Plant Growth and Development Test

Result

Plant Growth and Development Test - 74

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

A young dicot seedling (e.g, soybeans) is laid horizontally on a surface and is subjected to gravity stimulus. The shoot bends in an upward direction and the root bends in a downward direction. Which out of the following is the possible reason for this movement?

A
Redistribution of auxins throughout the seedlings is responsible for the stimulatory unequal growth in shoots and roots.

B
Redistribution of cytokinins throughout the seedlings is responsible for the stimulatory unequal growth in roots and shoots.

C
Redistribution of auxins in roots and cytokinins in shoots is responsible for stimulatory unequal growth.

D
Redistribution of auxins in shoots and cytokinins in roots is responsible for stimulatory unequal growth.

Solution

Auxins play a paramount role in the various tropic movements shown by plants such as phototropism and gravitropism. Phototropism is the movement in response to light. The shoot tip is responsible for the directional movement in response to sunlight, as the tip is the area where auxins are synthesized. The part of the shoot tip which receives direct sunlight will have the least amount of auxin. More auxin Present On the shaded side promotes more cell division and elongation, causing the plant to bend towards sunlight. Gravitropism is the movement In response to gravity. Roots bend downWards in response to gravity due to the regulated transport of auxins called polar auxin transport.
So the correct answer is option 'A'.
Question 2
1 / -0

Ethylene is used for _________________.

A
retarding ripening of tomatoes

B
hastening of ripening of fruits

C
slowing down ripening of apples

D
both (b) and (c).

Solution

Ethylene is a fruit ripening hormone. It stimulates the biochemical changes which take place upon fruit ripening.
Question 3
1 / -0

The hormone 'X' does the following functions.
(i) Induces seed dormancy.
(ii) Inhibits seed germination.
(iii) Prepares plants to cope with stress.
(iv) Stimulates closure of stomata.
The hormone 'X' should be

A
ABA

B
Ethylene

C
GA

D
Cytokinins

Solution

ABA induces seed dormancy in unfavorable environmental condition, its function is antagonistic to gibberillin which promotes seed germination. It is regarded as the stress hormone as it brings about closure of stomata during water stress to prevent water loss from transpiration.
So, the correct answer is ' ABA'
Question 4
1 / -0

A farmer grows cucumber plants in his field. He wants to increase the number of female flowers in them. Which plant growth regulator can be applied to achieve this?

A
ABA

B
Ethylene

C
GA

D
Cytokinins

Solution

Ethylene has a feminising effect on sex expression. The genetically male plants of cucumber can be induced to produce female flowers in the presence of ethylene. The number of female flowers and hence fruit is enhanced in these plants.
So, the correct answer is option B.
Question 5
1 / -0

Gibberellins promote the formation of A flowers on genetically B plants in Cannabis whereas ethylene promotes formation of C flowers on genetically D Cannabis plants.

A
A-male, B-female, C-female, D-male

B
A-male, B-male, C-female, D-female

C
A-female, B-male, C-male, D-female

D
A-female, B-female, C-male, D-male

Solution

Gibberellins are growth hormones that stimulate cell elongation and cause plants to grow taller. Gibberellins also have a role in other plant processes, such as stem elongation, germination, flowering, and fruit ripening. Gibberellins promote the formation of male flowers on genetically female plants in Cannabis whereas ethylene promotes formation of female flowers on genetically male Cannabis plants.
So, the correct answers are "A- Male, B- Female, C- Female, D- Male."
Question 6
1 / -0

Hormone responsible for ageing is ____________.

A
GA

B
IAA

C
Ethylene

D
Cytokinin

Solution

The plant hormone ethylene is growth inhibitor and is released in plant organs that are to undergo ripening or senescence. Ethylene triggers climacteric ripening of the fruit and induces insensitivity of senescent organs to auxins due to which the nutrients are channelized to other growing parts of the plant resulting in withering away of the plant part.
So, the correct answer is 'Ethylene'
Question 7
1 / -0

Bud dormancy is induced by ________.

A
IAA

B
GA

C
ABA

D
ethylene.

Solution

ABA Is known as dormin as it induces dormancy in buds, underground stems and seeds in a variety of plants. e.g., ABA induces winter bud dormancy in duckweed plant.
Question 8
1 / -0

Read the given statements to identify the phytohormone that performs these functions.

(i) Horizontal growth of seedlings, swelling of the axis and apical hook formation in dicot seedlings.
(ii) Promoting senescence and abscission of leaves and flowers.
(iii) Breaking seed and bud dormancy.
(iv) Initiating germination in peanut seeds.
(v) Sprouting of potato tubers.

A
ABA

B
Ethylene

C
GA

D
Cytokinins

Solution

Ethylene inhibits longitudinal growth but stimulates transverse or horizontal growth and swelling of axis. It decreases the sensitivity to gravity. Roots become Apo-geotropic while stems turn positively geotropic. Leaves and flowers undergo drooping. The phenomenon is called epinasty. Seedlings develop tight epicotyl hook. It hastens the senescence of leaves and flowers.Abscission of various parts (leaves, flowers, fruits) is stimulated by ethylene which induces the formation of hydrolases. It breaks the dormancy of buds, seeds and storage organs. Rhizomes, corms, tubers, seeds (e.g., Peanut) and other storage organs can be made to sprout early by exposing them to ethylene. Initiates germination in peanut seeds.
So, the correct answer is 'Ethylene'
Question 9
1 / -0

Vernalisation can often be replaced by ______________.

A
Auxin

B
Cytokinins

C
Gibberellins

D
Ethylene

Solution

Vernalization is exposure of plants to a certain degree of cold conditions so as to make them flower, or break seed dormancy.
For example in Hyoscyamus niger a cold requiring long day plant when treated with GA, produced flowers in long day condition with out cold treatment. The exposure to GA made the plant produce hormone vernalin which induced flowering in the plant.
So, the correct answer is 'Gibberellins'
Question 10
1 / -0

Gibberellic acid induces flowering

A
in short day plants under long day conditions

B
in day-neutral plants under dark conditions

C
in some gymnospermic plants only

D
in long day plants under short day conditions.

Solution

Gibberellic acid is responsible for promoting cell elongation germination, the growth of flowers, etc. Long-day plant is a term used to refer to flowers that require long light hours and short darkness hours before blooming. Experimentally it is found out that gibberalic acid replace the long day requirement of light for flowering in plants and induce flowering.
So the correct option is 'in long day plants under short day conditions.'

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Plant Growth and Development Test - 74

Result

Plant Growth and Development Test - 74

Score

-

Rank

-

SHARING IS CARING

Question 1

Redistribution of auxins throughout the seedlings is responsible for the stimulatory unequal growth in shoots and roots.

Redistribution of cytokinins throughout the seedlings is responsible for the stimulatory unequal growth in roots and shoots.

Redistribution of auxins in roots and cytokinins in shoots is responsible for stimulatory unequal growth.

Redistribution of auxins in shoots and cytokinins in roots is responsible for stimulatory unequal growth.

Solution

Question 2

retarding ripening of tomatoes

hastening of ripening of fruits

slowing down ripening of apples

both (b) and (c).

Solution

Question 3

ABA

Ethylene

GA

Cytokinins

Solution

Question 4

ABA

Ethylene

GA

Cytokinins

Solution

Question 5

A-male, B-female, C-female, D-male

A-male, B-male, C-female, D-female

A-female, B-male, C-male, D-female

A-female, B-female, C-male, D-male

Solution

Question 6

GA

IAA

Ethylene

Cytokinin

Solution

Question 7

IAA

GA

ABA

ethylene.

Solution

Question 8

ABA

Ethylene

GA

Cytokinins

Solution

Question 9

Auxin

Cytokinins

Gibberellins

Ethylene

Solution

Question 10

in short day plants under long day conditions

in day-neutral plants under dark conditions

in some gymnospermic plants only

in long day plants under short day conditions.

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.