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NEET Previous Year Questions(2016-24): Anatomy of Flowering Plants | Biology Class 11 PDF Download

2024

Q1: Bulliform cells are responsible for     (NEET 2024)
(a) Inward curling of leaves in monocots.
(b) Protecting the plant from sall stress.
(c) Increased photosynthesis in monocots.
(d) Providing large spaces for storage of sugars.
Ans:
(a)
Sol: Bulliform cells, which are specialized cells found in the leaves of many monocot plants such as grasses, play a crucial role in responding to environmental stress conditions like water scarcity. Their primary function is associated with the mechanism of leaf folding or rolling during drought or high temperature conditions. This adaptive feature helps in reducing the leaf surface exposed to the air, thereby minimizing water loss through transpiration.
Now, let’s evaluate each option in relation to the role of bulliform cells:

Option A: Inward curling of leaves in monocots.
This option is correct. Bulliform cells are large, thin-walled, and filled with water. When these cells lose water under dry conditions, they collapse, causing the leaf to fold or roll inward. This curling mechanism helps to reduce the exposure of the surface area of the leaf to the harsh environment, thus reducing water loss and protecting the plant during drought.

Option B: Protecting the plant from salt stress.
This option is not correct. While bulliform cells are involved in protecting the plant by reducing transpiration, their role specifically in protecting from salt stress isn't well-documented. Salt stress protection involves other physiological and biochemical responses in plants.

Option C: Increased photosynthesis in monocots.
This is also incorrect. Bulliform cells do not directly influence photosynthesis rates. Their function is mainly related to the mechanical folding of the leaf, which indirectly may influence photosynthetic efficiency under stress conditions but is not their primary role.

Option D: Providing large spaces for storage of sugars.
This option is incorrect. Bulliform cells are not involved in the storage of sugars. Their structure and function are geared towards managing water content for leaf folding mechanisms, rather than nutrient storage.

Therefore, the correct answer is Option A: Inward curling of leaves in monocots.

Q2: In the given figure, which component has thin outer walls and highly thickened inner walls?       (NEET 2024)
NEET Previous Year Questions(2016-24): Anatomy of Flowering Plants | Biology Class 11(a) C
(b) D
(c) A
(d) B
Ans: 
(a)
Guard cells to stomata have thin outer wall and highly thickened inner walls.

Q3:  Given below are two statements:     (NEET 2024)

Statement I : Parenchyma is living but collenchyma is dead tissue.
Statement II : Gymnosperms lack xylem vessels but presence of xylem vessels is the characteristic of angiosperms.

In the light of the above statements, choose the correct answer from the options given below:
(a) Both Statement I and Statement II are true
(b) Both Statement I and Statement II are false
(c) Statement I is true but Statement II is false
(d) Statement I is false but Statement II is true
Ans: 
(d)
Sol:  Let's analyze each statement separately to determine the correct answer:

Statement I: Parenchyma is living but collenchyma is dead tissue.
This statement is incorrect. Parenchyma and collenchyma are both types of simple tissues found in plants. Parenchyma is indeed a living tissue comprised of cells that are often involved in metabolic processes, storage, and photosynthesis. Collenchyma, similarly, is also a living tissue. It is known for providing support and mechanical strength to growing parts of a plant such as leaves and stems, particularly in areas where growth is active. The cells of collenchyma are elongated and have thicker primary walls compared to parenchyma, but they are definitely living.

Statement II: Gymnosperms lack xylem vessels but the presence of xylem vessels is the characteristic of angiosperms.

This statement is true. Gymnosperms are a group of seed-producing plants that include conifers, cycads, Ginkgo, and Gnetales. One of the distinguishing features of gymnosperms is that their xylem consists of tracheids but lacks vessels. Tracheids are elongated cells in the xylem of vascular plants that facilitate the transport of water and mineral salts. On the other hand, angiosperms, or flowering plants, have a more advanced xylem that contains both tracheids and vessels. Vessels are more efficient at transporting water than tracheids, which is one of the evolutionary advantages of angiosperms over gymnosperms.

Therefore, considering the above explanations:

  • Statement I is false as both parenchyma and collenchyma are living tissues.
  • Statement II is true regarding the absence of xylem vessels in gymnosperms and their presence in angiosperms.

Based on the analysis, the correct answer is: Option D: Statement I is false but Statement II is true

2023

Q1: Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R :           (NEET 2023)
Assertion A : Late wood has fewer xylary elements with narrow vessels.
Reason R : Cambium is less active in winters.
In the light of the above statements, choose the correct answer from the options given below :
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is NOT the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true

Ans: (a)

Assertion A is true: Late wood, also known as "summer wood," is the portion of a tree ring that is formed during the later part of the growing season. It typically has fewer xylary (wood-forming) elements and narrower vessels compared to early wood.

Reason R is true and provides the correct explanation for Assertion A: The cambium, a layer of actively dividing cells between the xylem and phloem, is responsible for the formation of new xylem cells. During winters, the cambium becomes less active due to the colder temperatures and reduced metabolic activity. This reduced cambial activity leads to the formation of narrower vessels and fewer xylary elements in the late wood.

Q2:  Given below are two statements :          (NEET 2023)
Statement I : Endarch and exarch are the terms often used for describing the position of secondary xylem in the plant body.
Statement II : Exarch condition is the most common feature of the root system.
In the light of the above statements, choose the correct answer from the options given below:
(a) Both Statement I and Statement II are true
(b) Both Statement I and Statement II are false
(c) Statement I is correct but Statement II is false
(d) Statement I is incorrect but Statement II is true

Ans: (d)

  • Statement I : Endarch and exarch are the terms often used for describing the position of secondary xylem in the plant body.
  • This statement is incorrect. Endarch and exarch are used to describe the developmental sequence of primary xylem, not secondary xylem. In endarch condition, the first formed xylem is towards the centre (protoxylem) and the last formed xylem is towards the periphery (metaxylem), which is typical of stems. In the exarch condition, the first formed xylem is towards the periphery and the last formed xylem is towards the centre, which is typical of roots.
  • Statement II : Exarch condition is the most common feature of the root system.
  • This statement is true. The exarch condition, where the first-formed xylem is towards the periphery and the last-formed xylem is towards the centre, is indeed the most common feature of the root system.

2022

Q1: "Girdling Experiment" was performed by Plant Physiologists to identify the plant tissue through which:
(a) water is transported
(b) food is transported
(c) for both water and food transportation
(d) osmosis is observed            (NEET 2022 Phase 1)
Ans: 
(b)
The girdling experiment shows that phloem is the tissue responsible for translocation of food; and that transport takes place in one direction i.e. towards the root.


Q2: Read the following statements about the vascular bundles:            (NEET 2022 Phase 1)
(a) In roots, the xylem and phloem in a vascular bundle are arranged in an alternate manner along the different radii. 
(b) Conjoint closed vascular bundles do not possess cambium. 
(c) In open vascular bundles, cambium is present in between xylem and phloem 
(d) The vascular bundles of dicotyledonous stem possess endarch protoxylem 
(e) In the monocotyledonous root, usually there are more than six xylem bundles present
Choose the correct answer from the options given below:
(a) (b), (c), (d) and (e) Only
(b) (a), (b), (c), (d) and (e)
(c) (a), (c), (d) and (e) Only
(d) (a), (b) and (d) Only
Ans: (d)
All the statements are correct regarding vascular bundles but none of the options with such combination is given.


Q3: In old trees the greater part of secondary xylem is dark brown and resistant to insect attack due to:           (NEET 2022 Phase 1)
(a) secretion of secondary metabolities and their deposition in the lumen of vessels.
(b) deposition of organic compounds like tannins and resins in the central layers of stem.
(c) deposition of suberin and aromatic substances in the outer layer of stem.
(d) deposition of tannins, gum, resin and aromatic substances in the peripheral layers of stem.
(e) presence of parenchyma cells, functionally active xylem elements and essential oils.
Choose the correct answer from the options given below:
(a) (c) and (d) Only
(b) (d) and (e) Only
(c) (b) and (d) Only
(d) (a) and (b) Only

Ans: (d)
In old trees, the greater part of secondary xylem is dark brown due to deposition of organic compounds like tannins, resins, oils, gums, aromatic substances and essential oils in the central or innermost layers of the stem. These substances make it hard, durable and resistant to the attacks of micro-organisms and insects.


Q4: what is the role of large bundle sheath cells found around the vascular bundles in C4 plants?        (NEET 2022 Phase 1)
(a) To provide the site for photorespiratory pathway
(b) To increase the number of chloroplast for the operation of Calvin cycle
(c) To enable the plant to tolerate high temperature
(d) To protect the vascular tissue from high light intensity
Ans:
(b)
The large cells around the vascular bundles of C4 plants form bundle sheath. These cells have large number of chloroplasts to perform calvin cycle.

Q5: The anatomy of springwood shows some peculiar features. Identify the correct set of statements about springwood.        (NEET 2022 Phase 1)
(a) It is also called as the earlywood
(b) In spring season cambium produces xylem elements with narrow vessels
(c) It is lighter in colour
(d) The springwood along with autumnwood shows alternate concentric rings forming annual rings
(e) It has lower density
Choose the correct answer from the options given below:
(a) (a), (c), (d) and (e) only
(b) (a), (b) and (d) only
(c) (c), (d) and (e) only
(d) (a), (b), (d) and (e) only

Ans: (a)

  • Spring wood is also called early wood. It is lighter in colour and has a lower density. The vessels are produced with the wider lumens to transport more water to meet the requirement by increased transpiring surface in spring season.
  • The spring and autumn wood appear as alternate concentric rings of light and dark colour forming annual rings.


Q6: Interfascicular cambium is present between      (NEET 2022 Phase 2)
(a) Secondary xylem and secondary phloem
(b) Primary xylem and primary phloem
(c) Pericycle and endodermis
(d) Two vascular bundles
Ans:
(d)
During secondary growth in dicot stem, the cells of medullary rays lie between the vascular bundles become dedifferentiated and give rise to new cambium called interfascicular cambium.


Q7: Initiation of lateral roots and vascular cambium during secondary growth takes place in cells of     (NEET 2022 Phase 2)
(a) Pericycle
(b) Epiblema
(c) Cortex
(d) Endodermis
Ans:
(a)
Initiation of lateral roots and vascular cambium during secondary growth takes place in pericycle cells of dicot roots. Epiblema, endodermis and cortex do not dedifferentiate.

2021

Q1: Match List-I with List-II.            (NEET 2021)
NEET Previous Year Questions(2016-24): Anatomy of Flowering Plants | Biology Class 11
Choose the correct answer from the options given below. 
      (a)  (b)  (c)  (d)
(a)  (ii) (iii) (iv)  (i)
(b) (iv) (ii)  (i)   (iii)
(c) (iv) (i)  (iii)  (ii)
(d) (iii) (i)  (iv)  (ii)
Ans: (d) 

  • Lenticels are meant for exchange of gases.
  • Phellogen is also known as cork cambium.
  • Phelloderm is also called secondary cortex because it is the cortex that develops during secondary growth.
  • Cork has deposition of suberin in their cell walls when they get mature.

Q2: Match List I with List II            (NEET 2021)
NEET Previous Year Questions(2016-24): Anatomy of Flowering Plants | Biology Class 11

Select the correct answer from the options given below.
     (a)      (b)     (c)     (d)
(a) (i)      (ii)     (iii)     (iv)

(b) (iii)    (ii)     (iv)     (i)
(c) (ii)     (iv)     (i)      (iii)
(d) (iv)    (iii)    (ii)      (i)

Ans: (c)
(a) Meristematic tissues are those tissues which have cells with active cell division capacity.
(b) Simple tissues are those tissues which have all the cells similar in structure and function.
(c) Vascular tissues are complex permanent tissues hence they have different types of cells.
(d) Sclereids are sclerenchymatous cells which are dead with highly thickened walls and narrow lumen.


Q3: 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 colourless empty cells in the epidermis of grass leaf - Subsidiary cells
(d) In dicot leaves, vascular bundles are surrounded tissue by large thick-walled cells - Conjunctive tissue
Ans: (a) 

  • When the cells of medullary rays differentiated, they give rise to the new cambium called interfascicular cambium.
  • Loose parenchyma cells rupturing the epidermis and forming a lens-shaped opening in bark are called complementary cells.
  • Large colorless empty cells in the epidermis of grass leaves are called bulliform cells.
  • In dicot leave, vascular bundles are surrounded by large thick walled cells called bundle sheath cells.

2020

Q1: Identify the incorrect statement.            (NEET 2020)
(a) Sapwood is the innermost secondary xylem and is lighter in colour.
(b) Due to the deposition of tannins, resins, oils etc., the heartwood is dark in colour.
(c) Heartwood does not conduct water but gives mechanical support.
(d) Sapwood is involved in the conduction of water and minerals from the root to the leaf.

Ans: (a) 
Correct statement: Sapwood is outermost secondary xylem. Outer secondary xylem or sapwood serves in water conduction, while the inner part called heartwood is composed of dead but structurally strong primary xylem.


Q2: The transverse section of a plant shows the following anatomical features:    
(i) a Large number of scattered vascular bundles surrounded by bundle sheath.
(ii) Large conspicuous parenchymatous ground tissue.
(iii) Vascular bundles conjoint and closed.
(iv) Phloem parenchyma absent.

Identify the category of plant and its part:            (NEET 2020)
(a) Dicotyledonous stem
(b) Dicotyledonous root
(c) Monocotyledonous stem
(d) Monocotyledonous root
Ans: (c) 
The monocot stem is characterised by conjoint, collateral, and closed vascular bundles, scattered in the ground tissue containing the parenchyma. Each vascular bundle is surrounded by sclerenchymatous bundle-sheath cells. Phloem parenchyma and medullary rays are absent in monocot stems.


Q3: The roots that originate from the base of the stem are          (NEET 2020)
(a) Primary roots
(b) Prop roots
(c) Lateral roots
(d) Fibrous roots
Ans:
(d)
The roots that originate from the base of the stem are fibrous roots. A fibrous root system is the opposite of a taproot system. It is usually formed by thin, moderately branching roots growing from the stem. A fibrous root system is universal in monocotyledonous plants and ferns. The fibrous root systems look like a mat made out of roots when the tree has reached full maturity.

2019

Q1: Phloem in gymnosperms lacks           (NEET 2019)
(a) Both sieve tubes and companion cells
(b) Albuminous cells and sieve cells
(c) Sieve tubes only
(d) Companion cells only.

Ans: (a)
In gymnosperms only sieve cells and albuminous cells are present but they lack sieve tubes and companion cells.


Q2: What is the direction of movement of sugars in phloem?         (NEET 2019)
(a) Downward
(b) Bi-directional
(c) Non-multidirectional
(d) Upward
Ans: 
(b)
The direction of movement of sugars in phloem is Bi-directional.

2018

Q1: Stomata in grass leaf are          (NEET 2018)   
(a) Dumb-bell shaped
(b) Kidney-shaped
(c) Rectangular
(d) Barrel-shaped
Ans: (a)
Grass being a monocot, has Dumb-bell shaped stomata in their leaves.


Q2: Secondary xylem and phloem in dicot stem are produced by          (NEET 2018)   
(a) Apical meristems
(b) Vascular cambium
(c) Phellogen
(d) Axillary meristems
Ans: (b)

The cells of vascular cambium cut off towards pith, mature into secondary xylem and the cells cut off towards periphery mature into secondary phloem during secondary growth in dicot stem.


Q3: Casparian strips occur in          (NEET 2018)   
(a) Epidermis
(b) Pericycle
(c) Cortex
(d) Endodermis.

Ans: (d)
Endodermis have casparian strips on radial and inner tangential wall. It is rich in suberin.


Q4: Plants having little or no secondary growth are          (NEET 2018)
(a) Grasses
(b) Deciduous angiosperms
(c) Conifers
(d) Cycads.

Ans: (a)
Grasses are monocots and monocots usually do not have secondary growth.
Palm like monocots have anomalous secondary growth

2017

Q1: The vascular cambium normally gives rise to          (NEET 2017)
(a) Primary phloem
(b) Secondary xylem
(c) Periderm
(d) Phelloderm.

Ans: (b)
Cells of vascular cambium divide periclinally both on the outer and inner sides to form secondary permanent tissues, i.e., secondary xylem and secondary phloem.


Q2: Which of the following is made up of dead cells?          (NEET 2017)
(a) Collenchyma
(b) Phellem
(c) Phloem
(d) Xylem parenchyma

Ans: (b)
Cork cambium undergoes periclinal division and cuts off thick walled suberised dead cells towards outside i.e. phellem (cork) and it cuts off thin walled living cells i.e., phelloderm on inner side.


Q3: Identify the wrong statement in the context of heartwood.          (NEET 2017)
(a) It is highly durable.
(b) It conducts water and minerals efficiently
(c) It comprises dead elements with highly lignified walls.
(d) Organic compounds are deposited in it.

Ans: (b)
Heartwood is inactive physiologically due to deposition of organic compounds and formation of tyloses so it will not conduct water and minerals.


Q4: Root hair develops from the region of          (NEET 2017)
(a) Elongation
(b) Root cap
(c) Meristematic activity
(d) Maturation.

Ans: (a)
In roots, the root hairs develops from zone of maturation. This zone is differentiated zone thus bearing root hairs.

2016

Q1: Cortex is the region found between          (NEET 2016)
(a) Epidermis and stele
(b) Pericycle and endodermis
(c) Endodermis and pith
(d) 
Endodermis and vascular bundle.
Ans: (a)
In botanical terms, the cortex of a plant is the region found between the epidermis and the stele. Therefore, the correct answer is:
Option (a) : Epidermis and stele.
To clarify:

  • Epidermis: This is the outermost layer of cells in the plant stem and root. It serves as a protective barrier against the external environment.
  • Stele: This is the central part of the root or stem, containing the vascular tissue (xylem and phloem), pith, and often a pericycle. The stele is located inside the endodermis.
  • The cortex lies between these two layers, functioning mainly in storage and transport of nutrients and water. It is composed primarily of parenchyma cells and is a significant part of the root and stem where it often stores starch.

The other options refer to different parts of the plant anatomy:

  • Option C: "Endodermis and pith" - The pith is located in the center of the stem, surrounded by the vascular tissue, which is inside the endodermis. The cortex is not between these two.
  • Option D: "Endodermis and vascular bundle" - The endodermis is a single layer of cells forming a boundary between the cortex and the stele; it doesn't define the boundaries of the cortex.
  • Option B: "Pericycle and endodermis" - The pericycle is a layer of cells found just inside the endodermis, and it is part of the stele. This option does not correctly describe the position of the cortex.

Thus, Option A is the most accurate in describing the location of the cortex in a plant.


Q2: The balloon-shaped structures called tyloses          (NEET 2016)
(a) Originate in the lumen of vessels
(b) Characterise the sapwood
(c) Are extensions of xylem parenchyma cells into vessels
(d) Are linked to the ascent of sap through xylem vessels.
Ans: (c)
Tyloses are balloon-like extensions of parenchyma cells that protrudes into the lumen of a neighbouring xylem vessel or tracheid through a pit in the cell wall. Tyloses form most commonly in older woody tissue, possibly in response to injury, they may eventually block the vessels and thus prevent the spread of fungi and other pathogens within the plant. Tyloses may become filled with tannins, gums, pigments, etc., giving heartwood its dark colour, and their walls can remain thin or become lignified.

Q3: Specialized epidermal cells surrounding the guard cells are called          (NEET 2016)
(a) Bulliform cells
(b) Lenticels
(c) Complementary cells
(d) Subsidiary cells.

Ans: (d)
Specialized epidermal cells surrounding the guard cells are known as Subsidiary or accessory cell.

2015

Q1: Transmission tissue is the characteristic feature of          (NEET 2015)
(a) Solid style
(b) Dry stigma
(c) Wet stigma
(d) Hollow style
Ans: (a)
A solid style has transmission tissue that has large intercellular spaces. It allows the growth of pollen tubes in pistils.


Q2: A major characteristic of the monocot root is the presence of          (NEET 2015)
(a) Scattered vascular bundles
(b) Vasculature without cambium
(c) Cambium sandwiched between phloem and xylem along the radius
(d) Open vascular bundles

Ans: (b)
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.


Q3: In a ring girdled plant:          (NEET 2015)
(a) The root dies first
(b) The shoot and root die together
(c) Neither root nor shoot will die
(d) The shoot dies first

Ans: (a)
Phloem is responsible for carrying nutrients made by photosynthesis in the leaves down to the roots. If that path is cut by girdling then no nutrients can reach the roots, and the roots die. Eventually the entire plant dies.


Q4: Vascular bundles in monocotyledons are considered closed because:          (NEET 2015)
(a) Cambium is absent
(b) There are no vessels with perforations
(c) Xylem is surrounded all around by phloem
(d) A bundle sheath surrounds each bundle

Ans: (a)
Vascular bundles in monocotyledons are considered as closed because cambium is absent in the vascular system and thus they lack secondary growth in the thickness.


Q5: Read the different components from (A) to (D) in the list given below and tell the correct order of the components with reference to their arrangement from the outer side to the inner side in a woody dicot stem.          (NEET 2015)
(A) Secondary cortex
(B) Wood
(C) Secondary phloem
(D) Phellem
The correct order is:
(a) (A), (B), (D), (C)
(b) (D), (A), (C), (B)
(c) (D), (C), (A), (B)
(d) (C), (D), (B), (A)

Ans: (b)

[(d) → (a) → (c) → (b)]

The correct sequence from outer side to inner side in a woody dicot stem is as follows:
Phellem →Secondary cortex → Secondary phloem → Wood , 

2014

Q1: You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?          (NEET 2014)
(a) Secondary xylem
(b) Secondary phloem
(c) Protoxylem
(d) Cortical cells

Ans: (c)
The 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.


Q2: Tracheids differ from other tracheary elements in:          (NEET 2014)
(a) Having Casparian strips
(b) Being imperforate
(c) Lacking nucleus
(d) Being lignified

Ans: (b)
The walls of vessels (tracheary elements) are lignified and less thick than tracheids. The lumen is wider. Vessels differ from tracheids in being cell fusions arising through the dissolution of end walls.

The document NEET Previous Year Questions(2016-24): Anatomy of Flowering Plants | Biology Class 11 is a part of the NEET Course Biology Class 11.
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FAQs on NEET Previous Year Questions(2016-24): Anatomy of Flowering Plants - Biology Class 11

1. What are the main parts of a flowering plant anatomy?
Ans. The main parts of a flowering plant anatomy include roots, stems, leaves, flowers, and fruits.
2. What is the function of roots in a flowering plant?
Ans. Roots in a flowering plant help in anchoring the plant to the ground, absorbing water and nutrients from the soil, and storing food reserves.
3. How do stems contribute to the growth and development of a flowering plant?
Ans. Stems provide support to the plant, transport water and nutrients from the roots to the leaves, and also serve as a site for photosynthesis.
4. What is the significance of leaves in a flowering plant?
Ans. Leaves are responsible for photosynthesis, where they convert sunlight into energy for the plant. They also help in transpiration and gas exchange.
5. How do flowers and fruits play a role in the reproduction of flowering plants?
Ans. Flowers contain reproductive organs that facilitate pollination and fertilization, leading to the formation of fruits that protect and disperse seeds for the next generation of plants.
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