Control And Coordination Class 10 Biology Assignment Pdf
Class 10 Biology students should refer to the following printable assignment in Pdf for Control And Coordination in standard 10. This test paper with questions and answers for Grade 10 Biology will be very useful for exams and help you to score good marks
Class 10 Biology Assignment for Control And Coordination
MCQ Questions for Class 10 Science Control and Coordination :-
(B) avena coleoptiles, fungus gibberella
(D) human urine, rice plant.
(B) enhancing root initiation
(D) preventing the growth of the lateral buds.
(B) in short day plants under long day conditions
(D) none of the above
(C) help in retention of chlorophyll
(D) promote abscission layer formation
(B) gaseous enzyme
(C) gaseous hormone
(D) liquid gas mixture
(D) short days
(B) cerebellum with optic lobes
(D) mid brain, ponsvarolli and medulla oblongata
(B) 13 pairs
(C) 6 pairs
(D) 31 pairs
(C) medulla oblongata
(B) an organ concerned with voluntary actions
(D) a vestige of third eye and endocrine gland
(C) sensory area
(D) association area
(B) sense organs
(C) internal organs
(D) skeletal muscle
(B) receptor spinal cord muscles
(D) muscles spinal cord receptor
(B) occipital lobe
(C) frontal lobe
(D) parietal lobe
Question. If we happen to touch a hot object unknowingly, we immediately pull back our hand. What is this type of action known as ?
Answer : Reflex action
Question. Which part of the brain maintains posture and balance of the body ?
Answer : The cerebellum of the brain maintains posture and balance of the body.
Question. State one function each of cerebellum and pons.
Answer : The pons participates in regulating respiration. The cerebellum helps in maintaining balance and posture of the body.
Question. Name one hormone secreted by the pituitary gland.
Answer : Antidiuretic hormone (ADH, or vasopressin)
Question. Where are hormones made in the human body ?
Answer : Endocrine glands
Question. What is the name of the system of glands which produces hormones ?
Answer : Endocrine system
Question. Name the three components of a neuron (or nerve cell).
Answer : The three components of a neuron (or a nerve cell) are the cell body, the dendrites and the axon.
Question. (a) What are the short fibres of a neuron known as ?
(b) What is the long fibre of a neuron known as ?
Answer : (a) The short fibres of a neuron are known as the dendrites.
(b) The long fibre of a neuron is known as the axon.
Question. Name the most important part of the human brain.
Answer : The cerebrum (forebrain) is the most important part of the human brain.
Question. Which gland secretes the growth hormone ?
Answer : The pituitary gland
Question. Name the hormones secreted by (a) testes, and (b) ovaries
Answer : (a) The testes secrete testosterone also known as male sex hormone.
(b) The ovaries secrete oestrogen and progesterone also known as female sex hormone.
Question. Name the two systems of control and coordination in higher animals.
Answer : The two systems of control and coordination in higher animals are the nervous system and the endocrine system.
Question. What are the two parts of the vertebrate nervous system ?
Answer : The two parts of the vertebrate nervous system are the central nervous system and the peripheral nervous system.
Question. 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
Answer : The scientific names for the following receptors in animals are-
(a) receptors for light - Photoreceptor.
(b) receptors for heat - Thermoreceptor.
(c) receptors for sound - Phonoreceptor.
(d) receptors for smell - Olfactory receptors.
(e) receptors for taste - Gustatory receptors.
Question. Name the disease caused by the deficiency
Answer : Scurvy: It is caused by a deficiency of vitamin C.
Rickets: It is caused by the deficiency of vitamin D.
Anaemia: It is caused by the deficiency of iron.
Goitre: It is caused by the deficiency of iodine
Question. Name the disease caused by the deficiency of thyroxine hormone in the body.
Answer : Goitre
Question. Which halogen element is necessary for the making of thyroxine hormone by the thyroid gland ?
Answer : Iodine
Question. Why are some patients of diabetes treated by giving injections of insulin ?
Answer : 1. Insulin is a hormone secreted by the pancreas that regulates the sugar level in the blood.
2. When this hormone is not synthesised in proper amount then the sugar level in the blood rises, then the person is said to be suffering from diabetes. This is the reason why diabetic patients are treated by giving injections of insulin.
Question. What is the name of in-built ‘arrangement’ in our body which controls the timing and amount of hormones released by various endocrine glands in the body ?
Answer : Feedback mechanism
Question. 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 exocrine gland.
Answer : (a) Thyroid is a large ductless gland present in the neck, acts only as an endocrine gland.
(b) Salivary gland present in and around the mouth and neck, acts only as an exocrine gland.
(c) Pancreas, an organ located in the abdomen, acts both as an endocrine gland and an exocrine gland.
Question. What part does the diet play in helping us to have a healthy thyroid gland ?
Answer : Diet provides iodine for making thyroxine hormone which keeps the thyroid gland healthy
Question. If sugar is detected in the urine of a person, name the disease he is suffering from.
Answer : Retina
Question. Name two parts of the body which contain receptors of chemical stimuli.
Answer : Nose and Tongue
Question. Which part of the eye contains cells which are sensitive to light ?
Answer : Retina
Question. What are the two main communications systems in an animal’s body ?
Answer : The nervous system and the endocrine system are the two main communication systems in an animal body.
Question. 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
Answer : (a) ductless gland (b) hormone
Question. Which parts of the body form the central nervous system ?
Answer : The central nervous system is made up of the brain and spinal cord.
The peripheral nervous system is made up of nerves that branch off from the spinal cord and extend to all parts of the body.
Question. Give three examples of reflex actions.
Answer : Coughing, yawning and blinking of eyes are examples of reflex actions.
Question. Why do you need iodine in your diet ?
Answer : Iodine is needed in our diet because it helps the thyroid gland in making thyroxine hormone.
Question. State whether coughing is a voluntary action or reflex action.
Answer : Reflex actions are those actions which we do without thinking to protect ourselves. Coughing is a reflex action as it clears our windpipe.
SHORT ANSWER QUESTIONS
Question : Name the hormones secreted by the following endocrine glands and specify one function of each:
(a) Thyroid (b) Pituitary (c) Pancreas
Answer : a. Thyroid: Secretes Thyroxine. It regulates metabolism of carbohydrates, fats and proteins.
b. Pituitary: Secretes growth hormone. Growth hormone regulates growth and development of body.
c. Pancreas: Secretes insulin. Insulin lowers blood sugar level.
Question : How does chemical coordination occur in plants? Explain with the help of three examples.
Answer : In plants, chemical coordination occurs through various Phytohormones.
a. Auxins secreted by growing tissues. They provide growth of plants.
b. Gibberellins cause stem elongation, seed germination and flowering.
c. Cytokinin’s present in areas of actively dividing cells like fruits, seeds. Promote cell division.
d. Abscisic acid inhibits growth and respond to environmental stress.
Question : (a) An old man is advised by his doctor to take less sugar in his diet. Name the disease from which the man is suffering. Mention the hormone due to imbalance of which he is
suffering from this disease. Which endocrine gland secretes this hormone?
(b) Name the endocrine gland which secretes growth hormone. What will be its effect on a person if there is: (i) Deficiency of growth hormones
(ii) Excess secretion of growth hormones?
Answer : a. The man is suffering with the disease Diabetes. Insulin is the hormone which is
responsible for this disease. Pancreas secretes this hormone.
b. Pituitary gland.
(i) Deficiency of growth hormone causes dwarfism.
(ii) Excess secretion of growth hormone cause gigantism in a person.
Question : Draw and label a Neuron. Explain how it carries messages.
Answer : Information from the environment is detected by dendritic tip of a neuron located in the sense organ. A chemical reaction sets off here and it creates an electrical impulse which travels from dendrite to cell body and then along the axon to its endings where it sets off the release of some chemicals. The chemicals cross the synapse and set off a similar electrical impulse in dendrites of next neuron.Another synapse at the end of its axon delivers the impulse to the other cells like muscles cells / glands (effector organs) which react to perform the action.
Question :(a) Name the part of brain which controls :
(i) voluntary action (ii) involuntary action.
(b) What is the significance of the peripheral nervous system? Name the components of this nervous system and distinguish between the origin of the two.
Answer : .a.(i) Voluntary actions - cerebellum; (ii) Involuntary action — medulla oblongata.
b. The communication between the central nervous system and the other parts of the body is facilitated by the peripheral nervous system. Cranial nerves arise from the brain; spinal nerves arise from the spinal cord.
LONG ANSWER QUESTION
Question : Draw a labelled diagram of human brain. Discuss functions of cerebrum, cerebellum and medulla.
Draw and describe the role of various parts of human brain.
Answer : Human brain has three major parts:
a. Fore-Brain contains mainly cerebrum b. Mid-brain c. Hind-brain
Functions: a. Cerebellum which controls posture, balance of body and accurate voluntary movements.
b. Pons regulates respiration
c. Medulla oblongata which controls involuntary actions like blood pressure, salivation, vomiting etc.
Question : Give the function(s) of the following plant hormones:
a. Auxins b. Gibberellins c. Cytokinins d. Abscisic acid e. Ethylene
Answer : .a. Auxins promote cell elongation, root formation, cell division, etc. It also promotes fruit growth.
b. Gibberellins stimulate stem elongation, seed germination and flowering.
c. Cytokinins help in breaking the dormancy of seeds and buds. They delay ageing in leaves.
They also promote the opening of stomata.
d. Abscisic acid promotes falling of leaves and fruits.
e. Ethylene promotes ripening of fruits
Question : (a) Draw the structure of a neuron and label the following on it:
Nucleus, Dendrite, Cell body and Axon.
(b) Name the part of neuron :
(i) Where information is acquired.
(ii) Through which information travels as an electrical impulse.
Answer : (a)
b. (i) Dendrite (ii) Axon
Question : Describe an activity to illustrate the phenomenon of phototropism and explain why does this occur.
a. Take a plant and make such an arrangement that it receives the light coming from a window as shown in the figure and observe it for few days.
b. Now,turn the flask so that the shoots are away from light and the roots towards light.
Leave it undisturbed in this condition for a few days.
c. Again, observe carefully to find the difference in the movement.
d. When growing plants detect light, auxin, synthesized at the shoot tip, helps the cells to grow longer. Auxin always diffuses towards the shady side of the shoot. This concentration of auxin stimulates the cells to grow longer on the side of the shoot which is away from light. Thus, the plant appears to bend towards light.
Question : (a) What is Phototropism and Geotropism? With labelled diagrams describe an activity to show that light and gravity change the direction that plant part grows in.
(b) Mention the role of each of the following plant hormones:
(i) Auxin (ii) Abscisic acid.
Answer : a. Phototropism It is tropic movements in the direction of light or away from it e.g. shoots bend towards light while roots grow away from it. Hence shoot is positively phototropic and root is negatively phototropic.
Geotropism: Growth of roots downward towards the earth hence positively geotropic whereas stem grows upward, away from earth, hence it is negatively geographic.
b. Auxins: Synthesized at the shoot tip, helps the cells to grow longer.
Abscisic acid: Inhibits growth, causes wilting and falling of leaves.
1. Name or give one term for the following
a) Branched protoplasmic extension of the cell body
b) Part of the brain that coordinate muscular activity
2. Give an example for plant hormone that promotes the growth.
3. Name the receptors for taste and smell.
4. Why is the use of iodised salt advisable?
5. Which part of the brain maintains posture and equilibrium of the body?
TWO MARK QUESTIONS
6. What are
a) Cranial nerves
b) Spinal nerves
7. What are synapses? What happens at the synapse between two neurons?
8. Define the terms
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