Plant Growth and Development Test

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Plant Growth and Development Test - 72

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Weekly Quiz Competition

Question 1
1 / -0

Read the given statements and select the correct option.
(i) Darwin and Darwin (1880) found that sensation of unilateral illumination was perceived by the coleoptile tip of canary grass.
(ii) IAA is universal natural auxin, discovered by Kogl et al.
(iii) IBA is both natural and synthetic auxin.
(iv) Auxins promote the growth of lateral shoots.

A
Statements (i) and (ii) are correct.

B
Statements (ii) and (iii) are correct.

C
Statements (i), (ii) and (iii) are correct.

D
Statements (i), (ii), (iii) and (iv) are correct.

Solution

Auxins promote the growth of apical buds and suppress the growth of lateral buds/lateral shoots.
So the correct option is 'Statements (i), (ii) and (iii) are correct.'
Question 2
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Artificial application of auxins like IAA, IBA, and NAA to unpollinated pistils can form

A
fruits with much flesh

B
larger fruits

C
sweet fruits

D
seedless fruits

Solution

NAA and 2, 4-D is often employed for inducing flowering in litchi and pineapple.
Application of auxins (e.g., IAA, IBA) and conjugate auxins (e.g., IBA-alanine) to unpollinated pistils make them develop into seedless fruits (or parthenocarps) which carry a better market price than the normal fruits having seeds.
So the correct answer is 'seedless fruits'.
Question 3
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Functions of auxins include

A
Promoting flowering in pineapple

B
Inducing parthenocarpy in tomato

C
Use as herbicides to kill dicot weeds

D
All of these
Solution
Auxin is a hormone produced in plants at the tip of the stems and roots.
They promote flowering in pineapple and litchi.
They make unpollinated pistils to induce parthenocarpy in tomato.
They are used as herbicides to kill broad leaved dicot weeds in cereal crops and they do not affect monocotyledons.
Thus, the correct answer is 'All of these.'
Question 4
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Which of the following statements regarding gibberellins is incorrect?

A
$$GA_3$$ was one of the first gibberellins to be discovered

B
All GA are acidic

C
They increase the length of plant axis as in grapes, sugarcanes etc

D
They promote senescence
Solution
Gibberellins are weakly acidic growth hormones having gibbane ring structure which cause cell elongation of intact plants in general and increased the internodal length of genetically dwarfed plants (e.g., pea, corn), in particular.
$$GA_3$$ was one of the first gibberellins to be discovered and remains the most intensively studied form.
The major sites of gibberellin production in plants we embryos, roots and young leaves near the shoot tip.
So the correct answer is 'They promote senescence'.
Question 5
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The term 'antiauxin' refers to _________________.

A
raw material used in the synthesis of auxin

B
compound which inhibits the action of auxin

C
artificially synthesised auxin

D
active form of auxin.

Solution

Antiauxins are chemicals that inhibit the action of auxins, however, they do not interfere with the regular metabolic processes of the cell.
Example,2,3,5 triiodobenzoicacid (TIBA),napthylthalamicacid (NPA).
So, the correct answer is 'compound which inhibits the action of auxin'
Question 6
1 / -0

Spraying sugarcane with gibberellins increases the yield by as much as 20 tonnes per acre. GA performs it by

A
improving the quality of fruit

B
increasing sugar content

C
internodal elongation

D
delaying senescence.

Solution

Gibberellin is a plant hormone that regulate growth, elongation of stem and helps in seed germination and internode elongation. Gibberellin stimulates internodule elongation in sugarcane which increases its yield.
So, the correct option is ' internodal elongation'.
Question 7
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The fruits can be left on the tree longer using GA so as to extend the market period. This is due to which function of GA?

A
Bolting

B
Delaying senescence

C
Internodal elongation

D
Inducing parthenocarpy

Solution

Some of the gibberellins are commercially used in the delayed ripening of fruits. $$GA_7$$ delays senescence so that fruit can be left on the tree for longer period. It extends period of marketing. Ripening of Citrus fruits can be delayed with the help of gibberellins. Tlh is is useful in storing the fruits.
Question 8
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Bolting, i.e., internode elongation lust prior to flowering in beet, cabbage, and many rosette plants, is promoted by

A
auxins

B
gibberellins

C
cytokinins

D
ethylene.

Solution

Certain plants show profuse leaf development but reduced internode growth. Such form of growth is called rosette, where a large number of broad leaves remain attached to a very short axis. Such plants exhibit excessive internode growth just before reproduction, the axis elongates 5-6 times the original height of the plant and starts flowering. Stimulation in the internode growth just before reproduction is called bolting. If such plants are treated with gibberellins during conditions of rosette growth, the plants bolt, and flower. Normally, bolting is favoured in nature by either cold nights or long days.
So the correct answer is 'gibberellins'.
Question 9
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Which phytohormone would you use if you are asked to 'bolt' a rosette plant?

A
Auxins

B
Gibberellins

C
Cytokinins

D
Any of these

Solution

Certain plants show profuse leaf development but reduced internode growth. Such form of growth is called rosette, where a large number of broad leaves remain attached to a very short axis. Such plants exhibit excessive internode growth just before reproduction, the axis elongates 5-6 times the original height of the plant and starts flowering. Stimulation in the internode growth just before reproduction is called bolting. If such plants are treated with gibberellins during conditions of rosette growth, the plants bolt, and flower. Normally, bolting is favored in nature by either cold nights or long days.
So the correct answer is 'Gibberellins'.
Question 10
1 / -0

Which of the following physiological effects is caused in plants by gibberellic acid?

A
Shortening of genetically tall plants

B
Elongation of genetically dwarf plants

C
Rooting in stem cuttings

D
Yellowing of young leaves

Solution

One of the most striking effects of the gibberellins is the reversal of dwarfism in many genetically dwarf plants. Rosette plant of sugar beet, when treated with $$GA_3$$, undergoes marked longitudinal growth of axis. Similarly, dwarf pea and dwarf corn attain almost normal size when treated with gibberellins. The dwarf plants have very low GA level which appears to account for the dwarfing habit. Thus, the external supply of GA to such plants causes rapid elongation.
So the correct answer is 'Elongation of genetically dwarf plants'.

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Plant Growth and Development Test - 72

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Plant Growth and Development Test - 72

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Question 1

Statements (i) and (ii) are correct.

Statements (ii) and (iii) are correct.

Statements (i), (ii) and (iii) are correct.

Statements (i), (ii), (iii) and (iv) are correct.

Solution

Question 2

fruits with much flesh

larger fruits

sweet fruits

seedless fruits

Solution

Question 3

Promoting flowering in pineapple

Inducing parthenocarpy in tomato

Use as herbicides to kill dicot weeds

All of these

Solution

Question 4

$$GA_3$$ was one of the first gibberellins to be discovered

All GA are acidic

They increase the length of plant axis as in grapes, sugarcanes etc

They promote senescence

Solution

Question 5

raw material used in the synthesis of auxin

compound which inhibits the action of auxin

artificially synthesised auxin

active form of auxin.

Solution

Question 6

improving the quality of fruit

increasing sugar content

internodal elongation

delaying senescence.

Solution

Question 7

Bolting

Delaying senescence

Internodal elongation

Inducing parthenocarpy

Solution

Question 8

auxins

gibberellins

cytokinins

ethylene.

Solution

Question 9

Auxins

Gibberellins

Cytokinins

Any of these

Solution

Question 10

Shortening of genetically tall plants

Elongation of genetically dwarf plants

Rooting in stem cuttings

Yellowing of young leaves

Solution

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