Plant Growth and Development Test

Result

Plant Growth and Development Test - 22

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Weekly Quiz Competition

Question 1
1 / -0

The hormone involved in metabolism of food material in cereal grain during germination is .....................

A
Auxin

B
CKN

C
GA

D
None of the above

Solution

GA promotes synthesis of several substances which induces seed germination. It results in the synthesis of RNA, proteins, enzymes like alpha amylase, proteases, etc from the aleurone layer of endosperm.
Question 2
1 / -0

Gibberellin is helpful in .....................

A
Elongation of plants

B
Inducing dwarfism

C
Fat hydrolysis

D
Protein synthesis

Solution

GA induces the division of lateral meristem and thus results in the elongation of plant. It has several other important functions like cell elongation, bolting, overcoming seed dormancy, etc.
Question 3
1 / -0

The activity of $$\alpha $$-amylase in the endosperm of barley germinating seed is induced by .......

A
Ethylene

B
Cytokinin

C
IAA

D
Gibberellin

Solution

Nutritive tissue present in the seed named as endosperm, contains aleurone layer. It contains several enzymes like alpha amylase, proteases, etc., which are essential for breaking seed dormancy. The synthesis of these are induced by GA.
Question 4
1 / -0

Gibberellins were first discovered in fungal genus

A
Mucor

B
Rhizopus

C
Agaricus

D
Fusarium

Solution

GA was first discovered from a fungus, which belongs to ascomycota - Gibberella fujikori. It is a Fusarium moniliforme. It is a fungal plant pathogen which causes bakane disease in rice seedlings. It is done by overloading them with gibberellin as its own metabolic byproduct.
Question 5
1 / -0

Which of the following is capable of delaying yellowing of leaves?

A
Gibberellins

B
Cytokinins

C
ABA

D
Auxins

Solution

Cytokinin is a plant hormone which prevents the degeneration of chlorophyll and protein and thus causes the delay in ageing of the plant. It thus helps in reducing the leaf fall. This is called as 'Richmond Lang effect' by cytokinin.
Question 6
1 / -0

Which of the following is a coconut milk factor?

A
Auxin

B
Cytokinin

C
Morphactin

D
None of the above

Solution

Kinetin is present in the coconut water, which is actually a liquid endosperm. Hence, the name coconut milk factor. It actually serves as the nourishment for the growth of embryo in coconut. Coconut water is also used as artificial blood plasma.
Question 7
1 / -0

Guttman (1957) found a quick increase in the amount of RNA in the nuclei on onion root after .............

A
Auxin treatment

B
Kinetin treatment

C
Gibberellin treatment

D
All of the above

Solution

Kinetin promotes the synthesis of RNA, proteins, etc., which help in initiation of root, breaking of seed dormancy, etc. In the case of onion root, which underwent kinetin treatment more RNA could be spotted because of this reason.
So the correct answer is 'Kinetin treatment'
Question 8
1 / -0

Cambial tissue of Pinus radiata contains ..............

A
Auxins

B
Gibberellins

C
Cytokinin

D
None of the above

Solution

Cytokinins have been extracted from cambial tissues in the stems of Eucalyptus regnans, Nicotiana tabacum and Pinus radiata. Cessation and reactivation of cell division activity in the vascular cambium is controlled by cytokinin availability.
Question 9
1 / -0

Farmers in a particular region were concerned that premature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?

A
Removal of all yellow leaves and spraying the remaining green leaves with 2,4,5 - trichlorophenoxy acetic acid.

B
Application of iron and magnesium to promote synthesis of chlorophyll.

C
Frequent irrigaion of the crop.

D
Treatment of the plants with cytokinins along with a small dose of nitrogenous fertilizer.
Solution
Solution

Correct answer is option B.

Explanation for correct option:
- If a pulse crop shows premature yellowing of leaves and a decrease in yield then the application of magnesium and iron to promote synthesis of chlorophyll may become most beneficial to overcome the problem and to obtain maximum seed yield.
- Magnesium is an important part of ring structure of chlorophyll molecule and its deficiency causes chlorosis and premature leaf abscission.
- In iron deficiency also, the leaves become chlorotic because iron is required for the synthesis of some of the chlorophyll protein complexes in the chloroplast.
Question 10
1 / -0

An excised leaf does not turn yellow if it is induced to root. This is attributed to synthesis in root of ...................
or
Leaf ageing is retarded by ........................

A
Ethylene

B
Cytokinins

C
Gibberellins

D
Auxins

Solution

According to Richmond lang effect, cytokinin hormone in plants will cause retardation of chlorophyll and several other proteins. Thus, it helps in reducing the senescence.

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Plant Growth and Development Test - 22

Result

Plant Growth and Development Test - 22

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Question 1

Auxin

CKN

GA

None of the above

Solution

Question 2

Elongation of plants

Inducing dwarfism

Fat hydrolysis

Protein synthesis

Solution

Question 3

Ethylene

Cytokinin

IAA

Gibberellin

Solution

Question 4

Mucor

Rhizopus

Agaricus

Fusarium

Solution

Question 5

Gibberellins

Cytokinins

ABA

Auxins

Solution

Question 6

Auxin

Cytokinin

Morphactin

None of the above

Solution

Question 7

Auxin treatment

Kinetin treatment

Gibberellin treatment

All of the above

Solution

Question 8

Auxins

Gibberellins

Cytokinin

None of the above

Solution

Question 9

Removal of all yellow leaves and spraying the remaining green leaves with 2,4,5 - trichlorophenoxy acetic acid.

Application of iron and magnesium to promote synthesis of chlorophyll.

Frequent irrigaion of the crop.

Treatment of the plants with cytokinins along with a small dose of nitrogenous fertilizer.

Solution

Question 10

Ethylene

Cytokinins

Gibberellins

Auxins

Solution

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