Anatomy of Flowering Plants Test

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Anatomy of Flowering Plants Test - 55

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Question 1
1 / -0

Leaf primordium grows by

A
Apical meristem

B
Intercalary meristem

C
Mass maristem

D
Both A and B
Solution
- The meristems in plants can be divided into 3 types- 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 2
1 / -0

In Quercus, phellogen develops from

A
Epidermis

B
Hypodermis

C
Outer cortex

D
Pericycle

Solution

Quercus phellogen develops in the first year of growth in the cell layer under the epidermis and then divide to form 3 to 6 suberized cells.
So the correct option is 'Epidermis'.
Question 3
1 / -0

Phellogen arises from

A
An outer layer of cortex

B
Epidermis

C
Phloem

D
All of the above

Solution

Phellogen also called cork cambium is the secondary meristematic tissue which gives rise to the secondary growth of a plant and divided into phellem which is the outer layer and phelloderm is the inner layer also called secondary cortex all these three combine to form the periderm
So, the correct answer is 'An outer layer of cortex'
Question 4
1 / -0

Vascular cambium of dicot stem is

A
Apical meristem

B
Intercalary meristem

C
Lateral meristem

D
Secondary meristem
Solution
- In vascular plants, the secondary growth occurs due to the activity of the two lateral meristems- the cork cambium and the vascular cambium.
- In woody plants, the secondary growth produces wood and gives shapes to the plant with a thickened trunk.
- The secondary growth develops a cork cambium and vascular cambium.
- The cork cambium forms the thickened cork cells which protect the surface of the plant and also reduces water loss.
- 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.
- In dicots, the fascicular and interfascicular cambium combine together to form a continuous ring called the vascular cambium.
- So, the correct answer is 'Lateral meristem'
Question 5
1 / -0

In Casuarina, the root apical meristem has sets of initials

A
Four

B
One

C
Three

D
Two
Solution
- Casuarina is a genus of oak tree species belonging to the family Casuarinaceae.
- They are also known as ironwoods.
- All the cells in the structure of roots can be traced back to few apical cells which are called initials.
- In Casuarina, only two rows of initials are observed at the root apex.
- One of the layers gives rise to the stele and the other to the cortex and root cap.
- So, the correct answer is 'Two'.
Question 6
1 / -0

Wound cambium is

A
Secondary cambium

B
Inducible cambium

C
Lateral cambium

D
All of the above
Solution
- A cambium formed within a masses of cells (callus) which grow over the injured surface of a wound to heal and repair is called a wound cambium.
- When any part of a plant gets injured a wound is formed in that region.
- The wound is raised due to the formation of callus which is composed of parenchyma cells.
- These living parenchyma cells of wound forms a cambium (wound cambium) which also known as an inducible cambium.
- This wound cambium forms cork towards the outer side which covers the wound entirely formed from a secondary lateral meristem.
- So, the correct answer is 'All of the above'.
Question 7
1 / -0

Interfascicular cambium is

A
Intercalary meristem

B
Secondary meristem

C
Apical meristem

D
Both A and B
Solution
- The cambial layer formed between the two vascular bundles is known as interfascicular cambium.
- They are actively dividing cells which produce xylem towards the inner side and phloem to the outer side hence, it increases the thickness or girth of the plant, therefore, it is a secondary meristem.
- In dicots, the fascicular and interfascicular cambium combine together to form a continuous ring called the vascular cambium.
So, the correct answer is 'Secondary meristem'
Question 8
1 / -0

A nectar secreting gland cell has

A
Vacuolated cytoplasm with large nucleus

B
Granular non-vacuolated cytoplasm

C
Peripheral granular cytoplasm with small nucleus

D
Granular non-vacuolated cytoplasm with a conspicuous nucleus

Solution

Nectaries are the excretory glands (that exude their secretion and do not store it) which are characterized by presence of rich granular cytoplasm in protoplast, lack vacuoles and has conspicuous nucleus (Conspicuous nucleus means that the nucleus is quite prominent and easily stands out when you observe the structure of the respective cell).
So, the correct answer is 'Granular non-vacuolated cytoplasm with a conspicuous nucleus.'
Question 9
1 / -0

A leptocentric or amphivasal vascular bundle has

A
Phloem flanked by xylem on interior and exterior sides only

B
Xylem flanked by phloem on interior and exterior sides only

C
Xylem surrounded by phloem

D
Phloem surrounded completely by xylem

Solution

Concentric vascular bundle - One vascular element surrounds the other on all sides. It is of two types : Amphivasal or leptocentric vascular bundle and Amphicribal or Hydrocentric vascular bundle.
In Amphivasal or leptocentric vascular bundle the xylem is seen towards the outer side which surrounds the phloem. Example : Dracena, Yucca.
So, the correct answer is 'Phloem surrounded completely by xylem.'
Question 10
1 / -0

A vascular bundle having phloem on both sides of xylem is

A
Conjoint collateral

B
Radial

C
Concentric

D
Conjoint bicollateral.

Solution

A group of xylem and phloem forms a vascular bundle. In conjoint vascular bundle the xylem and phloem are on the same radii. Bicollateral is a type of conjoint vascular bundle where two patches of cambium and one patch of xylem is in the middle. This type of vascular bundles is found in plants of family Cucurbitaceae, Solanaceae and Convolvulaceae.
So, the correct answer is 'Conjoint collateral.'

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Re-Attempt Weekly Quiz Competition

Anatomy of Flowering Plants Test - 55

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Anatomy of Flowering Plants Test - 55

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SHARING IS CARING

Question 1

Apical meristem

Intercalary meristem

Mass maristem

Both A and B

Solution

Question 2

Epidermis

Hypodermis

Outer cortex

Pericycle

Solution

Question 3

An outer layer of cortex

Epidermis

Phloem

All of the above

Solution

Question 4

Apical meristem

Intercalary meristem

Lateral meristem

Secondary meristem

Solution

Question 5

Four

One

Three

Two

Solution

Question 6

Secondary cambium

Inducible cambium

Lateral cambium

All of the above

Solution

Question 7

Intercalary meristem

Secondary meristem

Apical meristem

Both A and B

Solution

Question 8

Vacuolated cytoplasm with large nucleus

Granular non-vacuolated cytoplasm

Peripheral granular cytoplasm with small nucleus

Granular non-vacuolated cytoplasm with a conspicuous nucleus

Solution

Question 9

Phloem flanked by xylem on interior and exterior sides only

Xylem flanked by phloem on interior and exterior sides only

Xylem surrounded by phloem

Phloem surrounded completely by xylem

Solution

Question 10

Conjoint collateral

Radial

Concentric

Conjoint bicollateral.

Solution

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