Tag: internal structure of monocot leaf

Quizzes (0) Questions (53)

Questions Related to internal structure of monocot leaf

Multiple choice 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

An undifferentiated mesophyll is found in

  1. Isobilateral leaves

  2. Dorsiventral mesophytic leaves

  3. Dorsiventral xerophytic leaves

  4. Vertical leaves
Reveal answer Fill a bubble to check yourself
A Correct answer
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’.

Multiple choice 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

Isobilateral leaves have stomata on

  1. Both upper and lower surfaces

  2. Upper surface only

  3. Lower surface only

  4. None of the two surfaces
Reveal answer Fill a bubble to check yourself
A Correct answer
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’.

Multiple choice 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

What differentiates a dicot leaf from monocot leaf?

  1. Stomata only on upper side

  2. Differentiation of palisade and spongy parenchyma

  3. Parallel venation

  4. Stomata on upper and lower sides
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

Multiple choice 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

Isobilateral leaf is characterised by

  1. Similarly green two surfaces

  2. Amphistomatic nature

  3. Undifferentiated mesophyll

  4. All the above
Reveal answer Fill a bubble to check yourself
A Correct answer
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’.    

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

Which one describes the correct features of plant leaves?

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

Which one is correct about bulliform/ motor cell?

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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'

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

In a typical leaf palisade parenchyma is present

  1. On the abaxial side

  2. On the adaxial side

  3. In the middle of the leaf

  4. In the petiole of the leaf
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Palisade parenchyma cells are plant cells found within the mesophyll in leaves, right below the upper epidermis and cuticle. They are vertically elongated, a different shape from spongy mesophyll cells beneath them in the leaf. Their chloroplasts absorb a major portion of the light energy used by the leaf. 

Palisade cells occur in dicotyledonous plants and also in the net-veined monocots. Pallisade cells are present on the adaxial side that is the upper side of leaf.

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

The types of parenchyma cells present in dicot leaf are

  1. Palisade

  2. Spongy

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Palisade cells are plant cells found within the mesophyll in leaves, right below the upper epidermis and cuticle. They are vertically elongated, a different shape from spongy mesophyll cells beneath them in the leaf. Their chloroplasts absorb a major portion of the light energy used by the leaf. Palisade cells occur in dicotyledonous plants and also in the net-veined monocots. The spongy mesophyll are usually ball-shaped with large intercellular spaces but usually contains fewer chloroplasts than the palisade cells. They are also present in dicot leaf. 

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

In floating leaved plants stomata occur on

  1. Lower surface

  2. Upper surface

  3. Both surfaces

  4. Absent
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Stomata is a pore, found in the epidermis of leaves, used to control gas exchange. The pore is bordered by a pair of specialized parenchyma cells, known as guard cells that are responsible for regulating the size of the opening. Stomata are present in the sporophyte generation of all land plant groups except liverworts. 

Dicotyledons usually have more stomata on the lower epidermis than the upper epidermis. 
In plants with floating leaves, stomata may be found only on the upper epidermis and submerged leaves may lack stomata entirely.

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

The differentiation of Palisade tissue and spongy parenchyma is found in ______________.

  1. Isobilateral

  2. Dorsiventral leaves

  3. Both

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Dorsiventral leaf i.e. Mesophyll is the ground tissue and it occurs between the two epidermal layers. It is heavily composed of chlorenchyma cells. The mesophyll is differentiated into two regions an upper palisade parenchyma and lower spongy parenchyma. Palisade parenchyma is again composed of two or three layers of elongated and compactly arranged chlorenchyma cells.

Also, the isobilateral leaf has undifferentiated mesophyll.

Therefore, the correct answer is option B.