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All questions of Anatomy of Flowering Plants for NEET Exam
Main function of lenticel is[2002]- a)transpiration
- b)guttation
- c)gaseous exchange
- d)bleeding
Correct answer is option 'A'. Can you explain this answer?
Main function of lenticel is
[2002]
a)
transpiration
b)
guttation
c)
gaseous exchange
d)
bleeding
|
Shivani Tiwari answered |
Lenticels are pores present in woody stem through which transpiration or loss of water vapour takes place. Lenticel formation begins during the development of the first periderm. In the stem, they usually appear below a stoma or group of stomata. It should also be noted that lenticels can be present on fruits such as apples and pears.
Which one of the following is wrongly matched?[2011]- a)Root pressure - Guttation
- b)Puccinia - Smut
- c)Root - Exarch protoxylem
- d)Cassia - Imbricate aestivation
Correct answer is option 'B'. Can you explain this answer?
Which one of the following is wrongly matched?
[2011]
a)
Root pressure - Guttation
b)
Puccinia - Smut
c)
Root - Exarch protoxylem
d)
Cassia - Imbricate aestivation
|
Prisha Singh answered |
Smut is a disease of cereals, corn, grasses and sorghum caused by many species of fungi.
Ectophloic siphonostele is found in- a)Osmunda and Equisetum
- b)Marsilea and Botrychium
- c)Adiantum and Cucurbitaceae
- d)Dicksonia and Maidenhair fern
Correct answer is option 'A'. Can you explain this answer?
Ectophloic siphonostele is found in
a)
Osmunda and Equisetum
b)
Marsilea and Botrychium
c)
Adiantum and Cucurbitaceae
d)
Dicksonia and Maidenhair fern
|
Pooja Saha answered |
The central pith is surrounded by xylem, phloem, pericycle and endodermis . The phloem occurs only outside the xylem e.g Equisetum, Osmunda.
As the secondary growth takes place (proceeds) in a tree, thickness of [1994]- a)heart wood increases
- b)sap-wood increases
- c)both increase
- d)both remain the same
Correct answer is option 'A'. Can you explain this answer?
As the secondary growth takes place (proceeds) in a tree, thickness of
[1994]
a)
heart wood increases
b)
sap-wood increases
c)
both increase
d)
both remain the same
|
Dipika Das answered |
Heartwood is the central wood of mature dicot stem and is the nonfunctional part of secondary xylem.
In a woody dicotyledonous tree, which of the following parts will mainly consist of primary tissues?[2005]- a)Shoot tips and root tips
- b)Stem and root
- c)Flowers, fruits and leaves
- d)All parts
Correct answer is option 'A'. Can you explain this answer?
In a woody dicotyledonous tree, which of the following parts will mainly consist of primary tissues?
[2005]
a)
Shoot tips and root tips
b)
Stem and root
c)
Flowers, fruits and leaves
d)
All parts
|
Shanaya Rane answered |
Primary Meristems : They are those meristematic tissues which are dervied directly from the meristems of the embryo and retain their meristematic activity. They are present at root, shoot tip and leaf primordia.
Reduction in vascular tissue, mechanical tissue and cuticle is characteristic of: [2009]- a)mesophytes
- b)epiphytes
- c)hydrophytes
- d)xerophytes
Correct answer is option 'C'. Can you explain this answer?
Reduction in vascular tissue, mechanical tissue and cuticle is characteristic of:
[2009]
a)
mesophytes
b)
epiphytes
c)
hydrophytes
d)
xerophytes
|
|
Prisha Singh answered |
Reduction in vascular tissue, mechanical tissue and cuticle is characteristic of hydrophytes.
In Kranz anatomy, the bundle sheath cells have[2011M]- a)thin walls, many intercellular spaces and no chloroplasts
- b)thick walls, no intercellular spaces and large number of chloroplasts
- c)thin walls, no intercellular spaces and several chloroplasts
- d)thick walls, many intercellular spaces and few chloroplasts
Correct answer is option 'B'. Can you explain this answer?
In Kranz anatomy, the bundle sheath cells have
[2011M]
a)
thin walls, many intercellular spaces and no chloroplasts
b)
thick walls, no intercellular spaces and large number of chloroplasts
c)
thin walls, no intercellular spaces and several chloroplasts
d)
thick walls, many intercellular spaces and few chloroplasts
|
Naveen Menon answered |
In Kranz anatomy, the bundle sheath cells have thick wall, no intracellular spaces and large number of chloroplasts.
Gymnosperms are also called soft wood spermatophytes because they lack :[2012]- a)Cambium
- b)Phloem fibres
- c)Thick-walled tracheids
- d)Xylem fibres
Correct answer is option 'D'. Can you explain this answer?
Gymnosperms are also called soft wood spermatophytes because they lack :
[2012]
a)
Cambium
b)
Phloem fibres
c)
Thick-walled tracheids
d)
Xylem fibres
|
|
Shivani Tiwari answered |
Gymnosperms lack xylem fibres. Large amount of parenchymatous cells are present with secondary xylem tracheids. So, these are also known as softwood spermatophytes.
Procambium forms[1994]- a)only primary vascular bundles
- b)only vascular cambium
- c)only cork cambium
- d)primary vascular bundles and vascular cambium
Correct answer is option 'A'. Can you explain this answer?
Procambium forms
[1994]
a)
only primary vascular bundles
b)
only vascular cambium
c)
only cork cambium
d)
primary vascular bundles and vascular cambium
|
|
Shivani Tiwari answered |
Procambium is the derivative of shoot apical meristem and forms vascular strand.
For a critical study of secondary growth in plants. Which one of the following pairs is suitable?[2007]- a)teak and pine
- b)deodar and fern
- c)wheat and maiden hair fern
- d)sugarcane and sunflower.
Correct answer is option 'A'. Can you explain this answer?
For a critical study of secondary growth in plants. Which one of the following pairs is suitable?
[2007]
a)
teak and pine
b)
deodar and fern
c)
wheat and maiden hair fern
d)
sugarcane and sunflower.
|
Aman Sharma answered |
Teak and pine is most suitable for the study of critical secondary growth because in secondary growth, secondary tissues are formed from lateral meristem which is well developed in these two cases and secondary growth occurs in gymnosperms and dicots.
The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is: [2009]
- a)elongating
- b)widening
- c)differentiating
- d)maturing
Correct answer is option 'D'. Can you explain this answer?
The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is: [2009]
a)
elongating
b)
widening
c)
differentiating
d)
maturing
|
Arindam Khanna answered |
The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is maturing.This is the time when protoxylem develops or produces annular and spiral thick carrier elements. They also grow plants to provide mechanical support.
The length of different internodes in a culm of sugarcane is variable because of[2008]- a)shoot apical meristem
- b)position of axillary buds
- c)size of leaf lamina at the node below each internode
- d)intercalary meristem
Correct answer is option 'D'. Can you explain this answer?
The length of different internodes in a culm of sugarcane is variable because of
[2008]
a)
shoot apical meristem
b)
position of axillary buds
c)
size of leaf lamina at the node below each internode
d)
intercalary meristem
|
Dipanjan Mehta answered |
The length of different internodes in a culm of sugarcane is variable because of intercalary meristem. Intercalary meristem is not a part of apical meristem, occurs in the internodes of grasses (sugarcane) between leaf nodes and enables longitudinal growth of the stem.
Vascular tissues in flowering plants develop from:[2008]- a)phellogen
- b)plerome
- c)periblem
- d)dermatogen
Correct answer is option 'B'. Can you explain this answer?
Vascular tissues in flowering plants develop from:
[2008]
a)
phellogen
b)
plerome
c)
periblem
d)
dermatogen
|
Sushant Goyal answered |
Vascular tissues in flowering plants develop from plerome. Plerome is a central core of primary meristem which gives rise to all cells of the stele from the pericycle inward.
As compared to a dicot root, a monocot root has[2012M]- a)many xylem bundles.
- b)relatively thicker periderm.
- c)inconspicuous annual rings.
- d)more abundant secondary xylem.
Correct answer is option 'A'. Can you explain this answer?
As compared to a dicot root, a monocot root has
[2012M]
a)
many xylem bundles.
b)
relatively thicker periderm.
c)
inconspicuous annual rings.
d)
more abundant secondary xylem.
|
|
Prisha Singh answered |
The vascular bundles are arranged in a loose circle inside the endodermis of a monocot root. In a monocot root, more than six vascular bundles are present. It shows polyarch condition.
In land plants, the guard cells differ from other epidermal cells in having :[2011]- a)cytoskeleton
- b)mitochondria
- c)endoplasmic reticulum
- d)chloroplasts
Correct answer is option 'D'. Can you explain this answer?
In land plants, the guard cells differ from other epidermal cells in having :
[2011]
a)
cytoskeleton
b)
mitochondria
c)
endoplasmic reticulum
d)
chloroplasts
|
Sarthak Saini answered |
Guard cells differ from epidermal cells in having chloroplast. The cell wall of guard cells are not uniform, inner walls are thicker than the outer walls, epidermal cells are uniformly thin.
What is not true about sclereids?[1996]- a)These are parenchyma cells with thickened lignified walls
- b)These are elongated and flexible with tapered ends
- c)These are commonly found in the shells of nuts and in the pulp of guava, pear, etc
- d) These are also called the stone cells
Correct answer is option 'A'. Can you explain this answer?
What is not true about sclereids?
[1996]
a)
These are parenchyma cells with thickened lignified walls
b)
These are elongated and flexible with tapered ends
c)
These are commonly found in the shells of nuts and in the pulp of guava, pear, etc
d)
These are also called the stone cells
|
Palak Khanna answered |
Sclereids are small bundles of sclerenchyma tissue in plants that form durable layers, such as the cores of apples and the gritty texture of pears. Sclereids are variable in shape. The cells can be isodiametric, prosenchymatic, forked or fantastically branched. The cell walls fill nearly all the cell’s volume. The shell of many seeds like those of nuts as well as the stones of drupes like cherries or plums are made up from sclereid.
A common structural feature of vessel elements and sieve tube elements are[2006]- a)pores on lateral walls
- b)presence of p-protein
- c)enucleate condition
- d)thick secondary walls
Correct answer is option 'C'. Can you explain this answer?
A common structural feature of vessel elements and sieve tube elements are
[2006]
a)
pores on lateral walls
b)
presence of p-protein
c)
enucleate condition
d)
thick secondary walls
|
Ishani Nambiar answered |
In plant conducting tissue xylem has an important integral cell as xylem vessel which is without nucleus. The phloem on other hand has a row of sieve tubes which are also without nucleus at maturity.
Water containing cavities in vascular bundles are found in :[2012] - a)Sunflower
- b)Maize
- c)Cycas
- d)Pinus
Correct answer is option 'B'. Can you explain this answer?
Water containing cavities in vascular bundles are found in :
[2012]
a)
Sunflower
b)
Maize
c)
Cycas
d)
Pinus
|
Shivani Dasgupta answered |
Water containing cavities in vascular bundles are found in Maize.
Explanation:
Water containing cavities in vascular bundles are called water or secretory cavities. They are specialized structures found in certain plants that store and transport water. Maize, also known as corn, is a plant that possesses these water-containing cavities in its vascular bundles.
Vascular bundles are complex structures found in plants that consist of xylem and phloem tissues. Xylem is responsible for the transport of water and minerals from the roots to the other parts of the plant, while phloem is responsible for the transport of sugars and organic substances.
In Maize, the vascular bundles are scattered throughout the stem and leaf tissues. These bundles contain specialized cells called hydathodes, which are responsible for the secretion of water into the cavities. The water or secretory cavities are interconnected and allow the movement of water within the plant.
The presence of water cavities in Maize is an adaptation to its habitat. Maize is a C4 plant, which means it has a specialized mechanism for efficient photosynthesis in hot and dry conditions. The water cavities in the vascular bundles of Maize help in water storage and provide a constant supply of water to the plant, even during dry periods.
Additionally, these water cavities in Maize also help in cooling the plant. As water evaporates from the cavities, it creates a cooling effect, which is beneficial in hot environments.
In conclusion, water containing cavities in vascular bundles are found in Maize. These cavities play an important role in water storage, transport, and cooling of the plant. They are an adaptation that enables Maize to survive in hot and dry conditions.
Explanation:
Water containing cavities in vascular bundles are called water or secretory cavities. They are specialized structures found in certain plants that store and transport water. Maize, also known as corn, is a plant that possesses these water-containing cavities in its vascular bundles.
Vascular bundles are complex structures found in plants that consist of xylem and phloem tissues. Xylem is responsible for the transport of water and minerals from the roots to the other parts of the plant, while phloem is responsible for the transport of sugars and organic substances.
In Maize, the vascular bundles are scattered throughout the stem and leaf tissues. These bundles contain specialized cells called hydathodes, which are responsible for the secretion of water into the cavities. The water or secretory cavities are interconnected and allow the movement of water within the plant.
The presence of water cavities in Maize is an adaptation to its habitat. Maize is a C4 plant, which means it has a specialized mechanism for efficient photosynthesis in hot and dry conditions. The water cavities in the vascular bundles of Maize help in water storage and provide a constant supply of water to the plant, even during dry periods.
Additionally, these water cavities in Maize also help in cooling the plant. As water evaporates from the cavities, it creates a cooling effect, which is beneficial in hot environments.
In conclusion, water containing cavities in vascular bundles are found in Maize. These cavities play an important role in water storage, transport, and cooling of the plant. They are an adaptation that enables Maize to survive in hot and dry conditions.
A narrow layer of thin walled cells found between phloem/bark and wood of a dicot is[1993]- a)Cork cambium
- b)Vascular cambium
- c)Endodermis
- d)Pericycle
Correct answer is option 'B'. Can you explain this answer?
A narrow layer of thin walled cells found between phloem/bark and wood of a dicot is
[1993]
a)
Cork cambium
b)
Vascular cambium
c)
Endodermis
d)
Pericycle
|
|
Shanaya Rane answered |
Vascular cambium is produced by two types of meristems, fascicular and interfascicular cambium.
Select the correct pair. [NEET 2021]- a)Cells of medullary rays that form part of a cambial ring - Interfascicular cambium
- b)Loose parenchyma cells rupturing the epidermis and forming a lens-shaped opening in the bark - Spongy parenchyma
- c)Large colorless empty cells in the epidermis of grass leaves - Subsidiary cells
- d)In dicot leaves, vascular bundles are surrounded tissue by large thick-walled cells - Conjunctive tissue
Correct answer is option 'A'. Can you explain this answer?
Select the correct pair. [NEET 2021]
a)
Cells of medullary rays that form part of a cambial ring - Interfascicular cambium
b)
Loose parenchyma cells rupturing the epidermis and forming a lens-shaped opening in the bark - Spongy parenchyma
c)
Large colorless empty cells in the epidermis of grass leaves - Subsidiary cells
d)
In dicot leaves, vascular bundles are surrounded tissue by large thick-walled cells - Conjunctive tissue
|
Anjali Sharma answered |
The cells of medullary rays, adjoining these intrafascicular cambium become meristematic and form the interfascicular cambium.
Passage cells are thin-walled cells found in______.
[2007]
- a)phloem elements that serve as entry points for substance for transport ot other plant parts
- b)testa of seeds to enable emergence of growing embryonic axis during seed germination
- c)central region of style through which the pollen tube grows towards the ovary
- d)endodermis of roots facilitating rapid transport of water from cortex to pericycle.
Correct answer is option 'D'. Can you explain this answer?
Passage cells are thin-walled cells found in______.
[2007]
a)
phloem elements that serve as entry points for substance for transport ot other plant parts
b)
testa of seeds to enable emergence of growing embryonic axis during seed germination
c)
central region of style through which the pollen tube grows towards the ovary
d)
endodermis of roots facilitating rapid transport of water from cortex to pericycle.
|
Nayanika Reddy answered |
- The endodermis is the central, innermost layer of cortex in some land plants.
- It is made of compact living cells surrounded by an outer ring of endodermal cells, that are impregnated with hydrophobic substances to restrict the apoplastic flow of water to the inside.
- Passage cells are endodermal cells of older roots, which have retained thin walls and Casparian strips rather than becoming suberized and waterproof like the other cells around them, to continue to allow some symplastic flow to the inside from cortex to pericycle.
Palisade parenchyma is absent in leaves of:[2009]- a)mustard
- b)soybean
- c)gram
- d)sorghum
Correct answer is option 'D'. Can you explain this answer?
Palisade parenchyma is absent in leaves of:
[2009]
a)
mustard
b)
soybean
c)
gram
d)
sorghum
|
Kaavya Chavan answered |
Explanation:
The palisade parenchyma is a type of tissue found in leaves that is responsible for photosynthesis. It is located in the upper layer of the mesophyll, just below the upper epidermis. This tissue is composed of elongated cells that are tightly packed together and contain numerous chloroplasts, which are the organelles responsible for capturing light energy and converting it into chemical energy.
Option D: Sorghum
Sorghum is a type of grass that is widely cultivated for its grain. Unlike most other grasses, sorghum leaves do not have a distinct palisade parenchyma layer. Instead, the mesophyll tissue in sorghum leaves is composed of irregularly shaped cells that are loosely arranged. This is an adaptation that allows sorghum plants to tolerate drought and high temperatures, as the loosely arranged mesophyll cells provide a larger surface area for gas exchange and reduce water loss through transpiration.
Options A, B, and C: Mustard, Soybean, and Gram
In contrast to sorghum, mustard, soybean, and gram leaves all have a well-developed palisade parenchyma layer. This layer is important for maximizing photosynthetic efficiency by providing a large surface area for light absorption and allowing for efficient gas exchange. The presence of a palisade parenchyma layer in these plants indicates that they are well-adapted to capturing and utilizing light energy for photosynthesis.
In summary, palisade parenchyma is absent in the leaves of sorghum (option D), while it is present in the leaves of mustard, soybean, and gram (options A, B, and C). This difference in leaf structure reflects the different adaptations of these plants to their respective environments.
The palisade parenchyma is a type of tissue found in leaves that is responsible for photosynthesis. It is located in the upper layer of the mesophyll, just below the upper epidermis. This tissue is composed of elongated cells that are tightly packed together and contain numerous chloroplasts, which are the organelles responsible for capturing light energy and converting it into chemical energy.
Option D: Sorghum
Sorghum is a type of grass that is widely cultivated for its grain. Unlike most other grasses, sorghum leaves do not have a distinct palisade parenchyma layer. Instead, the mesophyll tissue in sorghum leaves is composed of irregularly shaped cells that are loosely arranged. This is an adaptation that allows sorghum plants to tolerate drought and high temperatures, as the loosely arranged mesophyll cells provide a larger surface area for gas exchange and reduce water loss through transpiration.
Options A, B, and C: Mustard, Soybean, and Gram
In contrast to sorghum, mustard, soybean, and gram leaves all have a well-developed palisade parenchyma layer. This layer is important for maximizing photosynthetic efficiency by providing a large surface area for light absorption and allowing for efficient gas exchange. The presence of a palisade parenchyma layer in these plants indicates that they are well-adapted to capturing and utilizing light energy for photosynthesis.
In summary, palisade parenchyma is absent in the leaves of sorghum (option D), while it is present in the leaves of mustard, soybean, and gram (options A, B, and C). This difference in leaf structure reflects the different adaptations of these plants to their respective environments.
Secondary xylem and phloem in dicot stem are produced by [NEET 2018]- a)Apical meristems
- b)Vascular cambium
- c)Phellogen
- d)Axillary meristems
Correct answer is option 'B'. Can you explain this answer?
Secondary xylem and phloem in dicot stem are produced by [NEET 2018]
a)
Apical meristems
b)
Vascular cambium
c)
Phellogen
d)
Axillary meristems
|
Suresh Iyer answered |
- Vascular cambium is a type of lateral meristem that produces secondary tissues (xylem and phloem) during secondary growth.
- It is produced by two types of meristem: intrafascicular cambium (primary meristem occurring as strip in vascular bundles) and interfascicular cambium (secondary meristem which develops from permanent cells of medullary rays which occur at the level of intrafascicular strips).
- The cells of vascular cambium are of two types : fusiform initials which produce secondary xylem towards outside and secondary phloem towards inner side and ray initials which give rise to vascular rays.
Periderm is produced by[1993]- a)Vascular cambium
- b)Fascicular cambium
- c)Phellogen
- d)Intrafascicular cambium
Correct answer is option 'C'. Can you explain this answer?
Periderm is produced by
[1993]
a)
Vascular cambium
b)
Fascicular cambium
c)
Phellogen
d)
Intrafascicular cambium
|
Abhijeet Goyal answered |
Secondary ground tissue or periderm is formed from phellogen or cork cambium. The phellogen forms phellem on the outer face and phelloderm on the inner. The three layers i.e., phellem, phellogen and phelloderm jointly constitute the periderm.
In barley stem vascular bundles are:[2009]- a)closed and scattered
- b)open and in a ring
- c)closed and radial
- d)open and scattered
Correct answer is option 'A'. Can you explain this answer?
In barley stem vascular bundles are:
[2009]
a)
closed and scattered
b)
open and in a ring
c)
closed and radial
d)
open and scattered
|
Snehal Shah answered |
In barley stem vascular bundles are closed and scattered. They are open only for a hours in the day time and never open at night. e.g Cereals.
Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by[2009]- a)absence of secondary phloem
- b)presence of cortex
- c)position of protoxylem
- d)absence of secondary xylem
Correct answer is option 'C'. Can you explain this answer?
Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by
[2009]
a)
absence of secondary phloem
b)
presence of cortex
c)
position of protoxylem
d)
absence of secondary xylem
|
Krish Khanna answered |
Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by position of protoxylem. In dicot root the protoxylem is located near the periphery of the vascular cylinder while in dicot stem the protoxylem is located near the centre of vascular bundle i.e. the xylem is endarch.
Transition of radial vascular bundle in root to conjoint vascular bundle in stem occurs in which zone?[1999] - a)Epicotyl
- b)Hypocotyl
- c)Meristem
- d)At base of stem
Correct answer is option 'B'. Can you explain this answer?
Transition of radial vascular bundle in root to conjoint vascular bundle in stem occurs in which zone?
[1999]
a)
Epicotyl
b)
Hypocotyl
c)
Meristem
d)
At base of stem
|
Ruchi Chakraborty answered |
Transition of radial vascular bundle in root to conjoint vascular bundle in stem occurs in transition zone which is generally hypocotyl. Hypocotyl is the part of embryonal axis below the level of cotyledons.
Chlorenchyma is known to develop in the [2003]- a)pollen tube of Pinus
- b)cytoplasm of Chlorella
- c)mycelium of a green mould such as Aspergillus
- d)spore capsule of a moss
Correct answer is option 'D'. Can you explain this answer?
Chlorenchyma is known to develop in the
[2003]
a)
pollen tube of Pinus
b)
cytoplasm of Chlorella
c)
mycelium of a green mould such as Aspergillus
d)
spore capsule of a moss
|
|
Aman Sharma answered |
Chlorenchyma cells are those parenchymatous cell which contain chloroplast in them. They are capable of photosynthesis. A spore capsule of moss can perform photosynthesis, therefore chlorenchyma are present in them.
Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following. [NEET 2019]- a)Tyloses in vessels
- b)Closure of stomata
- c)Flaccidity of bulliform cells
- d)Shrinkage of air spaces in the spongy mesophyll
Correct answer is option 'C'. Can you explain this answer?
Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following. [NEET 2019]
a)
Tyloses in vessels
b)
Closure of stomata
c)
Flaccidity of bulliform cells
d)
Shrinkage of air spaces in the spongy mesophyll
|
Dev Patel answered |
In grasses, certain adaxial epidermal cells along the veins modify themselves into large, empty, colourless cells. These are called bulliform cells. When the bulliform cells in the leaves have absorbed water and arc turgid, the leaf surface is exposed. When they are flaccid due to water stress, they make the leaves curl inwards to minimise water loss.
Which of the following meristems is responsible for extrastelar secondary growth in dicotyledonous stem?[1998]- a)Intrafascicular cambium
- b)Interfascicular cambium
- c)Intercalary meristem
- d)Phellogen
Correct answer is option 'D'. Can you explain this answer?
Which of the following meristems is responsible for extrastelar secondary growth in dicotyledonous stem?
[1998]
a)
Intrafascicular cambium
b)
Interfascicular cambium
c)
Intercalary meristem
d)
Phellogen
|
|
Arindam Khanna answered |
Intrafascicular cambium occurs inside the vascular bundles in between xylem and phloem. Interfascicular cambium develops in the form of strips at the level of intrafascicular cambium of vascular bundles. Intercalary meristem lie in between areas of permanent tissues.
Function of companion cells is[2011M]- a)providing energy to sieve elements for active transport
- b)providing water to phloem
- c)loading of sucrose into sieve elements by passive transport
- d)loading of sucrose into sieve elements
Correct answer is option 'D'. Can you explain this answer?
Function of companion cells is
[2011M]
a)
providing energy to sieve elements for active transport
b)
providing water to phloem
c)
loading of sucrose into sieve elements by passive transport
d)
loading of sucrose into sieve elements
|
|
Prisha Singh answered |
Function of companion cell is to load sugar and amino acids into sieve elements. These cells use transmembrane proteins to take up by active transport.
Which one of the following is resistant to enzyme action?[2008]- a)Cork
- b)Wood fibre
- c)Pollen exine
- d)Leaf cuticle
Correct answer is option 'C'. Can you explain this answer?
Which one of the following is resistant to enzyme action?
[2008]
a)
Cork
b)
Wood fibre
c)
Pollen exine
d)
Leaf cuticle
|
Aniket Chawla answered |
Pollen exine is resistant to enzyme action. The hard outer layer called the exine is made up of sporopollenin which is one of the most resistant organic material known. It can withstand high temperatures and strong acids and alkali. No enzymes that degrades sporopollenin is so far known.
The cork cambium, cork and secondary cortex are collectively called:[2011]- a)phelloderm’
- b)phellogen
- c)periderm
- d)phellem
Correct answer is option 'C'. Can you explain this answer?
The cork cambium, cork and secondary cortex are collectively called:
[2011]
a)
phelloderm’
b)
phellogen
c)
periderm
d)
phellem
|
|
Pallabi Reddy answered |
Phellem, phellogen and phelloderm are collectively called periderm.
Vessels are found in[2002] - a)all angiosperms and some gymnosperms
- b)most of angiosperms and few gymnosperms
- c)all angiosperms, all gymnosperms and some pteriodophyta
- d)all pteridophyta
Correct answer is option 'B'. Can you explain this answer?
Vessels are found in
[2002]
a)
all angiosperms and some gymnosperms
b)
most of angiosperms and few gymnosperms
c)
all angiosperms, all gymnosperms and some pteriodophyta
d)
all pteridophyta
|
|
Arindam Khanna answered |
Generally gymnosperms do not have vessels but a few gymnosperms having vessels are Ephedra, Smilax etc. Most of angiosperms have vessels except of few e.g., Trochodendron.
Which of the following statements is true?[2002] - a)Tracheids are unicellular with wide lumen
- b)Tracheids are multicellular with narrow lumen
- c)Vessels are unicellular with wide lumen
- d)Vessels are multicellular with wide lumen
Correct answer is option 'D'. Can you explain this answer?
Which of the following statements is true?
[2002]
a)
Tracheids are unicellular with wide lumen
b)
Tracheids are multicellular with narrow lumen
c)
Vessels are unicellular with wide lumen
d)
Vessels are multicellular with wide lumen
|
Abhijit Anand answered |
Vessel are formed of many cell,having wide width
same line is written in the ncert
same line is written in the ncert
Closed vascular bundles lack[2012]- a)Ground tissue
- b)conjunctive tissue
- c)Cambium
- d)Pith
Correct answer is option 'C'. Can you explain this answer?
Closed vascular bundles lack
[2012]
a)
Ground tissue
b)
conjunctive tissue
c)
Cambium
d)
Pith
|
|
Sarthak Saini answered |
In closed vascular bundle cambium is absent between xylem and phloem.
The most abundant element present in the plants is[2004]- a)Carbon
- b)Nitrogen
- c)Manganese
- d)Iron
Correct answer is option 'A'. Can you explain this answer?
The most abundant element present in the plants is
[2004]
a)
Carbon
b)
Nitrogen
c)
Manganese
d)
Iron
|
Ritika Khanna answered |
Manganese and Iron are micronutrients required in trace amounts. Concentration of nitrogen in dry matter-15000 mg./ gm. Concentration of carbon in dry matter is 45,000 mg / gm.
Heartwood differs from sapwood in:[2010]- a)presence of rays and fibres
- b)absence of vessels and parenchyma
- c)having dead and non -conducting elements
- d)being susceptible to pests and pathogens
Correct answer is option 'C'. Can you explain this answer?
Heartwood differs from sapwood in:
[2010]
a)
presence of rays and fibres
b)
absence of vessels and parenchyma
c)
having dead and non -conducting elements
d)
being susceptible to pests and pathogens
|
|
Nayanika Reddy answered |
Heartwood differs from sapwood in having dead and non-conducting elements. In old trees, the inner region that comprises dead elements with highly lignified walls is called heartwood. Heartwood does not conduct water but gives mechanical support to the stem. On the other hand, the peripheral region, which is lighter in colour are called sapwood. It is involved in the conduction of water and minerals from root to leaf.
The apical meristem of the root is present[2003]- a)in all the roots
- b)only in radicals
- c)only in tap roots
- d)only in adventitious roots
Correct answer is option 'A'. Can you explain this answer?
The apical meristem of the root is present
[2003]
a)
in all the roots
b)
only in radicals
c)
only in tap roots
d)
only in adventitious roots
|
|
Ruchi Chakraborty answered |
The apical meristem of the root is present at all the root tips. Apical meristem is subterminal in position of the growing root tips and responsible for terminal growth of the root of plants.
Which one of the following is not a lateral meristem?[2010]- a)Intrafascicular cambium
- b)Interfascicular cambium
- c)Phellogen
- d)Intercalary meristem
Correct answer is option 'D'. Can you explain this answer?
Which one of the following is not a lateral meristem?
[2010]
a)
Intrafascicular cambium
b)
Interfascicular cambium
c)
Phellogen
d)
Intercalary meristem
|
|
Naveen Menon answered |
Meristem is divided on the basis of position in plant bodies into apical meristem, lateral meristem and intercalary meristem. Lateral meristem is present on the lateral sides, that is fascicular and interfascicular cambium and cork cambium (phellogen).
A leaf primordium grows into the adult leaf lamina by means of[1998]- a)apical meristem
- b)lateral meristem
- c)marginal meristems
- d)at first by apical meristem and later largely by marginal meristems.
Correct answer is option 'D'. Can you explain this answer?
A leaf primordium grows into the adult leaf lamina by means of
[1998]
a)
apical meristem
b)
lateral meristem
c)
marginal meristems
d)
at first by apical meristem and later largely by marginal meristems.
|
|
Aman Sharma answered |
A leaf primordium grows into the adult leaf lamina by means of first by apical meristem and later by marginal meristems.
The cells of the quiescent centre are characterised by[2003]- a)dividing regularly to add to tunica
- b)having dense cytoplasm and prominent nuclei
- c)having light cytoplasm and small nuclei
- d)dividing regularly to add to the corpus
Correct answer is option 'C'. Can you explain this answer?
The cells of the quiescent centre are characterised by
[2003]
a)
dividing regularly to add to tunica
b)
having dense cytoplasm and prominent nuclei
c)
having light cytoplasm and small nuclei
d)
dividing regularly to add to the corpus
|
Rajesh Datta answered |
The cells of queiscent centre have lower concentration of DNA, RNA and protein as compared to other cells in the root apex. These cells do not divide, hence cytoplasm is light and nuclei are small in them. This concept is based upon quiescent centre theory proposed by Clowes (1961).
At maturity which of the following is enucleate?[1997]- a)Sieve cell
- b)Companion cell
- c)Palisade cell
- d)Cortical cell
Correct answer is option 'A'. Can you explain this answer?
At maturity which of the following is enucleate?
[1997]
a)
Sieve cell
b)
Companion cell
c)
Palisade cell
d)
Cortical cell
|
|
Rajesh Datta answered |
At maturity all physiological functions of sieve tube takes place in companion cell, since the sieve tube elements lose their nucleus at maturity.
The vascular cambium normally gives rise to [NEET 2017]- a)Primary phloem
- b)Secondary xylem
- c)Periderm
- d)Phelloderm
Correct answer is option 'B'. Can you explain this answer?
The vascular cambium normally gives rise to [NEET 2017]
a)
Primary phloem
b)
Secondary xylem
c)
Periderm
d)
Phelloderm
|
|
Dev Patel answered |
Cells of vascular cambium divide periclinal both on the outer and inner sides to form secondary permanent tissues, i.e., secondary xylem and secondary phloem.
Identify the incorrect statement. [NEET 2020]- a)Sapwood is the innermost secondary xylem and is lighter in colour.
- b)Due to deposition of tannins, resins, oils etc., heart wood is dark in colour.
- c)Heart wood does not conduct water but gives mechanical support.
- d)Sapwood is involved in conduction of water and minerals from root to leaf.
Correct answer is option 'A'. Can you explain this answer?
Identify the incorrect statement. [NEET 2020]
a)
Sapwood is the innermost secondary xylem and is lighter in colour.
b)
Due to deposition of tannins, resins, oils etc., heart wood is dark in colour.
c)
Heart wood does not conduct water but gives mechanical support.
d)
Sapwood is involved in conduction of water and minerals from root to leaf.
|
|
Anjali Sharma answered |
In a large tree, only the outer secondary xylem (sapwood) serves in water conduction, while the inner part (heartwood) is composed of dead but structurally strong secondary xylem and is darker in colour due to the deposition of tannins, resins and oils.
Loading of pholem is related to[2001]- a)increases of sugar in phloem
- b)elongation of phloem cell
- c)separation of phloem parenchyma
- d)strengthening of phloem fibre
Correct answer is option 'A'. Can you explain this answer?
Loading of pholem is related to
[2001]
a)
increases of sugar in phloem
b)
elongation of phloem cell
c)
separation of phloem parenchyma
d)
strengthening of phloem fibre
|
|
Aman Sharma answered |
Phloem is involved in transport of organic food. According to mass flow hypothesis organic substances flow in solution form in sieve elements due to development of an osmotically generated pressure gradient.
In a longitudinal section of a root, starting from the tip upward, the four zones occur in the following order:[2004]- a)Root cap, cell division, cell enlargement, cell maturation
- b)Root cap, cell division, cell maturation, cell enlargement
- c)Cell division, cell enlargement, cell maturation, root cap
- d)Cell division, cell maturation, cell enlargement, root cap
Correct answer is option 'A'. Can you explain this answer?
In a longitudinal section of a root, starting from the tip upward, the four zones occur in the following order:
[2004]
a)
Root cap, cell division, cell enlargement, cell maturation
b)
Root cap, cell division, cell maturation, cell enlargement
c)
Cell division, cell enlargement, cell maturation, root cap
d)
Cell division, cell maturation, cell enlargement, root cap
|
|
Arindam Khanna answered |
Root shows the following regions Root cap or calyptra - caplike protective covering over tip of the root Meristematic region is the subapical position Zone of elongation - receives news cells from the growing point Root hair zone - is the zone of differentiation Zone of mature cells - having thick walled impermeable cells.
Axillary bud and terminal bud are derived from the activity of[2002]- a)lateral meristem
- b)intercalary meristem
- c)apical meristem
- d)parenchyma
Correct answer is option 'C'. Can you explain this answer?
Axillary bud and terminal bud are derived from the activity of
[2002]
a)
lateral meristem
b)
intercalary meristem
c)
apical meristem
d)
parenchyma
|
|
Arindam Khanna answered |
Apical meristem is located at the apex of stem, root and their branches and forms axillary bud & terminal bud. Intercalary meristems take part in linear growth. Lateral meristem occur parallel to the circumference of the organs. They increase girth of the plant.
Some vascular bundles are described as open because these[2011M]- a)are surrounded by pericycle but not endodermis
- b)are capable of producing secondary xylem and phloem
- c)possess conjunctive tissue between xylem and phloem
- d)are not surrounded by pericycle
Correct answer is option 'B'. Can you explain this answer?
Some vascular bundles are described as open because these
[2011M]
a)
are surrounded by pericycle but not endodermis
b)
are capable of producing secondary xylem and phloem
c)
possess conjunctive tissue between xylem and phloem
d)
are not surrounded by pericycle
|
|
Aniket Chawla answered |
Open means presence of cambium during secondary growth. Vascular cambium divides to form secondary xylem towards inner side while secondary phloem towards outside.
Ground tissue includes[2011]- a)all tissues external to endodermis
- b)all tissues except epidermis and vascular bundles
- c)epidermis and cortex
- d)all tissues internal to endodermis
Correct answer is option 'B'. Can you explain this answer?
Ground tissue includes
[2011]
a)
all tissues external to endodermis
b)
all tissues except epidermis and vascular bundles
c)
epidermis and cortex
d)
all tissues internal to endodermis
|
|
Snehal Shah answered |
Ground tissue includes all tissues except epidermis and vascular bundles. The ground tissue comprises the bulk of the primary plant body. Parenchyma, collenchyma and sclerenchyma cells are common in the ground tissue.
Chapter doubts & questions for Anatomy of Flowering Plants - NEET Past Year Papers 2025 is part of NEET exam preparation. The chapters have been prepared according to the NEET exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for NEET 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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