MCQ ON DICOTYLEDONOUS LEAF AND MONOCOTYLEDONOUS LEAF / DICOTYLEDONOUS LEAF AND MONOCOTYLEDONOUS LEAF class 11 for NEET | DICOTYLEDONOUS LEAF AND MONOCOTYLEDONOUS LEAF class 11| MCQ ON DICOTYLEDONOUS LEAF AND MONOCOTYLEDONOUS LEAF with Answer | Check the below NCERT MCQ question for class 11Biology based on the with Answers.
MCQ on DICOTYLEDONOUS LEAF AND MONOCOTYLEDONOUS LEAF class 11Biology with answers were prepared based on the latest pattern.We have provided class 11 Biology MCQs question with Answers to help students understand the concept very well.
MCQ ON DICOTYLEDONOUS LEAF AND MONOCOTYLEDONOUS LEAF is useful for NEET / CSIR / UGC / CBSE / ICSE / AIIMS / EXAM / AFMC EXAM / STATE LEVEL MEDICAL EXAM/ KVS PGT BIOLOGY / NVS PGT BIOLOGY EXAM 2023-2024 ,2025
INTRODUCTION:-
DICOTYLEDONOUS LEAF AND MONOCOTYLEDONOUS LEAF :-
The vertical section of a dorsoventral leaf through the lamina shows three main parts namely epidermis mesophyll and vascular system.
The epidermis which covers both the upper surface and lower surface of the leaf has a conspicuous cuticle .
The abaxial epidermis generally bears more stomata than the adaxial epidermis.
The latter may even lack stomata .
The tissue between the upper and the lower epidermis is called the mesophyll.
Mesophyll which possess chloroplast which carry out photosynthesis is made up of parenchyma .
It is of two types – the palisade parenchyma and the spongy parenchyma .
The vascular bundles are surrounded by a layer of thick walled bundle sheath cells.
The anatomy of isobilateral leaf is similar to that of the dorsoventral leaf in many ways.
It shows the following characteristic differences.
In an isobilateral leaf the stomata are present on the both the surfaces of the epidermis and the mesophyll is not differentiated into palisade and spongy parenchyma.
In grasses certain adaxial epidermal cells along the veins modify themselves into large empty colourless cells . These are called bulliform cells.
The transverse section of a typical young dicotyledonous stems shows that the epidermis is the outermost protective layer .
Covered with a thin layer of cuticle , it may be trichomes and a few stomata .The cells arranged in multiple layers between epidermis and pericycle constitute the cortex.
It consists of three sub-zones . The outer hypodermis consist of a few layers of collenchymous cells with conspicuous intercellular spaces.
The innermost layer of the cortex is called endodermis.
The cells of the endodermis are rich in starch grains and the layer is also referred to as starch sheath.
Pericycle is present on the inner side of endothermis and above the phloem in the form of semi-lunar patches of sclerenchyma.
In the transverse section of the sunflower root of dicotyledonous root , the internal tissue organisation as follows :-
The outermost layer is epidermis.Many of the epidermal cells protrude in the form of unicellular root hairs.
The cortex consists of several layers of thin – walled parenchymatous cells with intercellular spaces. The innermost layer of a cortex is called endodermis.
It comprises a single layer of barrel – shaped cells without any intercellular spaces.
The tangential as well as radial walls of the endodermal cells have a deposition of water impermeable.
EPIDERMAL TISSUE SYSTEM :-
THE EPIDERMAL TISSUE SYSTEM forms the outermost covering of the whole plant body and comprises epidermal cells stomata and the epidermal appendages the trichomes and hairs.
The epidermis is the outermost layer of the primary plant body. It is made up of elongated compactly arranged cells which form a continuous layer. Epidermis is usually single layered. Epidermal cells are parenchymatous with a small amount of cytoplasm lining the cell
wall and a large vacuole.
The outside of the epidermis is often covered with a thick layer called the cuticle which prevents the loss of water.
Cuticle is absent in roots.
Stomata aur structures present in epidermis of the leaves.
Stomata regulate the process of transpiration and gases exchange. Each stoma composed of two bean shaped cells known as guard cells.
Guard cells possess chloroplast and regulate theopening and closing of stomata.
THE COMPLEX TISSUES ARE MADE OF MORE THAN ONE TYPE OF CELLS.
THIS WORK TOGETHER IS A UNIT.
Xylum and phloem constituent the complex tissues in plants.
. PHLOEM :- PHLOEM transports food materials, usually from leaves to other parts of the plants. Phloem in angiosperm is composed of Sieve tube elements, companian cells, phloem parenchyma, and phloem fibres.
Gymnosperms have albuminous cells and sieve cells .They lacks sieve tubes and companion cells.
Sieve tubes elements are also long tube like structures arranged longitudinally and are sieve – like manner to form the sieve plates.
Companion cells :- The companion cells are specialised parenchymatous cells which are closely associated with sieve tubes elements.
PHLOEM Parenchyma :- It is made up of elongated tapering cylindrical cells which have dense cytoplasm and nucleus.
PHLOEM fibers:- it is made up of sclerenchymatous cells.There are generally absent in the primary phloem but are found in the secondary phloem.
XYLEM:-
XYLEM FUNCTION is a conducting tissue for water and minerals from roots to the stem and leaves . It also provides mechanical strength to the plants.
It is composed of four different kinds of elements , tracheids, vessels, xylem fibres , xylem parenchyma.
Gymnosperms lacks vessels in their xylem.
Tracheids are elongated or tube like cells with thick and lignified walls and tapering ends.
These are dead and are without protoplasm.The inner layers of cell walls have thickening which vary in form.
Vessel is along cylindrical tube like structure made of many cells called vessels members each with lignified walls and a large central cavity.
Xylem fibers have highly thickened walls and obliterated central lumens.
XYLEM parenchyma cells are living and thin walled and their cell walls are made up of cellulose.
They store food materials in the form of starch or fat .
The cells of the permanent tissues do not generally divide further. Permanent tissue having all cells similar in structure and functions are called simple tissues.
Permanent tissues having many different types of cells are called complex tissues.
Simple tissues:-a simple tissue is made of only one type of cells. The various simple tissues in plants are parenchyma, collenchyma and Sclerenchyma.
Parenchyma forms the major component within organs. The cells of the parenchyma are generally isodiametric.
They may be spherical , oval , round ,polygonal or elongated in shape.
Their walls are thin and made of cellulose.
They may either be closely packed or have small intercellular spaces.
The Parenchyma performs various functions like photosynthesis storage and secretion.
Collenchyma:-the Collenchyma occurs in layers below the epidermis in dicotyledonous plants.
It is found either as a homogeneous layer or patches.It consist of cells which are much thickened at the corners due to deposition of cellulose , hemicellulose and pectin.
Sclerenchyma:- it consist of long narrow cells with thick and lignified cell walls having a few or numerous pits.They are usually dead and without protoplasts.
MCQ DICOTYLEDONOUS LEAF AND MONOCOTYLEDONOUS LEAF class 11 for NEET/KVS PGT BIOLOGY / NVS PGT BIOLOGY EXAM 2023-2024,2025
1. The vertical section of dorsoventral (Dicotyledonous) leaf through the lamina shows three main parts namely
(a) epidermis
(b) mesophyll
(c) vascular system
(d) All the above
Ans (d) All the above
2. The epidermis which covers both the upper surface adaxial epidermis and lower surface abaxial epidermis of the leaf has a conspicuous
(a) cuticle
(b) parenchyma
(c) Collenchyma
(d) all the above
Ans. (a) cuticle
3. The tissue between the upper and lower epidermis is called the
(a) albuminous cells
(b) mesophyll
(c) xylem and phloem
(d) sieve tubes
Ans. (b) mesophyll
4. Mesophyll which possess chloroplast and carry out photosynthesis is made up of
(a) epidermis
(b) pericycle
(c) conjunctive tissue.
(d) parenchyma
Ans.(d) parenchyma
5. Vascular system includes vascular bundles which can be seen in the …..
(a) hypodermis
(b) veins and midribs
(c) epidermis
(d) sieve tubes elements
Ans.(b) veins and midribs
6.The size of the vascular bundles are dependent on the size of the
(a) companion cells
(b) phloem fibres
(c) casparian strips
(d) veins
Ans.(d) veins
7.The vascular bundles are surrounded by a layer of thick walled
(a) companion cells
(b) guard cells
(c) bundle sheath cells
(d) cortical layers
Ans.(c) bundle sheath cells
8. Palisade and songy parenchyma is found in the
(a) dumb – bell shaped
(b) mesophyll cells
(c) endodermis
(d) circular shape
Ans.(b) mesophyll cells
9.The stomata are present on the both surfaces of the epidermis and mesophyll is not differentiated palisade and songy parenchyma.
(a) monocotyledonous leaf
(b) dicotyledonous leaf
(c) starch sheath
(d) companion cells
Ans. (a) monocotyledonous leaf
10. In grasses certain adaxial epidermal cells along the veins modify themselves into large , empty , colourless cells.These are called
(a) Cortex
(b) epidermis
(c) bulliform cells
(d) monocot stem
Ans. (c) bulliform cells
11.The parallel venation is found in the
(a) parenchyma
(b) medullary rays
(c) phloem parenchyma
(d) monocot leaves
Ans.(d) monocot leaves
12. When the bulliform cells in the leaves have absorbed water and are
a) turgid
b) dicotyledonous root
c) root hairs
(d) flaccid
Ans . (a) turgid
13. When bulliform cells are flaccid due to water stress , they make the leaves curl to
(a) sclerenchymatous cells
(b) dicotyledonous root
(c) monocotyledonous
(d) minimise water loss
An. (d) minimise water loss
14. The adaxially placed palisade parenchyma is made up of
(a) unicellular
(b) innerside of xylem
(c) elongated cells
(d) parenchyma
Ans. (c) elongated cells
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15. The oval or round and loosely arranged spongy parenchyma is situated below the ……..
(a) dicot stem
(b) palisade cells
(c) monocot root
(d) dicot root
Ans.(b) palisade cells
16. The veins vary in the thickness in the reticulate venation of the .. …….
(a) dicotyledonous root
(b) parenchymatous cells
(c) monocotyledonous root
(d) dicot leaves
Ans.(d) dicot leaves
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