Tag: internal structure of root, stem and leaf

Questions Related to internal structure of root, stem and leaf

Many grass leaves are capable of folding and unfolding due to

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. Parallel veins

  2. Isobilateral nature

  3. Thin lamina

  4. Bulliform cells

Show answer
Correct Option: D
Explanation:

Many grass leaves, folds during drought conditions and unfolds during moisturized conditions. It is due to the presence of large, thin-walled cells present on the adaxial side of the upper epidermis, called Bulliform cells.

So, the correct option is ‘Bulliform cells’.

Ligule occurs on the leaf of

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. Barley

  2. Oat

  3. Rice

  4. All of the above

Show answer
Correct Option: D
Explanation:

The ligule is a part of the leaf that is found at the junction of the leaf blade and sheath of the leaf. It may take several forms. But commonly, it is a translucent membrane or a fringe of hairs. It is seen in plants belonging to the family Poaceae. Hence, ligule occurs on the leaf of Barley, Oat and Rice.

So, the correct answer is 'All of the above'.

Leaves of many grasses are capable of folding and unfolding because they

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. Are very thin

  2. Are isobilateral

  3. Have specialised bulliform cells

  4. Have parallel vascular bundles

Show answer
Correct Option: C
Explanation:

Grasses have monocot leaves. Leaves of grasses have specialized bulliform cells on the upper epidermis. These bulliform cells are capable of folding and unfolding of leaves to help in the process of transpiration. 

Thus, the correct answer is option C.

Monocot leaves possess

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. Intercalarly meristem

  2. Lateral meristem

  3. Apical meristem

  4. Mass meristem

Show answer
Correct Option: A
Explanation:
  • The shoots can be categorized as long shoots and short shoots (on the basis of the distance between two nodes).
  • Internode is the length of the stem between two nodes.
  • The variable length of internodes in culm of sugarcane is mainly due to the presence of intercalary meristem (residual apical meristem).
  • An intercalary meristem is the meristems present at the base of the internodes of stem or leaf.
  • It helps in the elongation and growth of the plants at the nodes and internodes (stems and leaves).
  • In monocots such as in grasses it enables longitudinal growth of the leaves and in hollow stem or culm of bamboo and sugarcane, it helps in increasing the length of the stems.
  • So, the correct answer is 'Intercalary meristem'.

In grass, ligule occurs 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. Sheathing leaf base

  2. Leaf blade

  3. Petiole

  4. Between sheathing leaf base and leaf blade

Show answer
Correct Option: D
Explanation:

A ligule is a thin outgrowth which is found at the junction of sheathing leaf base (leaf base is broad and surrounds the stem as an envelope) and leaf blade. It is commonly a form of a translucent membrane or a fringe of hairs. The ligule appears to be a continuation of the leaf sheath and encircles the stem as done by the leaf sheath.

So, the correct answer is 'Between sheathing leaf base and leaf blade'.

Amphistomatic leaf, with stomata distributed equally on both the surfaces, is an example of ______________.

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 leaf

  2. Dorsiventral leaf

  3. Xerophytic leaf

  4. Hydrophytic leaf

Show answer
Correct Option: A
Explanation:

Leaf having stomata equally distributed on both surfaces is called amphistomatic (isobilateral) leaf, e.g., most monocot leaves.

Bundle sheath extensions in a dicot leaf and in a monocot leaf are ________ and ________ respectively.
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. Parenchymatous, Collenchymatous

  2. Parenchymatous, Sclerenchymatous

  3. Sclerechymatous, Parenchymatous

  4. Collenchymatous, Sclerenchymatous

Show answer
Correct Option: B
Explanation:
  • In dicot leaf, bundle sheath is generally single-layered and formed of colourless cells. Bundle sheath extensions are parenchymatous. 
  • In monocot leaf, bundle sheath may be single or double layered and the cells generally possess chloroplasts. Bundle sheath extensions are sclerenchymatous.
Thus, the correct option is (B).

Bulliform or motor cells are present 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. Root

  2. Stem

  3. Isobilateral leaf

  4. Dorsiventral leaf

Show answer
Correct Option: C
Explanation:

The large sized, thin-walled, water containing colourless epidermal cells present on the adaxial epidermis of an isobilateral leaf or monocot leaf are called bulliform cells.

So, the correct option is ‘Isobilateral leaf’.

Bulliform cells differ from other cells in being

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. Large, thin-walled, vacuolate containing water

  2. Large, thick-walled, contain abundant chloroplasts

  3. Small, thick-walled, contain starch

  4. Small, thin-walled, contain calcium oxalate

Show answer
Correct Option: A
Explanation:

The large sized, thin-walled, vacuolated, water containing colourless epidermal cells present on the adaxial epidermis of an isobilateral leaf or monocot leaf are called Bulliform cells. They differ from other cells in being size, structure and function.

So, the correct option is ‘large, thin-walled, vacuolated containing water’

Which of the following is true about a 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. Reticulate venation

  2. Absence of bulliform cells from epidermis

  3. Mesophyll not differentiated into palisade and spongy tissues

  4. Well differentiated mesophyll

Show answer
Correct Option: C
Explanation:

In the monocot leaf, mesophyll is undifferentiated, shows spongy parenchyma with oval-shaped cells.

So, the correct option is ‘Mesophyll not differentiated into palisade and spongy tissues'.