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All questions of Anatomy of Flowering Plants for ACT 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
Grafting is successful in dicots but not in monocots because the dicots have- a)Vascular bundles arranged in a ring
- b)Vessels with elements arranged end to end
- c)Cambium for secondary growth
- d)Cork cambium
Correct answer is option 'C'. Can you explain this answer?
Grafting is successful in dicots but not in monocots because the dicots have
a)
Vascular bundles arranged in a ring
b)
Vessels with elements arranged end to end
c)
Cambium for secondary growth
d)
Cork cambium
|
Anjali Iyer answered |
In grafting technique, two parts of two related plants are joined, so as to form composite plant. In this, one plant having strong root system, is called stock while the other having better shoot, is called scion or graft. The grafting technique is successful in two related plants having vascular cambium (characteristic feature of dicotyledons). Later is absent in monocotyledons, so grafting cannot possible in monocots.
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.
|
Rohan Singh 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.
Meristem, region of cells capable of division and growth in plants. Meristem cells are typically small cells the diameters of which in different directions are about equal. They have a dense cytoplasm and relatively few small vacuoles (watery saclike enclosures).
Meristems are classified by their location in the plant 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, especially of certain monocotyledons—e.g., grasses). Apical meristems are also known as primary meristems because they give rise to the primary plant body. Lateral meristems are secondary meristems because they are responsible for secondary growth, or increase in stem girth and thickness. Meristems form anew from other cells in injured tissues and are responsible for wound healing.
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.
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.
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.
The secondary meristem originates froma)Promeristemb)Permanent tissuec)Primary meristemd)Secretory tissueCorrect answer is option 'B'. Can you explain this answer?
|
|
Riya Banerjee answered |
The primary meristem is derived directly from embryonic cells. The secondary meristem is also responsible for giving rise to cells that differentiate into the secondary permanent tissues of the plant, e.g. phellem. An example of a secondary meristem is the lateral meristem (e.g. cork cambium and accessory cambia).
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 tissue remains more active during autumn
- a)Vascular cambium
- b)Cork cambium
- c)Parenchyma
- d)Sclerenchyma
Correct answer is option 'B'. Can you explain this answer?
Which tissue remains more active during autumn
a)
Vascular cambium
b)
Cork cambium
c)
Parenchyma
d)
Sclerenchyma
|
|
Ananya Das answered |
The highest activity of cork cambium is in winter (Autumn) season. Ring of cork cambium remains living only for one year. Each year, a new cambium is formed below the previous cambium. This new cambium is derived from the secondary cortex or phelloderm.
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
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.
In grasses, certain adaxial epidermal cells along the veins modify themselves into large empty, colourless cells called- a)Guard cells
- b)Subsidiary cells
- c)Companion cells
- d)Bulliform cells
Correct answer is option 'D'. Can you explain this answer?
In grasses, certain adaxial epidermal cells along the veins modify themselves into large empty, colourless cells called
a)
Guard cells
b)
Subsidiary cells
c)
Companion cells
d)
Bulliform cells
|
|
Anjali Iyer answered |
In grasses, certain adaxial epidermal cells along the veins modify themselves into large, empty, colourless cells. These are called bulliform cells or motor cells. Bulliform cells help in folding and unfolding of grass leaves.
When the bulliform cells in the leaves have absorbed water and are turgid, the leaf surface is exposed. When they are flaccid due to water stress, they make the leaves curl inwards (inrolling) to minimise water loss (transpiration).
A meristematic region present between the xylem and the phloem of open vascular bundles is called- a)Pericycle
- b)Pith
- c)Intrafascicular cambium
- d)Medullary ray
Correct answer is option 'C'. Can you explain this answer?
A meristematic region present between the xylem and the phloem of open vascular bundles is called
a)
Pericycle
b)
Pith
c)
Intrafascicular cambium
d)
Medullary ray
|
|
Pooja Shah answered |
Intrafascicular cambium is present between xylem and phloem in dicot stem and roots. It is also termed as fascicular cambium. This meristematic area spreads laterally from each bundle and eventually becomes continuous, forming a complete vascular cambium.
Growth rings are formed due to the activity of- a)Intrastelar Cambium
- b)Intercalary Cambium
- c)Extrastelar cambium
- d)Primary cambium
Correct answer is option 'A'. Can you explain this answer?
Growth rings are formed due to the activity of
a)
Intrastelar Cambium
b)
Intercalary Cambium
c)
Extrastelar cambium
d)
Primary cambium
|
|
Anjali Iyer answered |
As we know that Intrafascicular/intrastelar cambium is present between xylem and phloem in dicot stem and roots. Pith rays, present between the edges of intrafascicular cambium, divide to form a new cambium strip between the two vascular bundle i.e. interfascicular cambium. Thus, inter and intra fascicular cambium together forms a complete cambium ring, called as vascular cambium, which forms secondary xylem on inner side and secondary phloem on outer side. Differential cambial activity during autumn and spring season result in narrow and wide secondary xylem rings respectively, which together forms the annual growth ring. Thus, annual growth ring is derived from vascular cambium, which is derived from inter and intrastelar cambium.
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).
Conjoint and closed vascular bundles with no phloem parenchyma may be observed in- a)Monocot root
- b)Monocot stem
- c)Dicot root
- d)Dicot stem
Correct answer is option 'B'. Can you explain this answer?
Conjoint and closed vascular bundles with no phloem parenchyma may be observed in
a)
Monocot root
b)
Monocot stem
c)
Dicot root
d)
Dicot stem
|
|
꧁༒gundagi༒꧂ ꧁༒विरेश༒꧂ answered |
Conjoint and closed vascular bundles with no phloem parenchyma may be observed in monocot stem. Open vascular bundles have cambium and the possibility of further xylem and phloem. There is no cambium in closed vascular bundles.
Living tissue in lenticel is called- a)Conjunctive tissue
- b)Connective tissue
- c)Complementary tissue
- d)Phelloderm
Correct answer is option 'C'. Can you explain this answer?
Living tissue in lenticel is called
a)
Conjunctive tissue
b)
Connective tissue
c)
Complementary tissue
d)
Phelloderm
|
|
Pooja Shah answered |
A lenticel is a porous tissue consisting of cells with large intercellular spaces in the periderm of the secondarily thickened organs and the bark of woody stems and roots of dicotyledonous flowering plants. It functions as a pore, providing a pathway for the direct exchange of gases between the internal tissues and atmosphere through the bark, which is otherwise impermeable to gases.
As the lenticels formation starts, the parenchyma cells found near substomatal cavity lose their chlorophyll content and irregularly divide in different plants giving rise to a mass of colourless, rounded, thin walled, loosely arranged cells, called as complementary cells. Sometimes, complementary cells produced by phellogen towards outside instead of producing cork cells. Complementary cells are living cells in lenticles. Conjunctive tissue, connective tissue and phelloderm are not the living tissue in lenticel
As the lenticels formation starts, the parenchyma cells found near substomatal cavity lose their chlorophyll content and irregularly divide in different plants giving rise to a mass of colourless, rounded, thin walled, loosely arranged cells, called as complementary cells. Sometimes, complementary cells produced by phellogen towards outside instead of producing cork cells. Complementary cells are living cells in lenticles. Conjunctive tissue, connective tissue and phelloderm are not the living tissue in lenticel
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.
The lateral roots originate from- a)Endodermis cells
- b)Cortical cells below root hair
- c)Pericycle cells
- d)Epiblema
Correct answer is option 'C'. Can you explain this answer?
The lateral roots originate from
a)
Endodermis cells
b)
Cortical cells below root hair
c)
Pericycle cells
d)
Epiblema
|
|
Rohan Singh answered |
Lateral roots start to develop in the pericycle cells, which is the outermost cell layer in the vascular cylinder. Remember that the xylem and phloem make up the vascular cylinder and that it is found in the center of the root.
Water conduction in stem of tree takes place by- a)Duramen
- b)Sapwood
- c)Primary xylem
- d)All the above
Correct answer is option 'B'. Can you explain this answer?
Water conduction in stem of tree takes place by
a)
Duramen
b)
Sapwood
c)
Primary xylem
d)
All the above
|
Om Desai answered |
Sapwood is the younger, outermost wood in the growing tree. It is living wood and its principal functions are to conduct water from the roots to the leaves and to store up and give back according to the season the reserves prepared in the leaves. However, by the time they become competent to conduct water, all xylem tracheids and vessels have lost their cytoplasm and the cells are therefore functionally dead. All wood in a tree is first formed as sapwood. The more leaves a tree bears and the more vigorous its growth, the larger the volume of sapwood required.
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
Casparian thickenings are found in the cells of- a)Endodermis of the root
- b)Pericycle of the root
- c)Endodermis of the stem
- d)Pericycle of the stem
Correct answer is option 'A'. Can you explain this answer?
Casparian thickenings are found in the cells of
a)
Endodermis of the root
b)
Pericycle of the root
c)
Endodermis of the stem
d)
Pericycle of the stem
|
|
Pooja Mehta answered |
In plant anatomy, the Casparian strip is a band of cell wall material deposited in the radial and tranverse walls of the endodermis, and is chemically different from the rest of the cell wall - the cell wall being made of lignin and without suberin - whereas the Casparian strip is made of suberin and sometimes lignin.
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.
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
|
Shubhangi Arohee answered |
The structure of parenchyma does not have thickened cell walls.... while collenchyma n schlerenchyma have depositions.
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.
Diffuse porous woods are characteristic of plants growing in- a)alpine region
- b)cold winter regions
- c)temperature climate
- d)tropics
Correct answer is option 'D'. Can you explain this answer?
Diffuse porous woods are characteristic of plants growing in
a)
alpine region
b)
cold winter regions
c)
temperature climate
d)
tropics
|
|
Rajat Kapoor answered |
Tropics. In most of the gymnosperms, like conifers and cycads, vessels are absent and the timber is made totally of tracheids. Such wood is known as nonporous.
Bark includes all the tissues- a)Lying outside the vascular cambium
- b)Formed by vascular cambium
- c)Formed by phellogen
- d)Phellem & phelloderm
Correct answer is option 'A'. Can you explain this answer?
Bark includes all the tissues
a)
Lying outside the vascular cambium
b)
Formed by vascular cambium
c)
Formed by phellogen
d)
Phellem & phelloderm
|
|
Raghav Bansal answered |
Bark is the outermost layers of stems and roots of woody plants. Plants with bark include trees, woody vines and shrubs. Bark refers to all the tissues outside of the vascular cambium and is a non-technical term. It overlays the wood and consists of the inner bark and the outer bark. The inner bark, which in older stems is living tissue, includes the innermost area of the periderm.
The outer bark in older stems includes the dead tissue on the surface of the stems, along with parts of the innermost periderm and all the tissues on the outer side of the periderm. The outer bark on trees which lies external to the last formed periderm is also called as the rhytidome. So, bark includes the tissue lying outside the vascular cambium and not of formed by vascular cambium, formed by phellogen and phellem and phelloderm.
Thus, the correct answer is option A.
The outer bark in older stems includes the dead tissue on the surface of the stems, along with parts of the innermost periderm and all the tissues on the outer side of the periderm. The outer bark on trees which lies external to the last formed periderm is also called as the rhytidome. So, bark includes the tissue lying outside the vascular cambium and not of formed by vascular cambium, formed by phellogen and phellem and phelloderm.
Thus, the correct answer is option A.
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.
In a woody dicotyledonous tree, which of the following parts will mainly consist of primary tissues?
- a)all parts
- b)stem and root
- c)shoot tips and root tips.
- d)flowers, fruits and leaves
Correct answer is option 'C'. Can you explain this answer?
In a woody dicotyledonous tree, which of the following parts will mainly consist of primary tissues?
a)
all parts
b)
stem and root
c)
shoot tips and root tips.
d)
flowers, fruits and leaves
|
|
Anjali Iyer answered |
In a woody dicotyledonous tree, the meristems which occur at tips of roots and shoots produce primary tissues and are called apical meristems.
So, the correct answer is 'Shoot tips and Root tips'.
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.
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.
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.
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.
In trees, the growth rings represent- a)Primary xylem
- b)Secondary xylem
- c)Secondary phloem
- d)Cambium
Correct answer is option 'B'. Can you explain this answer?
In trees, the growth rings represent
a)
Primary xylem
b)
Secondary xylem
c)
Secondary phloem
d)
Cambium
|
|
Anjali Iyer answered |
Trees have two types of growth: primary growth and secondary growth. ... Cambium lies between the old wood and the bark of the tree. The vascular cambium is a thin layer cells that produces conducting cells – xylem and phloem.
If a stem is girdled- a)Root dies first
- b)Shoot dies first
- c)Both die together
- d)None of the above die
Correct answer is option 'A'. Can you explain this answer?
If a stem is girdled
a)
Root dies first
b)
Shoot dies first
c)
Both die together
d)
None of the above die
|
|
Aruna Devi answered |
If the stem is girdled, the roots of the plant will not able to capture food and die first.
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.
Angular collenchyma occurs in- a)Datura
- b)Helianthus
- c)Althea
- d)Cucurbita
Correct answer is option 'B'. Can you explain this answer?
Angular collenchyma occurs in
a)
Datura
b)
Helianthus
c)
Althea
d)
Cucurbita
|
|
Ananya Das answered |
Collenchyma is a type of plant tissue in which cells are elongated in shape with the irregularly thickened primary cell wall. It provides mechanical support to the plant.
Collenchymatous cells are present at the periphery of herbaceous stems, petioles and the ribs of some leaves. They are also present in floral parts, fruits and aerial roots.,
Collenchyma develops from the ground meristem or procambium.
Types of collenchyma are
(a) Angular: The thickening materials deposit at the angles or corners of the cells where several cells meet e.g., petioles of Cucurbita, beta etc.
(b) Lamellar: The thickening material deposits heavily on the tangential walls of the cell than the radial walls e.g. stem of Sambucus.
(c )Lacunar : The thickening material deposits at those places of the cell wall which are in direct contact with the intercellular spaces. e,g, petioles of Salvia, Malva.
(d) Annular: In this type, the cell lumen more or less appears to be circular. This is mature tissue where cell shape changes with heavy deposits of pectin and hemicellulose in walls.
Thus, the correct answer is option D.
External Protective tissues are- a)Cortex and epidermis
- b)Cork and pericycle
- c)Cortex and pericycle
- d)Cork and epidermis
Correct answer is option 'D'. Can you explain this answer?
External Protective tissues are
a)
Cortex and epidermis
b)
Cork and pericycle
c)
Cortex and pericycle
d)
Cork and epidermis
|
Akshat Chavan answered |
Answer: As the plants grow older, the outer protective tissue (i.e., epidermis) undergoes certain changes. A strip of secondary moisten, called halogen or cork cambium replaces the epidermis of the stem.It's cells prevent desiccation (loss of water from plant body), infection and mechanical injury.
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.
Stem of date palm increases in girth due to activity of- a)Intercalary meristem
- b)Apical meristem
- c) Lateral meristem
- d)None of the above
Correct answer is option 'B'. Can you explain this answer?
Stem of date palm increases in girth due to activity of
a)
Intercalary meristem
b)
Apical meristem
c)
Lateral meristem
d)
None of the above
|
|
Rajeev Saxena answered |
The stem of date palm increases in girth due to the activity of apical meristem and not because of intercalary meristem and lateral meristem (involves is the normal secondary growth of dicots). Thus, option B is correct.
The only plant cells without nuclei among the following are
- a)Cambium cells
- b)Cells of pericycle
- c)Xylem parenchyma
- d)Sieve tubes
Correct answer is option 'D'. Can you explain this answer?
The only plant cells without nuclei among the following are
a)
Cambium cells
b)
Cells of pericycle
c)
Xylem parenchyma
d)
Sieve tubes
|
|
Manisha Sarkar answered |
The correct answer is option 'D', which states that the only plant cells without nuclei among the given options are sieve tubes. Let's understand why this is the correct answer.
Plant Cells and Nuclei:
Plant cells are the fundamental units of plants and possess various specialized structures that perform specific functions. One of the essential organelles found in plant cells is the nucleus. The nucleus is a membrane-bound organelle that contains the genetic material of the cell, including DNA and RNA. It plays a crucial role in regulating the activities of the cell, including protein synthesis, cell division, and gene expression.
Explanation of the Options:
a) Cambium Cells:
Cambium cells are meristematic cells found in the stem and root of a plant. They are responsible for secondary growth, which leads to an increase in the diameter of the stem or root. Cambium cells actively divide and differentiate into secondary xylem and phloem cells. These cells contain nuclei as they are actively involved in cellular processes.
b) Cells of Pericycle:
The pericycle is a layer of cells located just inside the endodermis in the root. It is responsible for lateral root formation and the initiation of secondary growth. The cells of the pericycle also contain nuclei, as they actively participate in various cellular processes such as cell division and differentiation.
c) Xylem Parenchyma:
Xylem parenchyma cells are a type of parenchyma cells found in the xylem tissue of plants. They are involved in storage and transportation of water and minerals. Xylem parenchyma cells, like other plant cells, contain nuclei. The nuclei are essential for the regulation of cellular activities and the synthesis of proteins and enzymes required for cell function.
d) Sieve Tubes:
Sieve tubes are specialized cells found in the phloem tissue of plants. They are responsible for the transport of organic substances, such as sugars, from the leaves to other parts of the plant. Sieve tubes are unique in that they lack nuclei at maturity. During their development, the sieve tube elements lose their nuclei, allowing for a more efficient flow of materials through the phloem. The absence of nuclei in sieve tubes is an adaptation to facilitate the rapid and uninterrupted transport of organic solutes.
Conclusion:
Among the given options, sieve tubes are the only plant cells without nuclei. The absence of nuclei in sieve tubes allows for more efficient movement of organic substances through the phloem. The other options - cambium cells, cells of pericycle, and xylem parenchyma cells - all contain nuclei, which are essential for their cellular functions.
Plant Cells and Nuclei:
Plant cells are the fundamental units of plants and possess various specialized structures that perform specific functions. One of the essential organelles found in plant cells is the nucleus. The nucleus is a membrane-bound organelle that contains the genetic material of the cell, including DNA and RNA. It plays a crucial role in regulating the activities of the cell, including protein synthesis, cell division, and gene expression.
Explanation of the Options:
a) Cambium Cells:
Cambium cells are meristematic cells found in the stem and root of a plant. They are responsible for secondary growth, which leads to an increase in the diameter of the stem or root. Cambium cells actively divide and differentiate into secondary xylem and phloem cells. These cells contain nuclei as they are actively involved in cellular processes.
b) Cells of Pericycle:
The pericycle is a layer of cells located just inside the endodermis in the root. It is responsible for lateral root formation and the initiation of secondary growth. The cells of the pericycle also contain nuclei, as they actively participate in various cellular processes such as cell division and differentiation.
c) Xylem Parenchyma:
Xylem parenchyma cells are a type of parenchyma cells found in the xylem tissue of plants. They are involved in storage and transportation of water and minerals. Xylem parenchyma cells, like other plant cells, contain nuclei. The nuclei are essential for the regulation of cellular activities and the synthesis of proteins and enzymes required for cell function.
d) Sieve Tubes:
Sieve tubes are specialized cells found in the phloem tissue of plants. They are responsible for the transport of organic substances, such as sugars, from the leaves to other parts of the plant. Sieve tubes are unique in that they lack nuclei at maturity. During their development, the sieve tube elements lose their nuclei, allowing for a more efficient flow of materials through the phloem. The absence of nuclei in sieve tubes is an adaptation to facilitate the rapid and uninterrupted transport of organic solutes.
Conclusion:
Among the given options, sieve tubes are the only plant cells without nuclei. The absence of nuclei in sieve tubes allows for more efficient movement of organic substances through the phloem. The other options - cambium cells, cells of pericycle, and xylem parenchyma cells - all contain nuclei, which are essential for their cellular functions.
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.
Sap wood is- a)Inner part of secondary phloem
- b)Outer part of secondary phloem
- c)Both of these
- d)None of these
Correct answer is option 'D'. Can you explain this answer?
Sap wood is
a)
Inner part of secondary phloem
b)
Outer part of secondary phloem
c)
Both of these
d)
None of these
|
|
Rahul answered |
Sapwood is the outer layer of a branch or limb that is still living. It is usually lighter in color and is very moist. Sapwood is the living part of a tree where the sap and water flow. So, option D is right.
Annual rings and growth rings are formed due to the fluctuations in the activity of- a)xylem
- b)phloem
- c)xylem and phloem
- d)cambium
Correct answer is option 'D'. Can you explain this answer?
Annual rings and growth rings are formed due to the fluctuations in the activity of
a)
xylem
b)
phloem
c)
xylem and phloem
d)
cambium
|
|
Rohan Singh answered |
Due to differential seasonal activity of cambium,alternate light & dense wood is cut off leading to formation of annual rings.
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
|
Sagarika Bajaj answered |
Aerating pores in the bark of plants are known as Lenticels.
Lenticels are small openings or pores found on the stems, branches, and sometimes on the fruits of woody plants. They are responsible for the exchange of gases between the internal tissues of the plant and the external environment. Lenticels allow the plant to take in oxygen and release carbon dioxide, thus facilitating respiration in the bark.
Here is a detailed explanation of lenticels:
1. What are lenticels?
- Lenticels are specialized pores or openings found on the surface of the bark of woody plants.
- They are usually oval or elongated in shape and appear as small raised areas on the bark.
- Lenticels can vary in size and color depending on the plant species.
2. Function of lenticels:
- Lenticels play a crucial role in the exchange of gases, particularly oxygen and carbon dioxide, between the plant's internal tissues and the external environment.
- They allow oxygen to enter the inner bark layers, where it is utilized for cellular respiration.
- Carbon dioxide produced during respiration is released through the lenticels into the atmosphere.
- Lenticels also help in the elimination of excess water vapor from the plant's tissues.
3. Structure of lenticels:
- Lenticels consist of loosely arranged cells with air spaces in between.
- These air spaces allow the diffusion of gases.
- The outer layers of the lenticel are formed by cork cells, while the inner layers contain living cells.
4. Importance of lenticels:
- Lenticels are vital for the survival and growth of woody plants.
- In the absence of lenticels, the bark would become impermeable to gases, leading to the death of underlying tissues.
- They ensure proper gas exchange, maintaining the balance of oxygen and carbon dioxide in the plant's tissues.
- Lenticels also serve as a pathway for the release of excess water vapor, preventing waterlogging and potential damage to the bark.
In conclusion, lenticels are the aerating pores found on the bark of woody plants. They enable the exchange of gases, such as oxygen and carbon dioxide, between the internal tissues of the plant and the external environment. Lenticels are essential for plant respiration and the overall health of woody plants.
Lenticels are small openings or pores found on the stems, branches, and sometimes on the fruits of woody plants. They are responsible for the exchange of gases between the internal tissues of the plant and the external environment. Lenticels allow the plant to take in oxygen and release carbon dioxide, thus facilitating respiration in the bark.
Here is a detailed explanation of lenticels:
1. What are lenticels?
- Lenticels are specialized pores or openings found on the surface of the bark of woody plants.
- They are usually oval or elongated in shape and appear as small raised areas on the bark.
- Lenticels can vary in size and color depending on the plant species.
2. Function of lenticels:
- Lenticels play a crucial role in the exchange of gases, particularly oxygen and carbon dioxide, between the plant's internal tissues and the external environment.
- They allow oxygen to enter the inner bark layers, where it is utilized for cellular respiration.
- Carbon dioxide produced during respiration is released through the lenticels into the atmosphere.
- Lenticels also help in the elimination of excess water vapor from the plant's tissues.
3. Structure of lenticels:
- Lenticels consist of loosely arranged cells with air spaces in between.
- These air spaces allow the diffusion of gases.
- The outer layers of the lenticel are formed by cork cells, while the inner layers contain living cells.
4. Importance of lenticels:
- Lenticels are vital for the survival and growth of woody plants.
- In the absence of lenticels, the bark would become impermeable to gases, leading to the death of underlying tissues.
- They ensure proper gas exchange, maintaining the balance of oxygen and carbon dioxide in the plant's tissues.
- Lenticels also serve as a pathway for the release of excess water vapor, preventing waterlogging and potential damage to the bark.
In conclusion, lenticels are the aerating pores found on the bark of woody plants. They enable the exchange of gases, such as oxygen and carbon dioxide, between the internal tissues of the plant and the external environment. Lenticels are essential for plant respiration and the overall health of woody plants.
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