Control And Coordination Test

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Control And Coordination Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Refer to the experimental set up given below.

With respect to the concept shown in the experiment, choose the incorrect statement from the options given below:

A
It shows the directional movement of the pea seedling in response to water.

B
A phototropic curvature of the root is observed towards water.

C
Roots show hydrotropism and are positively hydrotropic.

D
As water is not available in the sand, the root bends towards the pot filled with water.

Solution

The figure shows the directional movement of the pea seedling in response to water. It is not a phototropic response. Hence, the statement given in option 2 is incorrect.
Question 2
1 / -0

Refer to the diagram given below:

Select the correct statement regarding the hormone that causes this effect.

A
Inhibits the growth of lateral buds and promotes apical dominance

B
Closes stomata during water stress

C
Promotes fruit ripening

D
Stimulates cell division and elongation

Solution

Auxins are responsible for the phototropic effect shown in the figure. Auxins inhibit the growth of lateral buds and promotes apical dominance.
Question 3
1 / -0

Read the statements given below and select the correct option.

Statement 1: Insulin and glucagon are antagonistic hormones.
Statement 2: Insulin lowers blood glucose and glucagon increases blood glucose.

A
Both statements 1 and 2 are true, and statement 2 is the correct explanation of statement 1.

B
Both statements 1 and 2 are true, and statement 2 is not the correct explanation of statement 1.

C
Statement 1 is true, but statement 2 is false.

D
Both statements 1 and 2 are false.

Solution

Insulin and glucagon are antagonistic hormones. They have opposing effects. Insulin lowers blood glucose and glucagon increases blood glucose levels.
Question 4
1 / -0

Hearing the noise of gun bullet shots, scared Raman and his friends who were attending a concert started to run haphazardly. Which hormone initiated this action?

A
Oxytocin

B
Thyroxine

C
Adrenaline

D
Oestrogen

Solution

Adrenaline is the hormone that helps to cope up with any emergency situation or stress. In the situation given, adrenaline will be released to cope up with the emergency.
Question 5
1 / -0

Dramatic changes of body features associated with puberty are mainly because of the secretion of

A
oestrogen from testes and testosterone from ovary

B
oestrogen from adrenal gland and testosterone from pituitary gland

C
testosterone from testes and oestrogen from ovary

D
testosterone from thyroid gland and oestrogen from pituitary gland

Solution

Testosterone is released from testes and oestrogen from ovary. These two hormones are responsible for changes during puberty.
Question 6
1 / -0

Refer to the figure given below. It depicts the locations of various endocrine glands in the human body.

Select the incorrect statement from the ones given below:

A
A is the master gland and produces growth hormone.

B
The hormone produced by gland B requires iodine, the deficiency of which causes goitre.

C
Gland C produces insulin, whose increased secretion leads to diabetes.

D
Gland D produces adrenaline, which helps in fight or flight response.

Solution

Gland C depicts pancreas that produces insulin. Decreased secretion of insulin causes diabetes.
Question 7
1 / -0

Phototropic and geotropic response of a plant is under the control of which of the following hormones?

A
Auxin

B
Gibberellin

C
Cytokinin

D
Ethylene

Solution

Auxins cause cells to become longer. On exposure to sunlight, by releasing auxins on one side of a stem but not on the other side, a stem will bend because one side becomes longer than the other. In geotropic movement also, the changed relations in the concentration of auxin leads to differential growth of the root tissues. Taken together, the root turns to follow the gravity stimuli. The redistribution of auxin causes the shoot to turn in a direction opposite to that of the gravity stimuli.
Question 8
1 / -0

Study the relationship of the given pairs and choose the correct option to fill in the blank.

Oestrogen : Oogenesis
Prolactin : Lactation
Oxytocin : _______

A
Thickness of endometrium

B
Secondary sexual character

C
Rhythmic contraction of uterus during delivery of the baby

D
Provides protection against intestinal and respiratory functions

Solution

The two main actions of oxytocin in the body are contraction of the womb (uterus) during childbirth and lactation. Oxytocin stimulates the uterine muscles to contract and also increases production of prostaglandins, which increase the contractions further.
Question 9
1 / -0

Geeta is unable to walk in a straight line. Which part of the brain is affected?

A
Cerebrum

B
Cerebellum

C
Medulla oblongata

D
Hypothalamus

Solution

The cerebellum coordinates voluntary movements such as posture, balance, coordination, and speech, resulting in smooth and balanced muscular activity.
Question 10
1 / -0

Which of the following is an example of conditioned reflex?

A
Withdrawal of hand on touching a hot surface

B
Salivation on seeing/smelling food

C
Sneezing during cold weather

D
Running indoors on arrival of rain

Solution

Conditioned reflex is the one acquired as the result of experience. When the action is repeated, the nervous system becomes familiar and learns to act automatically.
Question 11
1 / -0

Autonomic nervous system includes

A
cranial nerves and sympathetic nervous system

B
sympathetic nervous system and spinal nerves

C
sympathetic nervous system and parasympathetic nervous system

D
None of the above

Solution

Autonomic nervous system (ANS) is an involuntary part of the nervous system that controls the involuntary activities of various body viscera. It consists of sympathetic nervous and parasympathetic nervous system. Sympathetic nervous system is responsible for a quick action. Parasympathetic nervous system is responsible for the decrease in one's heartbeat, etc.
Question 12
1 / -0

Many biological systems and processes are common in both plants and animals. Which of the following processes is found in animals only?

A
Nervous control

B
Hormonal control

C
Respiration

D
Diffusion

Solution

Processes of respiration and diffusion are found in plants. Plant hormones play an important role in control and coordination of plant activities. Plants do not have a nervous or muscular system to control and coordinate the body movements. They use chemical signals to convey information from one cell to another.
Question 13
1 / -0

Dwarfness in plants can be controlled by the treatment of which of the following hormones?

A
Cytokinin

B
Gibberellic acid

C
Auxin

D
Ethylene

Solution

Gibberellins or gibberellic acid causes stem elongation. Treatment of plants with gibberellic acid causes the plants to grow taller and helps to control dwarfness.
Question 14
1 / -0

Flowers of primrose open in the morning and close at night. This is an example of

A
photonasty

B
nyctinasty

C
thermonasty

D
seismonasty

Solution

Nastic movements are non-directional. Photonastic movements are due to the change in the intensity of light. These are also known as sleep movements. For example, flowers of primrose open in the morning and close at night.
Question 15
1 / -0

Which of the following is defined as the movement stimulated by external factors?

A
Spontaneous movement

B
Autonomic movement

C
Physical movement

D
Paratonic movement

Solution

Paratonic movement is defined as the movement of whole or a part of a plant due to influence of an external stimuli. These are further of three types: tropic, tactic and nastic movements.
Question 16
1 / -0

Which of the following hormones is responsible for the closing of stomatal pores under stress?

A
IAA

B
ABA

C
IBA

D
2,4-D

Solution

Abscisic acid (ABA) is a plant hormone. ABA functions in many plant developmental processes, including seed and bud dormancy, and stomatal closure.
Question 17
1 / -0

Which of the following hormones stimulate(s) the synthesis of amylase in germinating cereals?

A
Cytokinin

B
Abscisic acid

C
Gibberellins

D
Auxin

Solution

Gibberellins help break the dormancy of seeds. The developing embryo releases gibberellins that act on a layer of cells on the outside of the endosperm, stimulating these cells to release the starch-digesting enzyme amylase.
Question 18
1 / -0

In which of the following parts of plant is the highest concentration of auxins present?

A
Root apex

B
Shoot apex

C
Petiole

D
Node

Solution

Auxin is a plant hormone produced in the stem tip or shoot apex that promotes cell elongation.
Question 19
1 / -0

Which of the following statements is incorrect?

A
Hormones are used to control and coordinate the body.

B
Hormones are synthesised at places away from where they act.

C
Hormonal control is a faster means of communication than nervous control.

D
Hormones are able to recognise information and even transmit it.

Solution

Hormonal control is a slower means of communication than nervous control. But it can potentially reach all cells of the body, regardless of nervous connections, and it can be done steadily and persistently.
Question 20
1 / -0

Which of the following glands does not occur in pairs?

A
Ovary

B
Testis

C
Adrenal gland

D
Pancreas

Solution

Pancreas is located in the upper left area of abdomen, behind stomach and near duodenum, the first section of small intestine. It does not occur in pairs as the the glands given in other three options.

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Control And Coordination Test - 3

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Control And Coordination Test - 3

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SHARING IS CARING

Question 1

It shows the directional movement of the pea seedling in response to water.

A phototropic curvature of the root is observed towards water.

Roots show hydrotropism and are positively hydrotropic.

As water is not available in the sand, the root bends towards the pot filled with water.

Solution

Question 2

Inhibits the growth of lateral buds and promotes apical dominance

Closes stomata during water stress

Promotes fruit ripening

Stimulates cell division and elongation

Solution

Question 3

Both statements 1 and 2 are true, and statement 2 is the correct explanation of statement 1.

Both statements 1 and 2 are true, and statement 2 is not the correct explanation of statement 1.

Statement 1 is true, but statement 2 is false.

Both statements 1 and 2 are false.

Solution

Question 4

Oxytocin

Thyroxine

Adrenaline

Oestrogen

Solution

Question 5

oestrogen from testes and testosterone from ovary

oestrogen from adrenal gland and testosterone from pituitary gland

testosterone from testes and oestrogen from ovary

testosterone from thyroid gland and oestrogen from pituitary gland

Solution

Question 6

A is the master gland and produces growth hormone.

The hormone produced by gland B requires iodine, the deficiency of which causes goitre.

Gland C produces insulin, whose increased secretion leads to diabetes.

Gland D produces adrenaline, which helps in fight or flight response.

Solution

Question 7

Auxin

Gibberellin

Cytokinin

Ethylene

Solution

Question 8

Thickness of endometrium

Secondary sexual character

Rhythmic contraction of uterus during delivery of the baby

Provides protection against intestinal and respiratory functions

Solution

Question 9

Cerebrum

Cerebellum

Medulla oblongata

Hypothalamus

Solution

Question 10

Withdrawal of hand on touching a hot surface

Salivation on seeing/smelling food

Sneezing during cold weather

Running indoors on arrival of rain

Solution

Question 11

cranial nerves and sympathetic nervous system

sympathetic nervous system and spinal nerves

sympathetic nervous system and parasympathetic nervous system

None of the above

Solution

Question 12

Nervous control

Hormonal control

Respiration

Diffusion

Solution