Plant Growth and Development Test

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Plant Growth and Development Test - 19

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Weekly Quiz Competition

Question 1
1 / -0

During germination, stem grows upward and root goes downward because .................

A
It depends upon light

B
Of auxin

C
It does not depend on light

D
Of epinasty and hyponasty

Solution

During the process of germination, shoot arises from plumule and grows negatively geotropic. This is because of the presence of auxin hormone which is present at the tips of the shoot of the plantlet. It ensures the rapid multiplication of meristematic tissues and growth of the shoot.
Question 2
1 / -0

Which of the following is not an influence of auxins?

A
Apical dominance

B
Parthenocarpy

C
Tropic movements

D
Bolting

Solution

Bolting is when agricultural and horticultural crops prematurely produce a flowering stem before the crop is harvested, in a natural attempt to produce seeds and hence reproduce. It is induced by gibberellins. It is seen in crops like lettuce, beetroot, celery, onion, etc.
Question 3
1 / -0

Auxins are abundantly produced in ...................

A
Root

B
Meristematic region of the root

C
Shoot

D
Meristematic region of the shoot

Solution

Auxins are the phytohormones present in plants which has several important roles to play in plant life. It is usually seen at the tip of shoots, at the meristematic region.
Question 4
1 / -0

Which one among the following chemical is used for causing defoliation of forest trees?

A
Amo-1618

B
Phosphon-D

C
Maleic hydrazide

D
2, 4-D

Solution

2,4-D is the synthetic auxin which is widely used as a weedicide and herbicide. It is also found to have profound uses as a defoliant for broad leaved plant, especially dicotyledonous plants.
Question 5
1 / -0

Avena coleoptile test detects the presence of

A
IAA

B
GA

C
NAA

D
BA

Solution

Avena coleoptile test or Avena curvature test was developed by Frits Went to explain the curvature of coleoptile tips of germinating oat (Avena). He discovered the substance that is present in coleoptile tips and is responsible for the curvature of germinating oat coleoptiles. He called it as auxin. Chemically auxin is Indole Acetic Acid (IAA). He developed the Avena curvature test for determining the amount of auxin which is active in very small amount in Avena coleoptile tips.
So, the correct answer is 'IAA'.
Question 6
1 / -0

Specific property attributed to gibberelins is ..................

A
Shortening of genetically tall plants.

B
Elongation of genetically dwarf plant.

C
Promotion of rooting.

D
Yellowing of young leaves.

Solution

Gibberellins are growth hormones that stimulate cell elongation and cause plants to grow taller. Gibberellins also have a role in other processes in plants, including stem elongation, germination, flowering etc
So, the correct answer is 'Elongation of genetically dwarf plant.'
Question 7
1 / -0

Seedless fruits can be obtained by treating a plant with .................

A
Enzyme

B
Auxin

C
Vitamin

D
70$$^{o}$$C and light

Solution

Auxin is the hormone in plants which induce parthenocarpy. It is the natural or artificial induced production of fruit without fertilization of ovules. Thus, forming seedless fruits.
Question 8
1 / -0

Flowering in pineapple is promoted by ..................

A
NAA

B
GA$$_{3}$$

C
Short days

D
Cytokinin

Solution

Naphthalene acetic acid - NAA. NAA is a synthetic auxin produced. It helps in the flowering of pineapple. IBA is another auxin which helps in inducing root growth in the plant cutting from the parent plant.
Question 9
1 / -0

Which of the following ion is pulled in apoplast by the auxin during growth?

A
$$Na^{+}$$

B
$$K^{+}$$

C
$$Mg^{2+}$$

D
$$H^{+}$$

Solution

The addition of auxin leads induces the formation of this PM H$$^+$$-ATPase in the dormant cambial region. This PM H$$^+$$-ATPase generates the necessary H$$^+$$-gradient (proton-motive force) for the uptake of K$$^+$$ and nutrients into cambial and expanding xylem cells.
Thus, the correct answer is (B).
Question 10
1 / -0

The presence of auxins in a solution could be tested by .................

A
Avena sativa stem tip test

B
Carbon tetrachloride test

C
lodine test

D
Defoliation test

Solution

Presence of auxin is tested by a bioassay - Avena curvature test. It is also known in the name of Avena stem tip test.

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Re-Attempt Weekly Quiz Competition

Plant Growth and Development Test - 19

Result

Plant Growth and Development Test - 19

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SHARING IS CARING

Question 1

It depends upon light

Of auxin

It does not depend on light

Of epinasty and hyponasty

Solution

Question 2

Apical dominance

Parthenocarpy

Tropic movements

Bolting

Solution

Question 3

Root

Meristematic region of the root

Shoot

Meristematic region of the shoot

Solution

Question 4

Amo-1618

Phosphon-D

Maleic hydrazide

2, 4-D

Solution

Question 5

IAA

GA

NAA

BA

Solution

Question 6

Shortening of genetically tall plants.

Elongation of genetically dwarf plant.

Promotion of rooting.

Yellowing of young leaves.

Solution

Question 7

Enzyme

Auxin

Vitamin

70$$^{o}$$C and light

Solution

Question 8

NAA

GA$$_{3}$$

Short days

Cytokinin

Solution

Question 9

$$Na^{+}$$

$$K^{+}$$

$$Mg^{2+}$$

$$H^{+}$$

Solution

Question 10

Avena sativa stem tip test

Carbon tetrachloride test

lodine test

Defoliation test

Solution

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