Control and Coordination Test 20

Result

Control and Coordination Test 20

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

Which of the following statement about plant hormones is not true?

A
Each naturally occurring hormone has a specific chemical structure.

B
Hormones are among the principal internal regulators of plant growth.

C
Responses to plant hormones may be observed in nearly any part of a plant.

D
All known growth regulators of plant activities are chemicals produced naturally by plants.

Solution

For each known type of plant hormone, there are both naturally occurring as well as synthetic hormones.
So, the correct option is 'All known growth regulators of plant activities are chemicals produced naturally by plants '.
Question 2
1 / -0

Choose the correct answer from the alternatives given.
Plant hormones

A
interact with one another

B
are influenced by environmental cues

C
are active in plant embryos within seeds

D
all of the above

Solution

Plant hormones can work in combination and are dependent on the environmental cues or signals to act. They are also active in plant embryos within the seed such as Gibberellic acid.
So, the correct option is 'all of the above'.
Question 3
1 / -0

The term "grey matter" refers to

A
neurons that are unmyelinated

B
axons that are myelinated

C
dendrites that are myelinated

D
neurons that are myelinated

Solution

The grey matter is mainly composed of neuronal cell bodies and unmyelinated axons. In the grey matter, these axons are mainly unmyelinated, meaning they are not covered by a whitish-coloured, fatty protein called myelin. The grey matter serves to process information in the brain.

So, the correct answer is 'neurons that are unmyelinated'.
Question 4
1 / -0

Hormone involved in phototropism is ____________.

A
IAA

B
gibberellin

C
kinetin

D
2, 4-D.

Solution

Phototropic curvature is the result of uneven distribution of auxin. Darwin and Darwin observed that the coleoptiles of canary grass responded w unilateral illumination by growing towards the light source (phototropism). After a series of experiments, It was concluded that the tip of coleoptile contains auxin that caused the bending of the entire coleoptile in relation to the direction of light.
Question 5
1 / -0

Charles Darwin and his son Francis experimented with the phototropism of grass seedlings by placing a metal foil blindfold over different parts of the seedling's coleoptile. A simplified version of their results is shown in the above image. Which of the following statements best explains their results?

A
The light signal is perceived a few millimetres below the tip, and these cells cause the coleoptile to grow toward the light.

B
Both the seedling root and coleoptile perceive and respond to light in the same manner.

C
A chemical messenger must travel from the base of the coleoptile to the tip.

D
The light signal is perceived at the tip of the coleoptile, but the growth response occurs a few millimetres below the tip.
Question 6
1 / -0

Find the odd man out:

A
Auxin

B
Abscisic acid

C
Thyroxine

D
Gibberellin
Solution
- Auxin is a plant hormone that is produced in the tip of the stem that works in elongation.
- Auxin helps the plant to move to the darker side, the cell grows larger than corresponding cells present on the lighter side of the plant.
So, the correct option is 'Auxin'.
Question 7
1 / -0

Match the following.
A. IAA (i) Herring sperm DNA
B. ABA (ii) Bolting
C. Ethylene (iii) Stomatal closure
D. GA (iv) Weed-free lawns
E. Cytokinins (v) Ripening of fruits

A
A-(iv), B-(iii), C-(v), D-(ii), E-(i)

B
A-(v), B-(iii), C-(iv), D-(ii), E-(i)

C
A-(iv), B-(i), C-(iv), D-(iii), E-(ii)

D
A-(v), B-(iii), C-(ii), D-(i), E-(iv)

Solution

IAA is an auxin but has potential role of herbicide and weedicide. ABA is stress inducing plant growth regular. It can induce closure of stomata, Ethylene on other hand increases climactic rate and hence used for fruit ripening, GA or gibberlic acid are known to cause bolting in crucifers. Cytokinins were first isolated from Herring sperm DNA.
Thus, the correct answer is 'A-(iv), B-(iii), C-(v), D-(ii), E-(i).'
Question 8
1 / -0

The term synergistic action of hormones refers to

A
When two hormones act together but bring about opposite effects.

B
When two hormones act together and contribute to the same function.

C
When one hormone affects more than one

D
When many hormones bring about any one function.

Solution

Growth, differentiation and development processes of plants are found to be regulated by two or more phytohormones acting synergistically or antagonistically, e.g. cell division is promoted by both auxins and cytokinins acting synergistically. Cell growth is controlled by auxins, gibberellins, and cytokinins. Morphogenesis is an interplay of auxins and cytokinins, where both must be present in some minimum concentration.
So the correct answer is 'When two hormones act together and contribute to the same function.'.
Question 9
1 / -0

Match column I with column II and select the correct option from the codes given below.
Column I
(Phytohormone) Column II
(Plant part where it is synthesised)
A.
IAA (i) Tissues undergoing senescence
B. Cytokinins (ii) Shoot apices
C. Ethylene (iii) Root apices

A
A-(ii), B-(iii), C-(i)

B
A-(iii), B-(ii), C-(i)

C
A-(i), B-(ii), C-(iii)

D
A-(ii), B-(i), C-(iii)

Solution

IAA or auxin promotes the growth of shoot at the apical buds. Cytokinins promote root growth in plants. Ethylene is produced by the aging parts of plants undergoing senescence.
So, the correct answer is option A.
Question 10
1 / -0

Read the given statements and select the option that is/are incorrect ones.

(i) Cytokinin is primarily concerned with cell division.
(ii) $$C_2H_4$$ breaks seed and bud dormancy.
(iii) ABA stimulates the opening of stomata.
(iv) $$C_2H_4$$ initiates germination in peanut seeds, sprouting of potato tubers.
(v) ABA is synergistic to GA.

A
(i), (ii) and (iv)

B
(iii) and (ii)

C
(iii) and (v)

D
(iv) and (v)

Solution

ABA is regarded as the stress hormone or a growth inhibitor. In conditions of water stress ABA initiates closure of stomata to prevent water loss through transpiration. It is antagonistic to GA as the latter promotes seed germination, while ABA prevents seed germination.
So, the correct answer is ' (iii) and (v)'

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

A.	IAA	(i)	Herring sperm DNA
B.	ABA	(ii)	Bolting
C.	Ethylene	(iii)	Stomatal closure
D.	GA	(iv)	Weed-free lawns
E.	Cytokinins	(v)	Ripening of fruits

	Column I (Phytohormone)		Column II (Plant part where it is synthesised)
A.	IAA	(i)	Tissues undergoing senescence
B.	Cytokinins	(ii)	Shoot apices
C.	Ethylene	(iii)	Root apices

Control and Coordination Test 20

Result

Control and Coordination Test 20

Score

-

Rank

-

SHARING IS CARING

Question 1

Each naturally occurring hormone has a specific chemical structure.

Hormones are among the principal internal regulators of plant growth.

Responses to plant hormones may be observed in nearly any part of a plant.

All known growth regulators of plant activities are chemicals produced naturally by plants.

Solution

Question 2

interact with one another

are influenced by environmental cues

are active in plant embryos within seeds

all of the above

Solution

Question 3

neurons that are unmyelinated

axons that are myelinated

dendrites that are myelinated

neurons that are myelinated

Solution

Question 4

IAA

gibberellin

kinetin

2, 4-D.

Solution

Question 5

The light signal is perceived a few millimetres below the tip, and these cells cause the coleoptile to grow toward the light.

Both the seedling root and coleoptile perceive and respond to light in the same manner.

A chemical messenger must travel from the base of the coleoptile to the tip.

The light signal is perceived at the tip of the coleoptile, but the growth response occurs a few millimetres below the tip.

Question 6

Auxin

Abscisic acid

Thyroxine

Gibberellin

Solution

Question 7

A-(iv), B-(iii), C-(v), D-(ii), E-(i)

A-(v), B-(iii), C-(iv), D-(ii), E-(i)

A-(iv), B-(i), C-(iv), D-(iii), E-(ii)

A-(v), B-(iii), C-(ii), D-(i), E-(iv)

Solution

Question 8

When two hormones act together but bring about opposite effects.

When two hormones act together and contribute to the same function.

When one hormone affects more than one

When many hormones bring about any one function.

Solution

Question 9

A-(ii), B-(iii), C-(i)

A-(iii), B-(ii), C-(i)

A-(i), B-(ii), C-(iii)

A-(ii), B-(i), C-(iii)

Solution

Question 10

(i), (ii) and (iv)

(iii) and (ii)

(iii) and (v)

(iv) and (v)

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.