Control and Coordination Test 21

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Control and Coordination Test 21

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Weekly Quiz Competition

Question 1
1 / -0

Which plant hormone induces the phenomenon of phototropism in plants?

A
Auxins

B
Ethylene

C
Cytokinin

D
Gibberellin

Solution

Auxins induce phototropism in plants, that growth of a plant part towards light (shoot) or away from light (root).
Auxins bring about elongation and growth of the shoot towards light, being sensitive to light accumulate in the region opposite to the direction in which growth has to take place, here it brings about elongation of the cells and growth of the shoot in the direction of light.
So, the correct answer is 'Auxins'
Question 2
1 / -0

Read the given statements and identify the plant hormones X, Y and Z.
(i) Hormone Y suppresses flowering in mango and also promotes rapid internode/petiole elongation in deep water rice plants and hence helping leaves or upper part of shoot to remain above water.
(ii) Hormone X promotes root growth and root hair formation.
(ii) Hormone Z inhibits the seed germination, increases the tolerance of plant to various stresses, play important role in seed development maturation and dormancy.

A
Y- Abscisic acid, X-Auxin, Z-Gibberellin

B
Y-Ethylene, X-Auxin, Z-Gibberellin

C
Y-Auxin, X-Ethylene, Z-Gibberellin

D
Y-Gibberellin , X-auxin, Z-Abscisic acid
Solution
- Gibberellic Acid (GA) suppresses flowering in fruit trees. GA plays a role in internode elongation in submerged parts of the rice plant.
- Auxin along with cytokinin promotes root growth and root hair formation.
- Abscisic acid (ABA) is a stress hormone, it protects the plant from unfavourable environmental conditions, by preventing seed germination (due to oxygen deficit, water stress etc).
So, the correct answer is option D.
Question 3
1 / -0

Which one of the following statements is correct?

A
Endocrine glands regulate neural activity, but not vice versa

B
Neurons regulate endocrine activity, but not vice versa

C
Endocrine glands regulate neural activity, and nervous system regulates endocrine glands

D
Neither hormones control neural activity nor the neurons control endocrine activity

Solution

Endocrine system, like the nervous system, is meant for internal communication and regulation of the animal body. These two systems operate in a coordinated way on many occasions. Many important functions of the endocrine system are infact, under the control of nervous system. Therefore, the two systems are often collectively called as neuroendocrine system
Question 4
1 / -0

Reflex actions are mainly controlled by:

A
Spinal cord

B
Medulla oblongata

C
Hypothalamus

D
Cerebellum

Solution

The reflex is an automatic response to a stimulus that does not receive or need conscious thought. In order to make the response quick, the spinal cord controls the reflex actions. The sensory neurons are activated by a stimulus (e.g. heat). Sensory neurons pass the nerve impulses to the relay neurons present in the spinal cord. The relay neurons pass the nerve impulses to the motor neurons. Finally, the motor neurons act on the effector organs (e.g. muscle).
So, option A is the correct option.
Question 5
1 / -0

Growth of pollen tube towards embryo sac is?

A
Chemotropic

B
Thigmotaxis

C
Geotropic

D
None of these

Solution

The pollen tube paves its way through the solid part of the stigma and style by secreting pectinases and hydrolytic enzymes. Pollen tube travels inter-cellularly and chemotropically along the concentration gradient of calcium-boron-Inositol sugar complex.
Question 6
1 / -0

The given figure shows lateral view of the human brain. Identify the parts labelled as A to E and select the correct option.

A
A - Temporal lobe, B - Corpus callosum, C - Cerebellum, D - Medulla oblongata, E - Frontal lobe

B
A - Frontal lobe, B - Thalamus, C - Cerebellum, D - Medulla oblongata, E - Occipital lobe

C
A - Temporal lobe, B - Pons, C - Cerebrum, D - Medulla oblongata, E - Frontal lobe

D
A - Frontal lobe, B - Corpus callosum, C - Cerebellum, D - Medulla Oblongata, E - Parietal lobe

Solution

A represents Frontal lobe, B represents Corpus callosum which joins the two cerebral hemispheres, C represents the cerebellum, D represents Medulla oblongata, and E- Parietal lobe.
So, the correct option is D.
Question 7
1 / -0

Observe the experimental sets $$[A]$$ and $$[B]$$.
Observe the test tube $$A$$ and $$B$$. From the list given below, choose the combination of response of shoot and root that are observed in $$B$$.

A
Positive phototropism and positive geotropism

B
Negative phototropism and positive geotropism

C
Positive phototropism and negative geotropism

D
Only negative phototropism

Solution

In the test tube A at day 1, the plant is in the inverted position.
In the figure, at day 5, the shoot is moving towards sun-light as the shoot shows positive phototropism because they require sunlight for photosynthesis.
The root is moving towards gravity as the root shows positive geotropism because they require soil for the growth and anchoring of plant.
So, the correct answer is option A- 'Positive phototropism and positive geotropism'.
Question 8
1 / -0

The appetite and satiety centres in the brain of man are located in the region of the

A
Cerebral hemisphere

B
Cerebellum

C
Medulla oblongata

D
hypothalamus

Solution

The human brain is divided into three major parts they are forebrain, midbrain, and hindbrain. The forebrain consists of the cerebrum, thalamus, and hypothalamus. Cerebrum forms a major part of the human brain. A deep cleft divides the cerebrum longitudinally into two halves, which are termed as the left and right cerebral hemispheres. The appetite and satiety centers in the brain of man are located in the region of the cerebral hemisphere.
So, the correct answer is cerebral hemisphere'.
Question 9
1 / -0

Which of the following is not a reflex action?

A
Salivation

B
Sweating

C
Withdrawal of hand when pinched by needle

D
Exercising

Solution

An automatic (involuntary) neuromuscular action excited by a defined stimulus is called reflex action. Sweating is not a reflex action. It is primarily a means of temperature regulation. But, Salivation and hand withdrawal because of the needle both are reflex actions.
Question 10
1 / -0

Nodes of Ranvier are found in

A
Axon

B
Sperm

C
Muscle fibre

D
Neuron

Solution

Correct answer: A

Explanation:

The gaps approx. 1 mm wide formed between the two adjacent myelin sheath cells, along the axons are called as the nodes of Ranvier.

Nodes of Ranvier are the uncovered part of axons.

Also they are the periodic gaps in axon that propagate the action potential down an axon.

Hence, the proper answer is 'Axon'.

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Control and Coordination Test 21

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Control and Coordination Test 21

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Question 1

Auxins

Ethylene

Cytokinin

Gibberellin

Solution

Question 2

Y- Abscisic acid, X-Auxin, Z-Gibberellin

Y-Ethylene, X-Auxin, Z-Gibberellin

Y-Auxin, X-Ethylene, Z-Gibberellin

Y-Gibberellin , X-auxin, Z-Abscisic acid

Solution

Question 3

Endocrine glands regulate neural activity, but not vice versa

Neurons regulate endocrine activity, but not vice versa

Endocrine glands regulate neural activity, and nervous system regulates endocrine glands

Neither hormones control neural activity nor the neurons control endocrine activity

Solution

Question 4

Spinal cord

Medulla oblongata

Hypothalamus

Cerebellum

Solution

Question 5

Chemotropic

Thigmotaxis

Geotropic

None of these

Solution

Question 6

A - Temporal lobe, B - Corpus callosum, C - Cerebellum, D - Medulla oblongata, E - Frontal lobe

A - Frontal lobe, B - Thalamus, C - Cerebellum, D - Medulla oblongata, E - Occipital lobe

A - Temporal lobe, B - Pons, C - Cerebrum, D - Medulla oblongata, E - Frontal lobe

A - Frontal lobe, B - Corpus callosum, C - Cerebellum, D - Medulla Oblongata, E - Parietal lobe

Solution

Question 7

Positive phototropism and positive geotropism

Negative phototropism and positive geotropism

Positive phototropism and negative geotropism

Only negative phototropism

Solution

Question 8

Cerebral hemisphere

Cerebellum

Medulla oblongata

hypothalamus

Solution

Question 9

Salivation

Sweating

Withdrawal of hand when pinched by needle

Exercising

Solution

Question 10

Axon

Sperm

Muscle fibre

Neuron

Solution

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