Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

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

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

  1. Leaves with reticulate venation

  2. Taproot system

  3. Vascular bundles are closed

  4. Presence of cambium
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. Monocot stem

  2. Monocot root

  3. Dicot stem

  4. Dicot root
Reveal answer Fill a bubble to check yourself
A Correct answer
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.  

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

Hypodermis in monocotyledonous stem is?

  1. Parenchymatous

  2. Chlorenchymatous

  3. Collenchymatous

  4. Sclerenchymatous
Reveal answer Fill a bubble to check yourself
D Correct answer
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’.

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

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

  1. Bicollateral vascular bundles

  2. Conjoint vascular bundles

  3. Scattered vascular bundles

  4. Cambium in the vascular bundles
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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

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

Undifferentiated ground tissue is present in stem of

  1. Sunflower

  2. Pisum

  3. Maize

  4. Cucurbita
Reveal answer Fill a bubble to check yourself
C Correct answer
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’.

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

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

  1. Radial

  2. Scattered

  3. Enclosed by sclerenchyma

  4. Closed
Reveal answer Fill a bubble to check yourself
D Correct answer
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’.

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

Grafting is not possible in monocots because they

  1. Lack cambium

  2. Have scattered vascular bundles

  3. Have parallel venation

  4. Are herbaceous
Reveal answer Fill a bubble to check yourself
A Correct answer
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’

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

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

  1. Monocot stem

  2. Dicot stem

  3. Monocot root

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

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

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

  1. Sclerenchymatous bundle sheath

  2. Lysigenous cavity

  3. Sclerenchymatous hypodermis

  4. Starch sheath
Reveal answer Fill a bubble to check yourself
D Correct answer
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’.