Tag: internal structure of root, stem and leaf

Questions Related to internal structure of root, stem and leaf

An undifferentiated mesophyll is found in

botany internal structure of root, stem and leaf internal structure of monocot leaf internal structure of leaf (dicot and monocot) anatomy of leaf internal structure of dicot leaf

  1. Isobilateral leaves

  2. Dorsiventral mesophytic leaves

  3. Dorsiventral xerophytic leaves

  4. Vertical leaves

Show answer
Correct Option: A
Explanation:

A.Isobilateral leaves – Mesophyll is undifferentiated, contains spongy parenchyma only.

B.Dorsiventral mesophytic leaves – Mesophyll is differentiated into upper palisade parenchyma and lower spongy parenchyma.

C.Dorsiventral xerophytic leaves – Mesophyll is differentiated into upper and lower palisade parenchyma and middle spongy parenchyma.

D.Vertical leaves - Mesophyll is differentiated into upper and lower palisade parenchyma and middle spongy parenchyma.

So, the correct option is ‘isobilateral leaves’.

Isobilateral leaves have stomata on

botany internal structure of root, stem and leaf internal structure of monocot leaf internal structure of leaf (dicot and monocot) anatomy of leaf internal structure of dicot leaf

  1. Both upper and lower surfaces

  2. Upper surface only

  3. Lower surface only

  4. None of the two surfaces

Show answer
Correct Option: A
Explanation:

In isobilateral leaves or monocot leaves, stomata are present on both upper or adaxial epidermis as well as lower epidermis or abaxial epidermis.

So, the correct option is ‘Both upper and lower surfaces’.

What differentiates a dicot leaf from monocot leaf?

botany internal structure of root, stem and leaf internal structure of monocot leaf internal structure of leaf (dicot and monocot) anatomy of leaf internal structure of dicot leaf

  1. Stomata only on upper side

  2. Differentiation of palisade and spongy parenchyma

  3. Parallel venation

  4. Stomata on upper and lower sides

Show answer
Correct Option: B
Explanation:

Dicot leaf differs from monocot leaf anatomically in terms of presence of more number of stomata in the lower epidermis, presence of differentiated mesophyll,  and vascular bundle.

So, the correct option is 'Differentiation of palisade and spongy parenchyma'.

Isobilateral leaf is characterised by

botany internal structure of root, stem and leaf internal structure of monocot leaf internal structure of leaf (dicot and monocot) anatomy of leaf internal structure of dicot leaf

  1. Similarly green two surfaces

  2. Amphistomatic nature

  3. Undifferentiated mesophyll

  4. All the above

Show answer
Correct Option: A
Explanation:

Leaf, in which both surfaces are similar in appearance are called isobilateral leaves. These are found in monocotyledons. It is due to the presence of spongy parenchyma.

So, the correct option is ‘Similarly two green surfaces’.    

Which one describes the correct features of plant leaves?

botany internal structure of root, stem and leaf internal structure of monocot leaf internal structure of leaf (dicot and monocot) anatomy of leaf

  1. Hair on the lower surface and waxy cuticle

  2. Hair on the upper surface an no cuticle

  3. Epidermis without stomata

  4. Presence of endodermis and casparian strips

Show answer
Correct Option: A
Explanation:

  • Leaves have a layer of waxy cuticle on their surface as it helps in preventing water loss due to excess transpiration. The leaves may also have hair on the lower surface which act as trichomes and protect the surface of the leaves.
  • The epidermis of the leaves has minute pores called stomata through which gaseous exchange takes place.
  • Endodermis and Casparian strips are present in the roots of the plants.
So, the correct answer is 'Hair on the lower surface and waxy cuticle'.

Which one is correct about bulliform/ motor cell?

botany internal structure of root, stem and leaf internal structure of monocot leaf internal structure of leaf (dicot and monocot) anatomy of leaf

  1. It is seen in grasses.

  2. It is large-sized, colorless, vacuolate cells on the adaxial surface of monocot leaf.

  3. Both of the above

  4. None of the above

Show answer
Correct Option: C
Explanation:

Bulliform cells or the motor cells are the modified epidermal cells present on the upper surface or the adaxial surface of the monocot leaf (the grasses). They are colourless, large-sized and vacuolated cells. They regulate the rolling of leaves to prevent the loss of water. When water is adequately present, they become turgid and keep the leaf open and exposed. When there is scarcity of water, the become flaccid and roll-up the leaf to prevent the loss of water.

Hence, the correct nswer is 'Both of the above'

The number of xylem bundles in monocot roots are:

botany internal structure of root, stem and leaf internal structure of monocot root internal structure of root(dicot and monocot) anatomy of root

  1. 1

  2. 2

  3. 4

  4. 8

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Correct Option: A

Monocotyledonous root differs from dicot root in which of the following internal features (a to d)?


a. Presence of parenchymatous pericycle
b. Absence of fewer xylem bundles
c. Presence of large and well-developed pith
d. Presence of parenchymatous cortex without intercellular spaces

Find out the correct option.

botany internal structure of root, stem and leaf internal structure of monocot root internal structure of root(dicot and monocot) anatomy of root

  1. a, c, & d

  2. b & d

  3. b & c

  4. a & d

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Correct Option: A

Read the  following statements and choose the correct option. 
a) Pith is large and well developed in roots of monocot plants.
b) Bundle sheath is  presents in dicot stem.
c) Water containing cavities are present within vascular bundles of monocot stem.

botany internal structure of root, stem and leaf internal structure of monocot root internal structure of root(dicot and monocot) anatomy of root

  1. Only (b) is incorrect

  2. Only (a) is incorrect

  3. Only (a) and (b) are correct

  4. All (a), (b) and (c) are correct

Show answer
Correct Option: A
Explanation:

 In dicot stem, bundle sheath is absent, while in monocot stem the bundle sheath is present as it surrounds the scattered vascular bundles. So the correct option is 'Only (b) is incorrect'.

A typical monocotyledonous root is characterized by 

botany internal structure of root, stem and leaf internal structure of monocot root internal structure of root(dicot and monocot) anatomy of root

  1. Usually more than six xylem bundles

  2. Large and well developed pith

  3. No secondary growth

  4. All of the above

Show answer
Correct Option: D
Explanation:
A typical monocotyledonous root can be characterized by :-
1) The xylem shows a polyarch condition where it forms numerous groups or bundles (usually 12 to 21).
2) The cambium is absent in all the stages and there is no secondary thickening in such roots.
3) The pith is large and well developed.
So, the correct answer is 'All of the above'.