Anatomy of Flowering Plants Test

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Anatomy of Flowering Plants Test - 20

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Question 1
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Distinguishing feature of closed vascular bundle is

A
Presence of cambium

B
Absence of cambium

C
Ring of vascular bundles

D
No vascular bundles

Solution

Open vascular bundle contains an interfascicular cambium in between phloem and xylem. Phloem and xylem are not in direct contact with each other.
In closed vascular bundle interfascicular cambium is absent. There is direct contact between phloem and xylem.
Question 2
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A narrow layer consisting of thin-walled cells which separates the wood from phloem in dicot stem is called as

A
Pericycle

B
Cambium

C
Endodermis

D
Phellogen

Solution

A narrow layer consisting of thin-walled cells which separates the wood from phloem in dicot stem is called as cambium. The vascular cambium is a lateral meristem in the vascular tissue of plants. It is a cylinder of unspecialized meristem cells that divide to give rise to cells that differentiate to form the secondary vascular tissues. The vascular cambium is the source of both the secondary xylem and the secondary phloem and is located between these tissues in the stem and root. The cambium present between primary xylem and primary phloem is called as intrafasicular cambium.
Therefore, the correct answer is option B.
Question 3
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In a young dicot stem epidermis is covered by a waxy coating, called as

A
Pectin

B
Suberin

C
Cuticle

D
None of the above

Solution

In a young dicot stem epidermis is covered by a waxy coating, called as cuticle. Cuticle is the waxy coating of the outer walls of epidermal cells of stem. It's function is to protect against excessive water loss, as well as protecting against mechanical injury.
Question 4
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The youngest layer of secondary xylem in a five year old dicot stem is found

A
Just outside the cambium

B
Just inside the cambium

C
Adjacent to pith

D
Adjacent to cortex

Solution

In a dicot stem, by the end of the first year, the primary structure shows the growth of vascular and cork cambiums. The growth of the secondary xylem becomes continuous with the primary xylem. The secondary growth occurs both in the stele and cortex and though simultaneously, is caused by separate strips of secondary meristem. The cambial ring exhibits mitotic activity on both the sides and ones towards the inner surface results in the formation of xylem cells.
Question 5
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Identify the correct statement with reference to pericycle?

A
Distinguished in monocot stems

B
Innermost layer of the cortex

C
Partly sclerenchymatous in roots

D
The seat of origin of lateral roots

Solution

In monocots, cortex is differentiated into hypodermis, general cortex, endodermis and stele is not differentiated into pericycle, vascular bundles, medulla and medullary rays.

Pericycle in roots may be mostly composed of parenchyma cells.

The pericycle regulates the formation of lateral roots by rapidly dividing near the xylem elements of the root. It has been known to often be confused with other parts of the plant.

Thus, the right option is D.
Question 6
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Ground tissue includes

A
All tissues internal to endodermis

B
All tissues external to endodermis

C
All tissues except epidermis and vascular bundles

D
Epidermis and cortex
Solution
Correct option: C
Explanation:
Based upon the type of cell walls, ground tissue is subdivided into- parenchyma, collenchyma and sclerenchyma.
These all are present between the epidermis and the vascular bundles.
Parenchyma cells remain alive on maturation.
Collenchyma and Sclerenchyma cells are mostly dead and have thickenings.
Hence, ground tissue includes "all tissues except epidermis and vascular bundles".
Question 7
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Hypodermis in dicot stem is composed of

A
Parenchyma

B
Collenchyma

C
Sclerenchyma

D
Both (B) and (C)

Solution

Hypodermis is a region lying immediately below the epidermis. It is represented by a few layers of collenchyma cells with angular thickenings. The cells are compactly arranged without any intercellular spaces. Hypodermis provides mechanical support and additional protection. So, hypodermis of a dicot stem is composed of collenchyma and not parenchyma or sclerenchyma.
Thus, the correct answer is option B.
Question 8
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Meristems are not found in:

A
Cycas stem

B
Rose leaf

C
Pollen of Pinus

D
Fern rhizome
Solution
Correct Option: C
Explanation:
- A meristem is a tissue containing undifferentiated cells, found in regions of the plant where growth can take place(such as root, stem, leaf).
- Meristematic cells give rise to various organs of the plant and keep the plant growing by continued cellular division.
- Pollen of Pinus does not have meristems as pollen grain are the gametic cells found in male reproductive organs of plants.
Question 9
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Meristem present at lamina margin is

A
Apical meristem

B
Intercalary meristem

C
Mass meristem

D
Marginal meristem

Solution

A meristem is made of dividing cells. They are in parts of the plant where growth can take place. Marginal meristem is present in leaf margins for growth to occur.
Hence the correct option is D.
Question 10
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A dicot root differs from a monocot root in presence of

A
Piliferous layer

B
Exodermis

C
Under-developed pith

D
Separate vascular bundle

Solution

Pith is very small, with closely packed parenchyma cells in dicot root. In monocot root pith and conjunctive tissue, become lignified and sclerenchymatous and it is relatively large.

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Anatomy of Flowering Plants Test - 20

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Anatomy of Flowering Plants Test - 20

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SHARING IS CARING

Question 1

Presence of cambium

Absence of cambium

Ring of vascular bundles

No vascular bundles

Solution

Question 2

Pericycle

Cambium

Endodermis

Phellogen

Solution

Question 3

Pectin

Suberin

Cuticle

None of the above

Solution

Question 4

Just outside the cambium

Just inside the cambium

Adjacent to pith

Adjacent to cortex

Solution

Question 5

Distinguished in monocot stems

Innermost layer of the cortex

Partly sclerenchymatous in roots

The seat of origin of lateral roots

Solution

Question 6

All tissues internal to endodermis

All tissues external to endodermis

All tissues except epidermis and vascular bundles

Epidermis and cortex

Solution

Question 7

Parenchyma

Collenchyma

Sclerenchyma

Both (B) and (C)

Solution

Question 8

Cycas stem

Rose leaf

Pollen of Pinus

Fern rhizome

Solution

Question 9

Apical meristem

Intercalary meristem

Mass meristem

Marginal meristem

Solution

Question 10

Piliferous layer

Exodermis

Under-developed pith

Separate vascular bundle

Solution

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