Biology

Control and Coordination

Question:

State the function of:
(i) gustatory receptors, and
(ii) olfactory receptors.

Answer:

(i) Gustatory receptors – these are sensitive to taste
(ii) Olfactory receptors – these are sensitive to smell.

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Control and Coordination

Q 1.

Why is the response of a plant to a stimulus not observed immediately?

Q 2.

(a) Name the hormones secreted by the following endocrine glands :
(i) Thyroid gland (ii) Parathyroid glands (iii) Pancreas (iv) Adrenal glands
(b) Write the functions of testosterone and oestrogen hormones.

Q 3.

What is the function of insulin hormone ? What type of patients are given insulin injections ?

Q 4.

(a) What does a plant root do in response to water ? What is this phenomenon known as ?
(b) What happens to the moonflower (i) during daytime, and (ii) at night ? What is this phenomenon known as ?

Q 5.

Name the hormones secreted by thyroid, parathyroid and pancreas.

Q 6.

Why is it advised to use iodised salt in our diet ?

Q 7.

Give an example of a plant hormone that promotes its growth. Where it is synthesized ?

Q 8.

Name the part of the brain which controls posture and balance of the body.

Q 9.

(a) Which plant hormone is present in greater concentration in the areas of rapid cell division?
(b) Give one example of a plant growth promoter and a plant growth inhibitor.

Q 10.

Name the disease caused by the deficiency of insulin hormone in the body.

Q 11.

Which halogen element is necessary for the making of thyroxine hormone by the thyroid gland ?

Q 12.

(a) Name the structural and functional unit of nervous system.
(b) Draw a flow chart to show the classification of nervous system into various parts.
(c) What is autonomic nervous system ? What is its function ?
(d) What is voluntary nervous system ? Explain the working of voluntary nervous system with an example.

Q 13.

How are involuntary actions and reflex actions different from each other?

Q 14.

What are hormones?

Q 15.

How does control and coordination occur in single-celled animals?

Q 16.

What is a plant hormone ? Name four plant hormones. State one function of each.

Q 17.

(a) What does a stem (or shoot) do in response to gravity ? What is this phenomenon known as ?
(b) What does a root do in response to light ? What is this phenomenon known as ?

Q 18.

Name the most important part of the human brain.

Q 19.

State the functions of the following hormones :
(a) Thyroxine (b) Adrenaline (c) Growth hormone

Q 20.

Define reflex action with suitable examples.

Q 21.

Name the three components of a neuron (or nerve cell).

Q 22.

a) What are the short fibres of a neuron known as ?
What is the long fibre of a neuron known as ?

Q 23.

Name, the two main organs of our central nervous system. Which one of them plays a major role in sending command to muscles to act without involving thinking process? Name the phenomenon involved.

Q 24.

What is a reflex action? Describe the steps involved in a reflex action.

Q 25.

Name the plant hormones which help/promote (i) cell division (ii) growth of
the stem and roots?

Q 26.

Which plant hormone is responsible for the wilting and falling of leaves ?

Q 27.

Give the scientific terms used to represent the following :
(a) Bending of a shoot towards light.
(b) Growing of roots towards the earth.
(c) Growth of a pollen tube towards ovule.
(d) Bending of roots towards water.
(e) Winding of tendril around a support

Q 28.

Give one example of the movement of a plant part which is caused by the loss of water (or migration of water).

Q 29.

(a) What does a Mimosa pudica plant do in response to touch ? What is this phenomenon known as ?
(b) What happens to the dandelion flower (z) during daytime, and (ii) at night ? What is this phenomenon known as ?

Q 30.

Distinguish between tropic movements and nastic movements in plants. Give examples to illustrate your answer.

Q 31.

Name one gland each :
(a) which acts only as an endocrine gland.
(b) which acts only as an exocrine gland.
(c) which acts both as an endocrine gland as well as an gxocrine gland.

Q 32.

Name two parts of the body which contain receptors of chemical stimuli.

Q 33.

Which one term in each of the following includes the other three ?
(a) thyroid, ductless gland, thymus, pituitary, ovary
(b) adrenalin, insulin, hormone, thyroxine, estrogen

Q 34.

(a) The human brain can be broadly divided into three regions. Name these three regions.
(b) What is cranium ? What is its function ?

Q 35.

(a) What is a reflex action ? Explain with the help of an example.
(b) Define reflex arc. Give the flow chart of a spinal reflex arc.
(c) How are involuntary actions and reflex actions different from each other ?

Q 36.

What is a neuron?

Q 37.

Differentiate between tropic and nastic movements.

Q 38.

Describe the central nervous system in human beings.

Q 39.

Name any growth inhibiting phytohormone.

Q 40.

What makes a stem bend towards sunlight?

Q 41.

Mention the part of the body where gustatory and olfactory receptors are located.

Q 42.

What is chemotropism? Give one example. Name any two plant hormones and mention their functions.

Q 43.

Name and explain the function of the hormone secreted by the pituitary gland in humans.

Q 44.

What is the general name of chemical substances which bring about control and coordination in plants ?

Q 45.

Name the type of chemical substances that control the growth in plants.

Q 46.

Name one hormone secreted by the pituitary gland.

Q 47.

Which gland secretes the growth hormone ?

Q 48.

What are the scientific names for the following receptors in animals ?
(a) receptors for light
(b) receptors for heat
(c) receptors for sound
(d) receptors for smell
(e) receptors for taste

Q 49.

Why are some patients of diabetes treated by giving injections of insulin ?

Q 50.

If sugar is detected in the urine of a person, name the disease he is suffering from.