Plant Growth and Development Test

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Plant Growth and Development Test - 76

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Weekly Quiz Competition

Question 1
1 / -0

Where are the auxins synthesized?

A
In the region of root apex and shoot apex

B
In the region of root apex and leaf apex

C
In the region of leaf apex and shoot apex

D
Only in the leaf

Solution

Auxins are phytohormones synthesized and released at the root and shoot apex
So, the correct answer is 'In the region of root apex and shoot apex'
Question 2
1 / -0

Mobilization of stored food in germinating seed is triggered by

A
GA

B
IAA

C
Morphactin

D
None of the above

Solution

Gibberellins or gibberellic acids (GA) promote the process of germination because they hydrolyze and mobilize the food stored in the endosperm by releasing the enzymes from the aleurone layer.
Hence, the correct answer is 'GA'
Question 3
1 / -0

Apoptosis can be induced in a plant organ or the whole plant using ____

A
Gibberellins

B
Ethylene

C
Cytokinnins

D
Ausin

Solution

In most plants ethylene acts as the hormone responsible for Apoptosis.
So, the correct answer is 'Ethylene'
Question 4
1 / -0

The pineapple which under natural conditions is difficult to blossom has been made to produce fruits throughout the year by application o

A
IAA, IBA

B
Phenyl acetic acid

C
NAA, 2, 4-D

D
Cytokinin

Solution

Plants such as pineapple which under natural conditions is difficult to blossom(flower)can be made to do so by spraying them with synthetic auxins such as 2,4-D(2,4-dichloro phenoxy acetic acid) and NAA (Naphtehle acetic acid).
So, the correct answer is 'NAA, 2, 4-D'.
Question 5
1 / -0

Which of the plant growth regulator induces parthenocarpy in tomatoes?

A
Auxin

B
Gibberellin

C
Cytokinin

D
Ethylene

Solution

Auxin is a plant growth hormone needed for plant growth and development. When auxin is bound to a receptor (eg: auxin-binding proteins), it activates stimuli pathways and then activates gene expression. Mostly 2,4-D is responsible for inducing parthenocarpy in tomatoes.
So, the correct answer is 'Auxin'.
Question 6
1 / -0

Which plant hormone is found in gaseous form?

A
Auxin

B
Cytokinin

C
Ethylene

D
ABA

Solution

Plant hormones are also called as phytohormones. These are essential to plants as they perform many important functions such as growth, flowering, phototropism, stem elongation, cell division, the ripening of fruit, etc. There are 5 major plant hormones, namely auxin, cytokinin, ethylene, abscisic acid, and gibberellin. Out of these hormones, ethylene is found in the gaseous form. It helps in the ripening of fruits.
Thus, the correct answer is 'Ethylene.'
Question 7
1 / -0

Gibberellins are ______ in nature:

A
acidic

B
basic

C
neutral

D
none of these
Question 8
1 / -0

A high concentration of auxins can inhibit plant growth. Many of these compounds could be used as

A
Fruit ripener

B
Stimulants

C
Herbicides

D
Energy savers
Question 9
1 / -0

Choose the wrong one :

A
Plants absorb iron as $$Fe^{2+}$$

B
Iron is reversibly oxidized from $$Fe^{2+}$$ to $$Fe^{2+}$$

C
Both Mg and Mn activate the enzymes involved in photosynthesis and respiration

D
Zn is involved in the synthesis of auxin.

Solution

Zinc is not principle required for the synthesis of auxin, but for its maintenance in an active state, zinc is involved. Lack of zinc leads to the destruction of auxin.
So, the correct option is Zn is involved in the synthesis of auxin
Question 10
1 / -0

Which GA was first gibberellin to be discovered?

A
$$GA_1$$

B
$$GA_2$$

C
$$GA_3$$

D
$$GA_4$$
Solution
- Gibberellins or gibberellic acids are plant hormones which help in stem elongation, breaking dormancy, germination, flowering, development of flower and senescence leaf and fruit.
- These are the longest-known classes of plant hormone.
- About 126 GAs have been identified from plants, fungi, and bacteria.
- The gibberellins are named based on GAn in order of discovery.
- The first gibberellic acid to be structurally characterized was GA$$_3$$ and the first one to be discovered was GA$$_1$$.
- So, the correct answer is 'GA1'.

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Plant Growth and Development Test - 76

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Plant Growth and Development Test - 76

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SHARING IS CARING

Question 1

In the region of root apex and shoot apex

In the region of root apex and leaf apex

In the region of leaf apex and shoot apex

Only in the leaf

Solution

Question 2

GA

IAA

Morphactin

None of the above

Solution

Question 3

Gibberellins

Ethylene

Cytokinnins

Ausin

Solution

Question 4

IAA, IBA

Phenyl acetic acid

NAA, 2, 4-D

Cytokinin

Solution

Question 5

Auxin

Gibberellin

Cytokinin

Ethylene

Solution

Question 6

Auxin

Cytokinin

Ethylene

ABA

Solution

Question 7

acidic

basic

neutral

none of these

Question 8

Fruit ripener

Stimulants

Herbicides

Energy savers

Question 9

Plants absorb iron as $$Fe^{2+}$$

Iron is reversibly oxidized from $$Fe^{2+}$$ to $$Fe^{2+}$$

Both Mg and Mn activate the enzymes involved in photosynthesis and respiration

Zn is involved in the synthesis of auxin.

Solution

Question 10

$$GA_1$$

$$GA_2$$

$$GA_3$$

$$GA_4$$

Solution

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