Tag: botany

Questions Related to botany

Which of the following would you consider to prove that a plant is a monocot?

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

  1. Leaves with reticulate venation

  2. Taproot system

  3. Vascular bundles are closed

  4. Presence of cambium

Show answer
Correct Option: C
Explanation:

In the monocots, the vascular bundles are of the collateral and closed type. The closed vascular bundles lack the cambium and cannot show secondary growth. In the stem, vascular bundles are found scattered in the ground tissue. They are more in number at the periphery as compared to the centre. In the monocot roots, the vascular bundles are closed type an found in the stele.

Conjoint and closed vascular bundles with no phloem parenchyma may be observed in

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

  1. Monocot stem

  2. Monocot root

  3. Dicot stem

  4. Dicot root

Show answer
Correct Option: A
Explanation:

In monocot stem, all the vascular bundles, the xylem and phloem are in the same line; cambium is absent; phloem is external to xylem; protoxylem faces the centre. Hence, the vascular bundles are described as conjoint, collateral, endarch and closed.  

Hypodermis in monocotyledonous stem is?

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

  1. Parenchymatous

  2. Chlorenchymatous

  3. Collenchymatous

  4. Sclerenchymatous

Show answer
Correct Option: D
Explanation:

The region present below the epidermis in monocot stem is hypodermis. It is composed with sclerenchyma. Sclerenchyma is dead mechanical tissue. It provides mechanical strength to the stem.

So, the correct option is 'Sclerenchyma’.

In monocot stem, which among the following is absent?

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

  1. Endodermis

  2. Hypodermis

  3. Cortex

  4. Both A and B

Show answer
Correct Option: A
Explanation:

In monocot stem, the endodermis is absent. It has a single layer epidermis. The vascular bundles are scattered.

Thus, the correct answer is option A.

T.S. of stem of Cucurbita can be identified from the T.S. of sunflower stem by the presence of

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

  1. Bicollateral vascular bundles

  2. Conjoint vascular bundles

  3. Scattered vascular bundles

  4. Cambium in the vascular bundles

Show answer
Correct Option: A
Explanation:

The vascular bundles of cucurbita are many, conjoint, bicollateral, regularly arranged forming a broken ring or scattered in ground tissue and are endarch.

Undifferentiated ground tissue is present in stem of

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

  1. Sunflower

  2. Pisum

  3. Maize

  4. Cucurbita

Show answer
Correct Option: C
Explanation:

A.Sunflower – Ground tissue is differentiated into hypodermis, general cortex and endodermis, pericycle, medulla and medullary rays.

B.Pisum - Ground tissue is differentiated into hypodermis, general cortex and endodermis, pericycle, medulla and medullary rays.

C.Maize – Ground tissue is undifferentiated.

D.Cucurbita - Ground tissue is differentiated into hypodermis, general cortex and endodermis, pericycle, medulla and medullary rays.

So, the correct option is ‘Maize’.

Secondary growth does not occur in monocots as their vascular bundles are

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

  1. Radial

  2. Scattered

  3. Enclosed by sclerenchyma

  4. Closed

Show answer
Correct Option: D
Explanation:

Secondary growth does not take place in monocotyledons, because of the absence of cambium between xylem and phloem in vascular bundles. These vascular bundles are called closed vascular bundles.

So, the correct option is ‘Closed’.

Grafting is not possible in monocots because they

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

  1. Lack cambium

  2. Have scattered vascular bundles

  3. Have parallel venation

  4. Are herbaceous

Show answer
Correct Option: A
Explanation:

In monocot stem, cambium is absent in the vascular bundles. Due to this, grafting is not possible in monocot stem

So, the correct answer is ‘Lack cambium’

Conjoint and closed vascular bundles with no phloem parenchyma are observed in

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

  1. Monocot stem

  2. Dicot stem

  3. Monocot root

  4. Dicot root

Show answer
Correct Option: A
Explanation:

A.Monocot stem - conjoint, closed vascular bundles are present, in which phloem parenchyma is absent in the phloem.

B.Dicot stem - Conjoint, open vascular bundles are present, in which phloem parenchyma is present in the phloem.
C.Monocot root - Radial vascular bundles are present, in which phloem parenchyma is absent.
D.Dicot root - Radial vascular bundles are present, in which phloem parenchyma is present.
So, the correct option is 'Monocot stem'.

Which of the following characters is not found in the transverse section of monocot stem?

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

  1. Sclerenchymatous bundle sheath

  2. Lysigenous cavity

  3. Sclerenchymatous hypodermis

  4. Starch sheath

Show answer
Correct Option: D
Explanation:

The anatomy of monocot stem shows outer single layered epidermis with cuticle and stomata, sclerenchymatous hypodermis, large, wide parenchymatous ground tissue. In this vascular bundles are scatteredly arranged. So the stele is called Atactostele. Vascular bundles are outerly surrounded by sclerenchymatous fibres. So they are called fibrovascular bundles and are collateral, conjoint, closed with endarch xylem. Protoxylem lacuna is present. General cortex, endodermis, pericycle, medulla and medullary rays are absent.

So, the correct option is ‘Starch sheath’.