Anatomy of Flowering Plants Test

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Anatomy of Flowering Plants Test - 31

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Weekly Quiz Competition

Question 1
1 / -0

Vascular cambium forms

A
Secondary xylem and secondary phloem

B
Primary xylem and primary phloem

C
Only secondary phloem

D
Only primary xylem

Solution

The vascular cambium is located between the xylem and the phloem in the stem and root of a vascular plant, and is the source of both the secondary xylem growth (inwards, towards the pith) and the secondary phloem growth (outwards). It is a cylinder of unspecialized meristem cells that divide to give new cells, which then specialize to form secondary vascular tissues. Vascular cambium are found in dicots and gymnosperms but not monocots, which usually lack secondary growth
So, the correct answer is 'Secondary xylem and secondary phloem'
Question 2
1 / -0

Periderm includes

A
Phellem

B
Phelloderm

C
Phellogen

D
All of the above

Solution

The periderm is the secondary protective dermal tissue that replaces the epidermis during growth in thickness of stems and roots of gymnosperms and dicotyledons (i.e., secondary growth). Unlike typical epidermis, the periderm is a multilayered tissue system, the bulk of which usually constitutes the cork or phellem, phellogen or cork cambium and phelloderm.
Thus, the correct answer is option D.
Question 3
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Function of cork cambium is to produce

A
Secondary xylem and secondary phloem

B
Cork and secondary cortex

C
Secondary phloem and secondary cortex

D
Cork

Solution

Cork cambium is a tissue found in many vascular plants as part of the periderm. The cork cambium is a lateral meristem. It is responsible for secondary growth that replaces the epidermis in roots and stems. Cork cambium is one of the plant's meristems, the series of tissues consisting of embryonic cells from which the plant grows. It is one of the many layers of bark, between the cork and primary phloem. The function of cork cambium is to produce the cork, a tough protective material and secondary cortex.
Thus, the correct answer is option B.
Question 4
1 / -0

Root apex has a zone of slowly dividing cells in the middle of rapidly dividing cells. It is known as

A
Quiescent centre

B
Sluggish centre

C
Dormant centre

D
Non meristematic zone

Solution

The quiescent centre is a small group of cells with low mitotic activity (no cell division), which is found in the root meristem at the root apex and is surrounded by groups of dividing cells.
Hence the correct option is A.
Question 5
1 / -0

Passage cells are thin-walled cells found in

A
Central region of style through which the pollen tube grows towards the ovary

B
Endodermis of roots facilitating rapid transport of water from cortex to pericycle

C
Phloem elements that serve as entry points for substances for transport to other plants parts

D
Testa of seeds to enable emergence of growing embryonic axis during seed germination

Solution

Passage cells are endodermal cells of older roots, which have retained thin walls and Casparian strips rather than becoming suberized and waterproof like the other cells around them, to continue to allow some symplastic flow to the inside. Passage cells function to allow transfer of solutes, such as calcium and magnesium into the stele, in order to eventually reach the transpiration system.
Question 6
1 / -0

Function of cork cambium is to produce

A
Secondary xylem and secondary phloem

B
Cork and secondary cortex

C
Secondary cortex and phloem

D
Cork

Solution

Cork cambium is a tissue found in many vascular plants as part of the periderm. The cork cambium is a lateral meristem. It is responsible for secondary growth that replaces the epidermis in roots and stems. It is found in woody and many herbaceous dicots, gymnosperms and some monocots, which usually lack secondary growth.
Cork cambium is one of the plant's meristems, the series of tissues consisting of embryonic cells from which the plant grows. It is one of the many layers of bark, between the cork and primary phloem. The function of cork cambium is to produce the cork, a tough protective material and secondary cortex. Thus, option B is correct.
Secondary xylem and secondary phloem are produced by lateral meristems.
Phloem is produced by primary meristem.
Question 7
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Sea shore trees do not show distinct annual rings, because

A
There is little climatic variations

B
They belong to monocots

C
There is enough moisture

D
Soil is sandy

Solution

More distinct annual rings are formed in that regions, where climatic variations are sharp. More distinct annual rings are formed in temperate plants. Distinct annual rings are not formed in tropical plants. Least distinct annual rings are formed in seashore regions, because the climate remains same throughout the year. More clear annual rings are formed in deciduous plants as compared to evergreen plants in temperate region. In deserts annual rings are less distinct.
Question 8
1 / -0

Meristematic tissue occurs in

A
Stems

B
Roots

C
All growing tips

D
Both of the (A) and (B)
Solution
- Meristem is the region marked by the presence of active cell growth and the tissues present in meristem are termed as meristematic tissues.
- On the basis of their position in the plant body, meristems are grouped as apical, lateral or intercalary meristem.
- Stem has apical meristem in the shoot apex, intercalary meristem in nodes and lateral meristem in form of cambium in vascular bundles.
- Roots have apical meristem root apex and lateral meristem in form of cambium in vascular bundles. Shoot and root tips are the growing tips of a plant. Due to presence of root cap in terminal position, root apical meristem is subterminal in position thus, not all the growing tips have meristem.
Therefore, the correct answer is option D.
Question 9
1 / -0

Periblem form

A
Endodermis

B
Cortex

C
Both of (A) and (B)

D
Epidermis

Solution

Histogen theory was proposed by Hanstein in 1870. According to this theory, shoot apical meristem consists three distinct zones namely, dermatogen (external layer) which form outer covering of all organ of plant. Periblem (middle layer) which gives rise to cortex and endodermis. Plerome (central layer) which forms pith and primary vascular bundle.
Thus, the correct answer is option C.
Question 10
1 / -0

In monocots, root cap is formed by

A
Dermatogen

B
Calyptrogen

C
Wound cambium

D
Vascular cambium

Solution

Dermatogen is the histogen or meristematic regions of root and stem which is produced by apical meristem and give rise to uniseriate epidermis by anticlinal divisions; option A is incorrect. Monocotyledons have one additional histogen along with dermatogens, periblem and plerome Calyptrogen being the fourth one that makes root cap. The vascular cambium, also called as wood cambium, has thin walled highly vacuolated cells of two types, the fusiform initials and the ray initials. The fusiform initials are the elongated cells that give rise to secondary xylem and secondary phloem. Ray initials are horizontally organized and produce vascular rays (medullary rays or ray parenchyma).
Thus, the correct answer is option B.

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Anatomy of Flowering Plants Test - 31

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Anatomy of Flowering Plants Test - 31

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Question 1

Secondary xylem and secondary phloem

Primary xylem and primary phloem

Only secondary phloem

Only primary xylem

Solution

Question 2

Phellem

Phelloderm

Phellogen

All of the above

Solution

Question 3

Secondary xylem and secondary phloem

Cork and secondary cortex

Secondary phloem and secondary cortex

Cork

Solution

Question 4

Quiescent centre

Sluggish centre

Dormant centre

Non meristematic zone

Solution

Question 5

Central region of style through which the pollen tube grows towards the ovary

Endodermis of roots facilitating rapid transport of water from cortex to pericycle

Phloem elements that serve as entry points for substances for transport to other plants parts

Testa of seeds to enable emergence of growing embryonic axis during seed germination

Solution

Question 6

Secondary xylem and secondary phloem

Cork and secondary cortex

Secondary cortex and phloem

Cork

Solution

Question 7

There is little climatic variations

They belong to monocots

There is enough moisture

Soil is sandy

Solution

Question 8

Stems

Roots

All growing tips

Both of the (A) and (B)

Solution

Question 9

Endodermis

Cortex

Both of (A) and (B)

Epidermis

Solution

Question 10

Dermatogen

Calyptrogen

Wound cambium

Vascular cambium

Solution

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