Anatomy of Flowering Plants Test

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Anatomy of Flowering Plants Test - 66

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Question 1
1 / -0

In dicot stem, lateral branch comes out from

A
Pericycle

B
Cortex

C
Pith

D
Epidermis

Solution

In dicot stem, the lateral branches are exogenous in origin and they come out from the cortex of the stem. However, in dicot root, the lateral roots are endogenous in origin because they come out from the pericycle of the stem.
A. Pericycle gives rise to the lateral roots.
B. Cortex gives rise to the lateral branches in stem.
C. Pith is a storage organ.
D. Epidermis gives rise to scales and trichomes.
Hence, the correct answer is 'Cortex'
Question 2
1 / -0

Ground tissue includes

A
Cortex and pericycle

B
Pith

C
Medullary ray

D
All of the above

Solution

Correct answer: D
Explanation:
• All other tissue in a plant that isn't dermal or vascular tissue is referred to as ground tissue. It includes parenchyma, collenchyma, and sclerenchyma.
• The pericycle is a region that surrounds the vascular tissues and is made up of one or more layers of cells.
• The parenchymatous ground tissue found between the vascular bundles is known as medullary rays.
• The pith is the layer of tissue between the vascular tissue and the epidermis in a stem or root, and the cortex is the layer of tissue between the vascular tissue and the epidermis.

Hence, ground tissue includes all of the above.
Question 3
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In young dicot stem, cambium is

A
Single layered

B
Double layered

C
Multilayered

D
Absent

Solution

In a young dicot stem, the cambium is single layered. It is made by the intrafascicular cambium present within the vascular bundles and the dedifferentiation of the parenchyma cells of the medullary rays between the vascular bundles, called interfascicular cambium. Their combination gives a circular cambium that produces xylem elements on the inner side and the phloem elements on the outer side.
Hence, the correct answer is 'Single layered'
Question 4
1 / -0

In root-system transition region the vascular bundles are

A
Radial

B
Conjoint

C
Collateral

D
None

Solution

The root-stem transition is the region where the tissues of roots are undergoing transition to form the tissues of stem. This region does not belong to root or stem. The radial vascular bundles are undergoing the process of multiplication, forking and shift from radial vascular bundles of roots to conjoint collateral vascular bundles of the stem. Hence, in this region, radial bundles of roots will not appear perfectly radial and the conjoint collateral vascular bundles will appear at the time when the region will be called the stem and not the transition region.
Hence the correct answer is 'None'.
Question 5
1 / -0

A T.S. of dicot stem is stained with iodine with proper procedure. Which of the following structures are expected to show blue colour?

A
Endodermis

B
Cortex

C
Pericycle

D
Phloem

Solution

Iodine is used to test the presence of starch in the test material. It binds with starch to give a blue colour. The endodermis is the stem of dicot plants is made up of parenchymatous cells and it stores the starch. Therefore, it is also called the starch sheath. When stained with iodine, the endodermis will take up the blue colour due to the presence of starch.
Hence, the correct answer is 'Endodermis'.
Question 6
1 / -0

Which one is false about monocot stem?
I. Vascular bundles is scattered, cojoint, close, surrounded by sclerenchymatous bundle sheath and cavity.
II. Hypodermis is scelerenchymatous.
III. Peripheral vascular bundles is smaller than centrally placed ones.
IV. Ground tissue is differentiated into cortex, pericycle, pith, etc.
V. Homogeneous parenchymatous ground.

A
I, III, IV

B
III, IV

C
IV

D
V

Solution

The monocot stem shows the following characteristics:
I. Vascular bundles are scattered in the ground tissue, conjoint, collateral and they are surrounded by the sclerenchymatous layer of bundle sheath. They have a lysigenous cavity formed by the breakdown of inner protoxylem vessels and parenchyma.
II. The hypodermis is made up of sclerenchymatous cells.
III. The peripheral vascular bundles are smaller in size and are more than the central vascular bundles.
IV. Ground tissue is not differentiated into cortex, pericycle, pith etc.
V. Ground tissue is homogeneous and is made of parenchymatous cells.
Hence, the correct answer is 'Ground tissue is differentiated into cortex, pericycle, pith etc.'
Question 7
1 / -0

Interfascicular cambia originate from cells of

A
Medullary ray

B
Cortex

C
Endodermis

D
Fascicular cambia

Solution

The cells of medullary rays become meristematic to form interfascicular cambium which is secondary lateral meristem. Intrafascicular and interfascicular cambium are collectively known as vascular cambium. Vascular cambium is formed in the form of a complete ring which is made up of a single layer of cells.
So, the correct answer is 'Medullary ray'.
Question 8
1 / -0

In dicot stem, cork cambium develops in

A
Epidermal region

B
Cortical region

C
Stelar region

D
Vascular region

Solution

Cork cambium is secondary or lateral meristematic tissue that grows beneath the epidermis and replaces it in dicot roots and stems and is responsible for the secondary growth of the tree.
So the correct option is 'Epidermal layer'
Question 9
1 / -0

Which of the following statements are the functions of a medullary ray in plants?

A
Storage of food

B
Secondary growth

C
Both of the above

D
None of these

Solution

Medullary ray is a band of parenchyma in the secondary xylem extending into the secondary phloem of the stems of certain vascular plants, formed by the cambium and helps for the storage of food and conduction of nutrients. it helps in the gaseous exchange through the intercellular spaces.
So, the correct answer is 'Storage of food'.
Question 10
1 / -0

When the vascular cambium is present between the xylem and phloem, the vascular bundle is called

A
Closed

B
Open

C
Endarch

D
Exarch

Solution

Xylem and phloem together form vascular bundle. It is of 2 types, simple and compound. The compound vascular bundles are further divided into concentric and collateral. In collateral vascular bundles, xylem and phloem are arranged side by side on the same radius. When the vascular cambium is present between the xylem and phloem, the vascular bundle is called open collateral vascular bundle. Example includes dicot stem. When the vascular cambium is not present between the xylem and phloem, the vascular bundle is called closed collateral vascular bundle. Example includes monocot stem.
Thus, the correct answer is 'Open.'

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Anatomy of Flowering Plants Test - 66

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Anatomy of Flowering Plants Test - 66

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Question 1

Pericycle

Cortex

Pith

Epidermis

Solution

Question 2

Cortex and pericycle

Pith

Medullary ray

All of the above

Solution

Question 3

Single layered

Double layered

Multilayered

Absent

Solution

Question 4

Radial

Conjoint

Collateral

None

Solution

Question 5

Endodermis

Cortex

Pericycle

Phloem

Solution

Question 6

I, III, IV

III, IV

IV

V

Solution

Question 7

Medullary ray

Cortex

Endodermis

Fascicular cambia

Solution

Question 8

Epidermal region

Cortical region

Stelar region

Vascular region

Solution

Question 9

Storage of food

Secondary growth

Both of the above

None of these

Solution

Question 10

Closed

Open

Endarch

Exarch

Solution

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