A'. Can you explain this answer?
Sclerenchymatous cells in their cell walls have large percentage of -
a)
Lignin
b)
Cellulose
c)
Pectin
d)
Silica
|
Aasiya Ali answered |
Sclerenchymatous cells in their cell walls are mainly composed of lignin because the main function of these cells is to provide structural support to the plant body. the deposition of lignin in their cell walls provide more stability.
Which among the following is incorrect about different cells in Xylem?- a)Xylem fibers are perforated and help in conduction of water to branches
- b)Xylem vessels have lignified walls without protoplasm
- c)Xylem parenchymatic tissues are made of thin-walled living cells and conduct water sideways
- d)Tracheids are tubular structures made of dead cells without protoplasm
Correct answer is option 'A'. Can you explain this answer?
Which among the following is incorrect about different cells in Xylem?
a)
Xylem fibers are perforated and help in conduction of water to branches
b)
Xylem vessels have lignified walls without protoplasm
c)
Xylem parenchymatic tissues are made of thin-walled living cells and conduct water sideways
d)
Tracheids are tubular structures made of dead cells without protoplasm
|
Stepway Academy answered |
- Tracheids are tubular structures made of dead cells without protoplasm.
- Xylem vessels have lignified walls without protoplasm.
- Xylem parenchymatic tissues are made of thin-walled living cells and conduct water sideways.
- Xylem vessels are perforated and help in conduction of water to branches.
How many of the following constitute the stele?Vascular bundles, pericycle, endodermis, pith, cortex, epidermis- a)4
- b)3
- c)2
- d)5
Correct answer is option 'B'. Can you explain this answer?
How many of the following constitute the stele?
Vascular bundles, pericycle, endodermis, pith, cortex, epidermis
a)
4
b)
3
c)
2
d)
5
|
|
Baishali Desai answered |
Understanding the Stele
The stele is a crucial part of the plant root and stem anatomy, involved primarily in the transport of water, nutrients, and food. It is essential to differentiate which structures constitute the stele.
Components of the Stele
The stele primarily includes:
- Vascular Bundles: These are responsible for the conduction of water (xylem) and nutrients (phloem).
- Pericycle: This is the layer of cells just inside the endodermis, from which lateral roots arise.
- Endodermis: This is the innermost layer of the cortex, forming a selective barrier to regulate the flow of water and nutrients into the vascular system.
Other Structures
The following do NOT constitute the stele:
- Pith: This is central tissue found in some stems, but is not part of the stele.
- Cortex: This is the layer of ground tissue between the epidermis and the vascular tissues, also not included in the stele.
- Epidermis: This is the outer protective layer of the plant, which does not form part of the stele.
Conclusion
Thus, the correct answer is option 'B', as only three structures (vascular bundles, pericycle, and endodermis) comprise the stele. Recognizing these components is essential for understanding plant physiology, particularly in the context of nutrient and water transport.
The stele is a crucial part of the plant root and stem anatomy, involved primarily in the transport of water, nutrients, and food. It is essential to differentiate which structures constitute the stele.
Components of the Stele
The stele primarily includes:
- Vascular Bundles: These are responsible for the conduction of water (xylem) and nutrients (phloem).
- Pericycle: This is the layer of cells just inside the endodermis, from which lateral roots arise.
- Endodermis: This is the innermost layer of the cortex, forming a selective barrier to regulate the flow of water and nutrients into the vascular system.
Other Structures
The following do NOT constitute the stele:
- Pith: This is central tissue found in some stems, but is not part of the stele.
- Cortex: This is the layer of ground tissue between the epidermis and the vascular tissues, also not included in the stele.
- Epidermis: This is the outer protective layer of the plant, which does not form part of the stele.
Conclusion
Thus, the correct answer is option 'B', as only three structures (vascular bundles, pericycle, and endodermis) comprise the stele. Recognizing these components is essential for understanding plant physiology, particularly in the context of nutrient and water transport.
Conjoint type of vascular bundles are common in- a)Stems, roots and leaves
- b)Leaves and roots
- c)Stems and leaves
- d)Stems and roots
Correct answer is option 'C'. Can you explain this answer?
Conjoint type of vascular bundles are common in
a)
Stems, roots and leaves
b)
Leaves and roots
c)
Stems and leaves
d)
Stems and roots
|
Rohan Unni answered |
In conjoint type of vascular bundles,the xylem and phloem are situated at the sameradius of vascular bundles. Such vascularbundles are common in stems and leaves. Theconjoint vascular bundles usually have thephloem located only on the outer side of xylem.
Guard cells of stomata are thicker- a)In middle
- b)Outer side
- c)Inner side
- d)Both side
Correct answer is option 'C'. Can you explain this answer?
Guard cells of stomata are thicker
a)
In middle
b)
Outer side
c)
Inner side
d)
Both side
|
Ishaan Menon answered |
The cells surrounding the stomata are called guard cells. The guard cells of inner side are thicker and that of outer side is comparatively thinner.
Study the following statements regarding the anatomy of Isobllateral leal.
(i) Stomata are equally distributed on both the surfaces.
(ii) Certain adaxlal epidermal cells are modified Into bulllform cells in grasses.
(iii) The vascular bundles are radial.
(iv) Phloem is adaxially placed.
Which of the above statements are correct?- a)(i) and (ii)
- b)(ii) and (iii)
- c)(ii) and (iv)
- d)All are correct
Correct answer is option 'A'. Can you explain this answer?
Study the following statements regarding the anatomy of Isobllateral leal.
(i) Stomata are equally distributed on both the surfaces.
(ii) Certain adaxlal epidermal cells are modified Into bulllform cells in grasses.
(iii) The vascular bundles are radial.
(iv) Phloem is adaxially placed.
Which of the above statements are correct?
(i) Stomata are equally distributed on both the surfaces.
(ii) Certain adaxlal epidermal cells are modified Into bulllform cells in grasses.
(iii) The vascular bundles are radial.
(iv) Phloem is adaxially placed.
Which of the above statements are correct?
a)
(i) and (ii)
b)
(ii) and (iii)
c)
(ii) and (iv)
d)
All are correct
|
Ajay Yadav answered |
In an isobilateral (equifacial) leaf, vascular bundles are conjoint and collateral. Xylem lies towards the adaxial (upper) side and phloem lies towards abxialal (lower) side of leaf.
Assertion (A): Plant tissues are classified into meristematic and permanent types, which contribute to their various functions.Reason (R):
The main functions of plant tissues include food assimilation, storage, and mechanical support.- a)If both Assertion and Reason are true and Reason is the correct explanation of Assertion
- b)If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- c)If Assertion is true but Reason is false
- d)If both Assertion and Reason are false
Correct answer is option 'A'. Can you explain this answer?
Assertion (A): Plant tissues are classified into meristematic and permanent types, which contribute to their various functions.
Reason (R):
The main functions of plant tissues include food assimilation, storage, and mechanical support.
The main functions of plant tissues include food assimilation, storage, and mechanical support.
a)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion
b)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
c)
If Assertion is true but Reason is false
d)
If both Assertion and Reason are false
|
Prasenjit Khanna answered |
Understanding Plant Tissues
Plant tissues are essential components of plants, classified into two main types: meristematic and permanent. Each type plays a vital role in the overall functioning of the plant.
Assertion (A) Explained
- Meristematic Tissues: These are undifferentiated cells that can divide and contribute to growth. They are found in regions of the plant that are actively growing, like tips of roots and stems.
- Permanent Tissues: These tissues are differentiated and have specific functions. They include parenchyma, collenchyma, and sclerenchyma, each serving unique roles.
Reason (R) Explained
- Functions of Plant Tissues: The main functions of plant tissues encompass:
- Food Assimilation: Tissues like parenchyma are involved in photosynthesis and nutrient storage.
- Storage: Specialized tissues store starch, oils, and water.
- Mechanical Support: Sclerenchyma and collenchyma provide structural integrity and support to the plant.
Linking Assertion and Reason
- The reason elaborates on the functions of plant tissues, which directly relate to the types of tissues mentioned in the assertion.
- Meristematic tissues contribute to growth, while permanent tissues fulfill specific roles such as support and storage, thereby justifying the assertion.
Conclusion
Thus, both the assertion and reason are true, and the reason correctly explains the assertion. Therefore, the correct answer is option 'A'. Understanding this relationship helps in grasping the fundamental concepts of plant biology, crucial for NEET preparation.
Plant tissues are essential components of plants, classified into two main types: meristematic and permanent. Each type plays a vital role in the overall functioning of the plant.
Assertion (A) Explained
- Meristematic Tissues: These are undifferentiated cells that can divide and contribute to growth. They are found in regions of the plant that are actively growing, like tips of roots and stems.
- Permanent Tissues: These tissues are differentiated and have specific functions. They include parenchyma, collenchyma, and sclerenchyma, each serving unique roles.
Reason (R) Explained
- Functions of Plant Tissues: The main functions of plant tissues encompass:
- Food Assimilation: Tissues like parenchyma are involved in photosynthesis and nutrient storage.
- Storage: Specialized tissues store starch, oils, and water.
- Mechanical Support: Sclerenchyma and collenchyma provide structural integrity and support to the plant.
Linking Assertion and Reason
- The reason elaborates on the functions of plant tissues, which directly relate to the types of tissues mentioned in the assertion.
- Meristematic tissues contribute to growth, while permanent tissues fulfill specific roles such as support and storage, thereby justifying the assertion.
Conclusion
Thus, both the assertion and reason are true, and the reason correctly explains the assertion. Therefore, the correct answer is option 'A'. Understanding this relationship helps in grasping the fundamental concepts of plant biology, crucial for NEET preparation.
Which of the following conditions of xylem is present in both monocot and dicot stems?- a)Endarch
- b)Polyarch
- c)Mesarch
- d)Exarch
Correct answer is option 'A'. Can you explain this answer?
Which of the following conditions of xylem is present in both monocot and dicot stems?
a)
Endarch
b)
Polyarch
c)
Mesarch
d)
Exarch
|
|
Ajay Yadav answered |
Based on position of protoxylem in relation to metaxylem, the xylem may be exarch/centripetal, endarch/centrifugal, mesarch and centerarch. In endarch condition, protoxylem lies on the inner side of metaxylem e.g., dicot and monocot stems.
Tissue which develops more due to scarcity of water- a)Sclerenchyma
- b)Collenchyma
- c)Parenchyma
- d)Meristem
Correct answer is option 'D'. Can you explain this answer?
Tissue which develops more due to scarcity of water
a)
Sclerenchyma
b)
Collenchyma
c)
Parenchyma
d)
Meristem
|
Kavita Joshi answered |
A meristem is the tissue in most plants containing undifferentiated cells (meristematic cells), found in zones of the plant where growth can take place. Meristematic cells give rise to various organs of a plant and are responsible for growth.
Well develped pith is found in- a)monocot root and monocot stem
- b)monocot stem and dicot root
- c)monocot root and dicot stem
- d)dicot root and dicot stem
Correct answer is option 'C'. Can you explain this answer?
Well develped pith is found in
a)
monocot root and monocot stem
b)
monocot stem and dicot root
c)
monocot root and dicot stem
d)
dicot root and dicot stem
|
|
Anjali Sharma answered |
In a dicot stem, a well developed pith (made of parenchymatous or occasionally sclerenchymatous cells) is present whereas in a monocot stem, pith is absent. In a dicot root, pith is poorly developed whereas in a monocot root, a well developed pith is present.
Casparian strips are the bands of thickenings present on _____ walls of endodermis.- a)radial
- b)tangential
- c)central
- d)both (a) and (b)
Correct answer is option 'D'. Can you explain this answer?
Casparian strips are the bands of thickenings present on _____ walls of endodermis.
a)
radial
b)
tangential
c)
central
d)
both (a) and (b)
|
|
Priya Menon answered |
Endodermis is the innermost layer of cortex that consistws of tightly packed barrel shaped cells. It is called starch sheath in case of dicot stems. Radial and and tangential walls of endodermal cells possess thickenings of lignin, suberin and cutin in the form of strips or bands, which are known as casparian bands or casparian strips.
The vascular bundles are closed when they- a)Lack pericycle
- b)Have cambium
- c)Lack cambium
- d)Have pericycle
Correct answer is option 'C'. Can you explain this answer?
The vascular bundles are closed when they
a)
Lack pericycle
b)
Have cambium
c)
Lack cambium
d)
Have pericycle
|
Akshat Chavan answered |
In the monocotyledons, the vascular bundles have no cambium present in them. Hence, since they do not form secondary tissues they are referred to as closed.
Bordered pits occur in -- a)Sec. phloem
- b)Protoxylem
- c)Bark
- d)Metaxylem
Correct answer is option 'D'. Can you explain this answer?
Bordered pits occur in -
a)
Sec. phloem
b)
Protoxylem
c)
Bark
d)
Metaxylem
|
|
Mahin Medaka answered |
Tracheid is the fundamental single elongated dead cell of xylem. During cell wall thickening, deposition of lignin covers the whole primary cell wall of tracheid, except at gaps termed as 'bordered pit-pairs'. The pit pairs represent the small regions of the unlignified primary wall from two adjacent cells and are concentrated at end walls between cells, forming a pitted region called as pitted end walls. A pit pair shares a common membrane of the primary wall and middle lamella and the raised wall around the pit aperture serve as a border. The xylem which is formed first is present is termed as protoxylem, while metaxylem is the xylem that develops afterwards. Protoxylem is characterised by the presence of annual, spiral, scalariform vessels and no tracheids, while metaxylem has reticulated and pitted vessels and some tracheids.
##So, the correct answer is option C.##
The shape of guard cells in grasses is- a)Round
- b)Elliptical
- c)Kidney
- d)Dumb-bell
Correct answer is option 'D'. Can you explain this answer?
The shape of guard cells in grasses is
a)
Round
b)
Elliptical
c)
Kidney
d)
Dumb-bell
|
Yash Unni answered |
The shape of guard cells in grasses is Dumb-bell.
Explanation:
Guard cells are specialized cells found in the epidermis of plants, specifically in the leaves and stems. They are responsible for controlling the opening and closing of stomata, which are tiny pores on the surface of the leaves that facilitate gas exchange.
Importance of Guard Cells:
Guard cells play a crucial role in regulating the process of transpiration, which is the loss of water vapor from the plant through the stomata. By opening and closing the stomata, guard cells help to balance the uptake of carbon dioxide for photosynthesis and the loss of water vapor through transpiration.
Shape of Guard Cells in Grasses:
The shape of guard cells in grasses is typically dumb-bell-shaped. This shape is characterized by two curved lobes connected by a narrow waist or isthmus. The two lobes of the guard cells are typically larger and more rounded, while the waist region is narrower and more constricted.
Reason for Dumb-bell Shape:
The dumb-bell shape of guard cells in grasses is advantageous for efficient stomatal opening and closing. The curved lobes of the guard cells allow for a larger surface area, which facilitates the uptake of potassium ions and water into the cells. This influx of ions and water causes the guard cells to swell and bend, leading to the opening of the stomatal pore.
The narrow waist or isthmus region of the guard cells acts as a hinge, allowing the lobes to move independently. This flexibility enables the guard cells to change shape and control the size of the stomatal pore based on environmental conditions such as light intensity, humidity, and carbon dioxide levels.
Conclusion:
In conclusion, the shape of guard cells in grasses is dumb-bell-shaped, with two rounded lobes connected by a narrow waist. This shape allows for efficient control of stomatal opening and closing, which is essential for regulating gas exchange and water loss in plants.
Explanation:
Guard cells are specialized cells found in the epidermis of plants, specifically in the leaves and stems. They are responsible for controlling the opening and closing of stomata, which are tiny pores on the surface of the leaves that facilitate gas exchange.
Importance of Guard Cells:
Guard cells play a crucial role in regulating the process of transpiration, which is the loss of water vapor from the plant through the stomata. By opening and closing the stomata, guard cells help to balance the uptake of carbon dioxide for photosynthesis and the loss of water vapor through transpiration.
Shape of Guard Cells in Grasses:
The shape of guard cells in grasses is typically dumb-bell-shaped. This shape is characterized by two curved lobes connected by a narrow waist or isthmus. The two lobes of the guard cells are typically larger and more rounded, while the waist region is narrower and more constricted.
Reason for Dumb-bell Shape:
The dumb-bell shape of guard cells in grasses is advantageous for efficient stomatal opening and closing. The curved lobes of the guard cells allow for a larger surface area, which facilitates the uptake of potassium ions and water into the cells. This influx of ions and water causes the guard cells to swell and bend, leading to the opening of the stomatal pore.
The narrow waist or isthmus region of the guard cells acts as a hinge, allowing the lobes to move independently. This flexibility enables the guard cells to change shape and control the size of the stomatal pore based on environmental conditions such as light intensity, humidity, and carbon dioxide levels.
Conclusion:
In conclusion, the shape of guard cells in grasses is dumb-bell-shaped, with two rounded lobes connected by a narrow waist. This shape allows for efficient control of stomatal opening and closing, which is essential for regulating gas exchange and water loss in plants.
Ground tissue consists of- a)All tissues external to endodermis
- b)All tissues except epidermis and vascular tissue
- c)All tissues internal to endodermis
- d)Epidermis and cortex
Correct answer is option 'B'. Can you explain this answer?
Ground tissue consists of
a)
All tissues external to endodermis
b)
All tissues except epidermis and vascular tissue
c)
All tissues internal to endodermis
d)
Epidermis and cortex
|
Sarthak Saini answered |
Ground tissue consists of all tissues except epidermis and vascular bundle of stem and root. It forms the main parts of plant made up of
Select the incorrect statement regarding the anatomy of a typical monocotyledonous stem.- a)Phloem parenchyma is absent.
- b)Vascular bundles are scattered, conjoint, collateral and closed.
- c)Each vascular bundle is surrounded by a bundle sheath.
- d)Ground tissue is differentiated into cortex, endodermis, pericyde and pith
Correct answer is option 'D'. Can you explain this answer?
Select the incorrect statement regarding the anatomy of a typical monocotyledonous stem.
a)
Phloem parenchyma is absent.
b)
Vascular bundles are scattered, conjoint, collateral and closed.
c)
Each vascular bundle is surrounded by a bundle sheath.
d)
Ground tissue is differentiated into cortex, endodermis, pericyde and pith
|
|
Meghana Datta answered |
Incorrect Statement Explanation
The anatomy of a typical monocotyledonous stem has distinct characteristics that differentiate it from dicotyledonous stems. The statement in option 'D' is incorrect because of the following reasons:
Ground Tissue Composition
- In monocots, the ground tissue does not differentiate into distinct regions like cortex, endodermis, pericycle, and pith.
- Instead, the ground tissue is generally homogeneous and lacks the specialized structures found in dicots.
Vascular Bundle Arrangement
- Monocots have scattered vascular bundles throughout the stem, which is a key feature.
- Each vascular bundle is composed of xylem and phloem, arranged in a conjoint, collateral, and closed manner.
Bundle Sheath Presence
- Each vascular bundle is surrounded by a bundle sheath, which is a layer of cells that can help in the transport and support of the vascular tissue.
Absence of Phloem Parenchyma
- In monocots, phloem parenchyma is typically absent, which is another distinguishing feature when compared to dicots.
In summary, the ground tissue in monocot stems lacks the differentiation into cortex, endodermis, pericycle, and pith, making option 'D' the incorrect statement regarding the anatomy of a typical monocotyledonous stem.
The anatomy of a typical monocotyledonous stem has distinct characteristics that differentiate it from dicotyledonous stems. The statement in option 'D' is incorrect because of the following reasons:
Ground Tissue Composition
- In monocots, the ground tissue does not differentiate into distinct regions like cortex, endodermis, pericycle, and pith.
- Instead, the ground tissue is generally homogeneous and lacks the specialized structures found in dicots.
Vascular Bundle Arrangement
- Monocots have scattered vascular bundles throughout the stem, which is a key feature.
- Each vascular bundle is composed of xylem and phloem, arranged in a conjoint, collateral, and closed manner.
Bundle Sheath Presence
- Each vascular bundle is surrounded by a bundle sheath, which is a layer of cells that can help in the transport and support of the vascular tissue.
Absence of Phloem Parenchyma
- In monocots, phloem parenchyma is typically absent, which is another distinguishing feature when compared to dicots.
In summary, the ground tissue in monocot stems lacks the differentiation into cortex, endodermis, pericycle, and pith, making option 'D' the incorrect statement regarding the anatomy of a typical monocotyledonous stem.
Which among the following is incorrect about Parenchyma?- a)The packing tissues in plants that stores food, nutrients and water are called Parenchyma
- b)Parenchyma with chlorophyll is called chlorenchyma and parenchyma with air is called aerenchyma
- c)The intercellular gaps in Parenchyma are negligible
- d)Aerenchyma is mostly present in aquatic plants and chlorenchyma is present in leaves
Correct answer is option 'C'. Can you explain this answer?
Which among the following is incorrect about Parenchyma?
a)
The packing tissues in plants that stores food, nutrients and water are called Parenchyma
b)
Parenchyma with chlorophyll is called chlorenchyma and parenchyma with air is called aerenchyma
c)
The intercellular gaps in Parenchyma are negligible
d)
Aerenchyma is mostly present in aquatic plants and chlorenchyma is present in leaves
|
EduRev NEET answered |
- The packing tissues in plants that stores food, nutrients and water are called Parenchyma.
- Parenchyma with chlorophyll is called chlorenchyma and parenchyma with air is called aerenchyma.
- The intercellular gaps in Parenchyma are large.
- Aerenchyma is mostly present in aquatic plants and chlorenchyma is present in leaves.
Vessels and companion cells are respectively present in the xylem and phloem of- a)Gymnosperm
- b)Pteridophytes
- c)Angiosperm
- d)Bryophyta
Correct answer is option 'C'. Can you explain this answer?
Vessels and companion cells are respectively present in the xylem and phloem of
a)
Gymnosperm
b)
Pteridophytes
c)
Angiosperm
d)
Bryophyta
|
|
Abhishek Desai answered |
Phloem elements do typically have sieve plates instead of final walls. Sieve-tube members of angiosperms are associated by living companion cells. The phloem is the principal food-conducting tissue of vascular plants. Its elements are elongated, just like those of the xylem.
Which plant part possesses polyarch condition of vascular bundles with a well developed pith?- a)Dicot root
- b)Monocot root
- c)Dicot stem
- d)Monocot stem
Correct answer is option 'B'. Can you explain this answer?
Which plant part possesses polyarch condition of vascular bundles with a well developed pith?
a)
Dicot root
b)
Monocot root
c)
Dicot stem
d)
Monocot stem
|
|
Anjali Sharma answered |
vascular bundles in monocot roots are radial, polyarch and exarch. Large number (more than 6) of xylem and phloem groups alternate with each other. A well devloped pith is present in monocot root.
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