Anatomy of Flowering Plants Test

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Anatomy of Flowering Plants Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

Exarch xylem is found in

A
Root

B
Stem

C
Leaf

D
Rachis

Solution

Exarch xylem is the arrangement in which the protoxylem (the first formed primary xylem cells in a plant shoot/root) is directed towards the periphery and the metaxylem (later formed primary xylem cells in a plant shoot/root) is directed towards the centre. Its development follows a centripetal pattern and is characteristics of roots.
Thus, the correct answer is option A.
Question 2
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Which of the following is seen in a monocot root?

A
Large pith

B
Vascular cambium

C
Endarch xylem

D
Medullary ray

Solution

In monocot root, the vascular bundles are usually more than six in number. Pith is large and parenchymatous. The parenchyma of the pith become lignified and sclerenchymatous.
Question 3
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Collenchyma generally occurs

A
Scattered in dicot roots

B
In a ring in monocot roots

C
In patches under epidermis in dicot stem

D
In all of the above

Solution

The hypodermis is found below the epidermis in dicot stem and is constituted with angular collenchyma which is 3-5 layered. Pericycle consists of alternately arranged patches of sclerenchyma and parenchyma.
Thus, the correct answer is option C.

Question 4

1 / -0

Monocot root differs from dicot root in

Presence of more than six xylem bundle

Well developed pith

Absence of secondary growth

All of the above

Solution

Tissue/organ	Dicot root	Monocot root
Vascular bundles	Diarch to hexarch, open bundle	Polyarch, closed
Pith	Small or absent	Relatively large
Cambium	Conjunctive tissue becomes meristematic and results in secondary growth	Conjunctive tissue does not become a meristem and complete absence of secondary growth
Pericycle	It may give rise to cork cambium and lateral branches	It may give rise to only lateral branches

Hence they differ in all the aspects listed. Thus, the correct option is D.

Question 5
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Vascular bundles in dicot stem are

A
Conjoint and collateral

B
Conjoint and closed

C
Conjoint, collateral and open

D
Collateral and open

Solution

Correct Option: C
Explanation:
In the dicot stem, the vascular bundles are conjoint, collateral and open. In the case of monocot stems, the vascular bundles are arranged in the bundles of xylem and phloem and are dispersed throughout the ground tissue. The vascular bundle in the monocot stem is conjoint, bicollateral and open.
Question 6
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In monocot stem, which among the following is absent?

A
Endodermis

B
Hypodermis

C
Cortex

D
Both A and B

Solution

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.
Question 7
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T.S. of stem of Cucurbita can be identified from the T.S. of sunflower stem by the presence of

A
Bicollateral vascular bundles

B
Conjoint vascular bundles

C
Scattered vascular bundles

D
Cambium in the vascular bundles

Solution

The vascular bundles of cucurbita are many, conjoint, bicollateral, regularly arranged forming a broken ring or scattered in ground tissue and are endarch.
Question 8
1 / -0

Origin of lateral root in secondary root is

A
Exogenous

B
Endogenous

C
Lysigenous

D
Schizogenous

Solution

Lateral root primordia originate from the mature pericycle of the parent root. One of the first events is a periclinal division that generates a double layer of pericycle derived cells. Cells of the primordia begin to differentiate almost immediately after initiation, as evidenced by differential gene expression in the inner and outer layers. An endogenous lateral branch develops from pericycle and passes through the cortex. Thus, the correct answer is option B.
Question 9
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Sclerenchymatous sheath is present in vascular bundles

A
Monocot root

B
Dicot root

C
Dicot stem

D
Monocot stem

Solution

In the monocot stem, hypodermis constitutes the exterior ground tissue, and is composed of 2 3 layers of sclerenchyma tissue.
Question 10
1 / -0

Conjoint, collateral and closed vascular bundle is found in

A
Monocot stem

B
Monocot root

C
Dicot stem

D
Dicot root

Solution

The central vascular bundles of monocot stem are large sized. The xylem and phloem are in the same line, cambium is absent, phloem is external to xylem, protoxylem faces the center. Hence, the vascular bundles are described as conjoint, collateral, endarch and closed.
Thus, the correct answer is option A.

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Anatomy of Flowering Plants Test - 17

Result

Anatomy of Flowering Plants Test - 17

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SHARING IS CARING

Question 1

Root

Stem

Leaf

Rachis

Solution

Question 2

Large pith

Vascular cambium

Endarch xylem

Medullary ray

Solution

Question 3

Scattered in dicot roots

In a ring in monocot roots

In patches under epidermis in dicot stem

In all of the above

Solution

Question 4

Presence of more than six xylem bundle

Well developed pith

Absence of secondary growth

All of the above

Solution

Question 5

Conjoint and collateral

Conjoint and closed

Conjoint, collateral and open

Collateral and open

Solution

Question 6

Endodermis

Hypodermis

Cortex

Both A and B

Solution

Question 7

Bicollateral vascular bundles

Conjoint vascular bundles

Scattered vascular bundles

Cambium in the vascular bundles

Solution

Question 8

Exogenous

Endogenous

Lysigenous

Schizogenous

Solution

Question 9

Monocot root

Dicot root

Dicot stem

Monocot stem

Solution

Question 10

Monocot stem

Monocot root

Dicot stem

Dicot root

Solution

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