Plant Growth and Development Test

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Plant Growth and Development Test - 44

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Weekly Quiz Competition

Question 1
1 / -0

In plants "Auxin" is used for _______________.

A
Division of cell

B
Ripening of fruits

C
Root growth inhibition

D
Elongation and division of cell

Solution

Auxins in plants are responsible for stem elongation, it inhibits the growth of lateral buds. It also helps cells to export hydrogen ions to the cell wall region. Auxin is also responsible for controlling the growth of leaf veins.
Question 2
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Auxin is a phytohormone which is synthesized in the tips of plant shoots In an experiment a young shoot was taken and placed in a box Light was allowed to reach towards it only from a hole Which one of the following diagrams correctly depicts the movement of auxin after one hour exposure to light?
[X is the region where auxin is formed]

A

B

C

D

Solution

Auxin is a plant hormone which is present in the tip of growing stem. When a plant is exposed to phytohormone auxin, it diffuses towards the shaded side of shoot. Hence, shaded side has more amount of auxin than the area which is under the light. Due to this, the cells in shaded area grows longer than the area which is under the light. This results in curvature of plant shoot towards the light for photosynthesis.
Thus, the correct answer is option B.
Question 3
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Hormone concerned primarily with cell division is

A
GA$$_{3}$$

B
IAA

C
NAA

D
Cytokinin

Solution

Cytokinin is a type of phytohormone. It encourages the process of cell division and cell differentiation. They promote cytokinesis, and so the term 'Cytokinin'. They affect apical dominance and axillary bud growth.
So, option D " Cytokinin" is the correct answer.
Question 4
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Choose the right from the following.

i. In light, hormone auxin, helps the cells to grow longer in plants .
ii. Plant hormone gibberellins helps in growth of a stem.
iii. Cytokinins inhibits cell division.
iv. Abscisic acid promote growth in plants.

A
Option i and iii are correct.

B
Option ii and iv are correct.

C
Option i and ii are correct.

D
Option i and iv are correct.

Solution

Plants have certain chemical substances in them that transmit messages for maintaining different functions of the body.
One of the important function of auxins is that they help in the growth of the plants in the din growth like the growth of the stem.
Gibberellins help in the growth of different plant parts like stems.
Cytokinins help in cell division and differentiation, and so option iii is incorrect.
Abscisic acid retards plant growth, so option iv is also incorrect.
So, option C " Option I and ii are correct" is the correct option.
Question 5
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In Hibiscus, plants grow from

A
Seeds

B
Flowers

C
Roots

D
Branches
Question 6
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Bolting in some plants is induced by artificial treatment with which of the following plant hormones?

A
Ethylene

B
Auxin

C
Abscisic acid

D
Gibberellin

Solution

Bolting is a survival mechanism in a plant. It is the elongation of flowering stem before the crop is harvested to produce seeds. This helps in increased reproduction. Crops like lettuce, basil, onion, etc are usually bolted. It is induced by artificial treatment with plant hormone gibberellin. It causes stem elongation in plants under normal condition. Prior to flowering, internodes elongate enormously resulting in bolting.
Thus, the correct answer is option D.
Question 7
1 / -0

Plants are attracted to light through the hormonal action of

A
Gibberelic acid

B
Auxin

C
Chlorophyll

D
Thiamine
Question 8
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Treatment of seeds at low temperature under moist conditions for breaking their dormancy is ?

A
Vernalisation

B
Chelation

C
Stratification

D
Scarification

Solution

a) Vernalization is the induction of a plant's flowering process by exposure to t prolonged low temperature.
b) Chelation involves the formation of two or more separate coordinate bonds between a polydentate ligand and a single central atom.
c) Stratification involves the treatment of seed at low temperature (5 - 10$$^o$$ C) under sufficiently moist conditions to break its dormancy and to induce germination.
d) Scarification is the process of weakening seed coat mechanically, thermally or chemically to encourage germination.
So, the correct answer is C.
Question 9
1 / -0

The hormone present in higher concentration in fruits and seeds is

A
Auxin

B
Gibberellin

C
Cytokinin

D
Ethylene

Solution

Auxin promotes stem elongation. It is present in high concentration in apical meristem. Gibberellin controls shoot elongation, seed germination and delay the senescence in leaves and fruit. Cytokinin promotes cell growth and division. It is present in higher concentration in developing areas such as young fruits and seeds. Ethylene helps in fruit ripening, senescence and abscission.
Thus, the correct answer is option C.
Question 10
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Which one of the following nutrients is concerned with the growth of the plants in view of their role in synthesis of auxin ?

A
S

B
Mn

C
Zn

D
K

Solution

Zinc is an essential micronutrient required for the growth and development of plants. Zinc is involved in the synthesis of indoleacetic acid (IAA), which is a natural auxin. The function of zinc is to activate the enzyme tryptophan synthetase which is responsible for auxin biosynthesis from tryptophan.
Thus, the correct answer is option C.