Anatomy of Flowering Plants Test

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Anatomy of Flowering Plants Test - 45

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Question 1
1 / -0

In spring(rainy summer), the activity of vascular cambium is

A
More

B
Less

C
Normal

D
None of the above

Solution

In the plants growing temperate regions, the activity of vascular cambium is influenced by existence of maximum seasonal variations. In the spring or early summer, due to the existence of favourable conditions, large amount of secondary xylem is formed. it is called Spring wood or early wood. In the autumn season, due to the presence of unfavourable conditions, less amount of wood is formed. it is called autumn wood or late wood.
So, the correct option is 'more'.
Question 2
1 / -0

Summit of shoot apical meristem shows maximum activity during the formation of

A
Individual leaves

B
Whorl of leaves

C
Floral bud

D
Prior to undergoing dormancy
Solution
- The shoot apical meristem (SAM) is that part of the shoot which is composed of meristematic cells.
- The vegetative shoot apex consists of two regions i.e, summit and flank.
1. Summit- The rate of division is slow and it is located at the apex.
2. Flank- The rate of division is very fast and it lies behind the summit.
- The cells at the summit of shoot apical meristem act as the stem cells to the surrounding peripheral region.
- The growth rates at the meristem summit are different from the cells at the periphery.
- At the peripheral zone, new lateral organs are formed i.e, a restricted number of cells proliferates and grows which results in the formation of outgrowing leaf primordium.
- Thus, they show maximum activity during the formation of leaf primordium.
- So, the correct answer is 'Individual leaves'.
Question 3
1 / -0

Dicot root differs from monocot root in

A
Fewer number of radial vascular bundles with small pith

B
Large number of radial vascular bundles with large pith

C
Fewer number of radial vascular bundles with large pith

D
Large number of radial vascular bundles with small pith

Solution

Dicot root differs from monocot root in the activity of pericycle, no.of xylem strands, the presence of medulla and the activity of conjunctive tissue. In dicot root, pericycle is involved in secondary growth, 2 to 4 vascular bundles are present, and small pith as compared with monocot root.

So, the correct option is ‘fewer number of radial vascular bundles with small pith’.
Question 4
1 / -0

Leaf primordium grows by

A
Apical meristem

B
Intercalary meristem

C
Mass meristem

D
Both A and B
Solution
There are three types of meristems in plants, the apical meristem, the intercalary meristem and the lateral meristem.
Leaves are formed by the shoot apical meristem (SAM).
The SAM swells to form the leaf primordium (undifferentiated tissue) which divides to form the leaf blades and the leaf sheaths.
The leaf blades undergo cell division and get elongated.
The flattened blade is formed by the marginal meristem present at the margins of the leaf axis.
Meristem present on the sides increases the girth of the plant and is called lateral meristem (no role in leaf formation).
So, the correct answer is 'Apical meristem'.
Question 5
1 / -0

Cambium is lateral meristem that takes part in ________.

A
Internodal growth

B
Axial growth

C
Growth of branches

D
Increasing girth of stem and root
Solution
The lateral meristems can be defined as the meristems present on the lateral side of the central longitudinal axis of the stem or the root of a plant.
They are responsible for secondary growth in plants i.e, increase in the thickness or girth of the plant.
The lateral meristems are of two types- vascular cambium and the cork cambium.
Vascular cambium is also known as fascicular cambium which develops within the vascular bundles that produce xylem to the inner side and phloem to the outer side.
1) When the cambial layer which is formed within the vascular bundles in the stems of a plant which forms a ring of tissues it is called the interfascicular cambium.
2) The cambial layer present between the primary xylem and primary phloem is called the intrafascicular cambium.
The cork cambium is also known as phellogen that forms a layer of cells which produces a secondary protective layer of the stem called the periderm.
So, the correct answer is 'Increasing girth of stem and root'.
Question 6
1 / -0

Shoot apical meristem occurs over the tip of ________

A
Root

B
Radicle

C
Plumule

D
Mesocotyl

Solution

Shoot apical meristem occurs over the tip of the plumule.
When a seed starts to germinate, the shoot apical meristem is exposed which leads to the production growth of the plant above the ground.
Question 7
1 / -0

Procambium and ground meristem are first observed anatomically in ________.

A
Zone of primordial initials

B
Determination zone

C
Differentiation zone

D
Between A and B

Solution

Procambium and ground meristem are first observed anatomically in a zone of primordial initials.
Procambium lies just inside of the protoderm and develops into primary xylem and primary phloem.
Question 8
1 / -0

Oldest part of phloem in a dicot stem is situated just.

A
Outside vascular cambium

B
Inner to primary cortex

C
Inner to vascular cambium

D
Between periderm and primary cortex

Solution

In dicot stem during secondary growth, the oldest part of xylem situated towards outer to the medulla and oldest phloem is situated just towards inner to the primary cortex.

So, the correct option is ‘Inner to primary cortex’.
Question 9
1 / -0

Cortex lies between

A
Epidermis and endodermis

B
Endodermis and pith

C
Hypodermis and endodermis

D
Epidermis and stele

Solution

Cortex is middle region of the root and dicot stem, present between epidermis and stele.
So, the correct option is 'epidermis and stele'.
Question 10
1 / -0

Multiseriate vascular rays are present opposite the protoxylem in old

A
Dicot stems

B
Dicot roots

C
Monocot stems

D
Monocot roots

Solution

The non-vascular strips developed radially in the secondary vascular tissues are called vasculary rays or secondary medullary rays. These are multiseriate, homo or heterocellular. Each vascular ray is a combination of xylem ray and phloem ray.

So, the correct option is ‘Dicot stems’.

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Anatomy of Flowering Plants Test - 45

Result

Anatomy of Flowering Plants Test - 45

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SHARING IS CARING

Question 1

More

Less

Normal

None of the above

Solution

Question 2

Individual leaves

Whorl of leaves

Floral bud

Prior to undergoing dormancy

Solution

Question 3

Fewer number of radial vascular bundles with small pith

Large number of radial vascular bundles with large pith

Fewer number of radial vascular bundles with large pith

Large number of radial vascular bundles with small pith

Solution

Question 4

Apical meristem

Intercalary meristem

Mass meristem

Both A and B

Solution

Question 5

Internodal growth

Axial growth

Growth of branches

Increasing girth of stem and root

Solution

Question 6

Root

Radicle

Plumule

Mesocotyl

Solution

Question 7

Zone of primordial initials

Determination zone

Differentiation zone

Between A and B

Solution

Question 8

Outside vascular cambium

Inner to primary cortex

Inner to vascular cambium

Between periderm and primary cortex

Solution

Question 9

Epidermis and endodermis

Endodermis and pith

Hypodermis and endodermis

Epidermis and stele

Solution

Question 10

Dicot stems

Dicot roots

Monocot stems

Monocot roots

Solution

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