Control and Coordination Test 23

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Control and Coordination Test 23

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Weekly Quiz Competition

Question 1
1 / -0

Thigmotropism is found?

A
In telegraph

B
In Oxalis

C
In Drosera

D
In Volvox
Question 2
1 / -0

During period of starvation, the following organ is most likely to decrease in size?

A
Brain

B
Heart

C
Thymus

D
None of these

Solution

D. None of these
EXPLANATION: As a result of starvation the liver forms large amounts of acetoacetate and d-3-hydroxybutyrate, which effect liver. During the time of starvation, the activities of amino acid dehydrogenases in muscle and of the urea cycle in liver and kidneys decline.
Question 3
1 / -0

Read the following statements :
(i) It is important to have iodised salt in our diet.
(ii) Secondary sexual characters appear in adolescents due to the release of sex hormones.
(iii) Adrenal glands produce insulin.
(iv) Hypothalamus directly releases growth hormones.
Which of the above statements are incorrect?

A
(iii), (iv)

B
(i), (ii)

C
(i), (iv)

D
(i), (ii), (iii)

Solution

Iodine is necessary for the thyroid gland to make the thyroxine hormone.
Secondary sexual characters appear in adolescents due to the release of sex hormones - testosterone (male) and oestrogen (female).
The adrenal gland produces adrenaline hormone.
The hypothalamus releases hormone that stimulates the pituitary gland to release growth hormones.
So, statements (iii) and (iv) are incorrect.
Hence, the correct answer is option A.
Question 4
1 / -0

One of the commonly used plant growth hormone is tea plantations is?

A
Ethylene

B
Abscisic acid

C
Zeatin

D
Indole-3-acetic acid

Solution

Indole-3 acetic acid is the synthetic plant hormone which are important in tea plantation. This hormone promotes rooting and is also known to have multiple effects like the development of adventitious roots in tea plants. Thus, the correct answer is option D,
Question 5
1 / -0

Which of the following plant hormones is not acidic in nature?

A
Gibberellin

B
Auxin

C
Cytokinin

D
ABA

Solution

C. Cytokinin
Cytokinin is a plant hormone which is a modified form of Adenine, a Purine. It is basic in nature. It promotes rapid cell division.
Question 6
1 / -0

Identify the incorrectly matched pair.

A
Auxin - Phototropism

B
Gibberellins - Foolish seedling disease of rice

C
Ethylene - Induces fruit ripening

D
Cytokinin's - Promote apical dominance
Question 7
1 / -0

Which of the following statement/s is/are incorrect?

A
Auxin is synthesized at shoo tip

B
Due to auxin, plant appears to bend towards dark

C
Gibberellins help in the growth of stem

D
cell division is promoted by cytokinin
Solution
Correct Answer: (B) Due to auxin, the plant appears to bend towards dark.
Explanation:
Auxin is a plant hormone that plays important role in phototropism, growth and movement in response to light.
It promotes cell elongation. It is unequally distributed in the plant cells.
It is transported towards the shady side and thus present in higher concentration.
However, less auxin is transported towards the illuminated side. Due to this, the plant grows more on the shaded side and bend in the direction of the light source.
It shows a phototropic response where faster cell elongation is seen on the shaded side than on the illuminated side.
Question 8
1 / -0

Nissl's granules are seen in?

A
Synapse

B
Cyton

C
Axon

D
Dendron

Solution

Nissl's granules are the sites of protein synthesis and are made of rough endoplasmic reticulum. They are seen in the cell body or cyton.
Hence the correct option is B.
Question 9
1 / -0

Identify the incorrect matched pair.

A
Auxin - Phototropism

B
Gibberellin - Foolish seeding disease of rice

C
Ethylene - Induces fruit ripening

D
Cytokinin's - Promotes apical dominance
Question 10
1 / -0

Two plant hormones which regulate growth of plant are?

A
Cytokinin and Auxin

B
Abscisic acid and Auxin

C
Auxin and Gibberellin

D
All of these

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Control and Coordination Test 23

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Control and Coordination Test 23

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Question 1

In telegraph

In Oxalis

In Drosera

In Volvox

Question 2

Brain

Heart

Thymus

None of these

Solution

Question 3

(iii), (iv)

(i), (ii)

(i), (iv)

(i), (ii), (iii)

Solution

Question 4

Ethylene

Abscisic acid

Zeatin

Indole-3-acetic acid

Solution

Question 5

Gibberellin

Auxin

Cytokinin

ABA

Solution

Question 6

Auxin - Phototropism

Gibberellins - Foolish seedling disease of rice

Ethylene - Induces fruit ripening

Cytokinin's - Promote apical dominance

Question 7

Auxin is synthesized at shoo tip

Due to auxin, plant appears to bend towards dark

Gibberellins help in the growth of stem

cell division is promoted by cytokinin

Solution

Question 8

Synapse

Cyton

Axon

Dendron

Solution

Question 9

Auxin - Phototropism

Gibberellin - Foolish seeding disease of rice

Ethylene - Induces fruit ripening

Cytokinin's - Promotes apical dominance

Question 10

Cytokinin and Auxin

Abscisic acid and Auxin

Auxin and Gibberellin

All of these

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