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Class 10 Control and Coordination Add Questions

Control and Coordination

Animals – Nervous System

Very Short Answer Type Questions [1 Mark]

Q.1. What is the functional unit of the nervous system?

Ans. Neuron (nerve cell)

Q.2. The nervous system is composed of which type of tissues?

Ans. Nervous tissues.

Q.3. Which part of the nervous system prepares the body for increased physical activities?

Ans. Sympathetic Nervous System.

Q.4. Name the two components of the central nervous system in humans.

Ans. Brain and spinal cord.

Q.5. Define synapse.

Ans. The point of contact between the terminal branches of the axon of one neuron with dendrites of another neuron is called a synapse.

Q.6. Name the chemicals which transmit nerve impulses across the synapse.

Ans. Neurotransmitters.

Q.7. How is the spinal cord protected in the human body?

Ans. The spinal cord is enclosed in the vertebral column.

Q.8. Name the part of the brain which controls the posture and balance of the body.

Ans. The cerebellum in hindbrain.

Q.9. Which part of the brain controls the movements of our hands?

Ans. Cerebrum.

Q.10. Memory is stored in which part of the brain?

Ans. Cerebrum

Q.11. Which part of the neuron receives signals from an adjacent neuron?

Ans. Dendrites.

Q.12. What is a neuron?

Ans. The neuron is the structural and functional unit of the nervous system.

Q.13. Mention the function of the hind-brain in humans.

Ans. It coordinates the body movement, posture and respiration.

Topic 2: Coordination in Plants

Very Short Answer Type Questions [1 Mark]

Q.1. Name the different plant hormones.

Ans. Different plant hormones are auxins, gibberellins, cytokinins, ethylene and abscisic acid.

Q.2. A young green plant receives sunlight from one direction only. What will happen to its shoots?

Ans. Its shoot will bend towards the source of light.

Q.3. Name any two types of tropism.

Ans. Phototropism and geotropism.

Q.4. Give one example of chemotropism.

Ans. The growth of the pollen tube towards a chemical produced by ovule during fertilisation.

Q.5. What is the expanded form of ABA?

Ans. Abscisic Acid.

Q.6. Which plant hormone causes elongation of cells?

Ans. Auxin

Q.7. Define phototropism.

Ans. Growth movement in plants in response to the direction of light stimuli is known as phototropism.

Q.8. Name the plant hormone which is gaseous in nature.

Ans. Ethylene.

Q.9. Name one plant growth hormone which inhibits growth during the extremely dry season.

Ans. Abscisic Acid

Q.10. Name the plant hormones which are growth promoters.

Ans. Auxins, gibberellins, cytokinins, ethylene.

Q.11. Name the plant which shows nastic movement.

Ans. Mimosa pudica (touch-me-not plant).

Q.12. What is geotropism?

Ans. Downward movement of roots in response to gravitational force is called geotropism.

Q.13. What is tropism?

Ans. It is the directional movement of the part of a plant. It causes growth in response to a stimulus.

Q.14. What is geotropism?

Ans. Downward movement of roots in response to gravitational force is called geotropism.

Topic 3: Hormones in Animals

Very Short Answer Type Questions [1 Mark]

Q.1. Which endocrine gland secretes the growth hormone?

Ans. Pituitary gland.

Q.2. Name the endocrine gland which secretes neurohormones.

Ans. Hypothalamus.

Q.3. Name one sex hormone.

Ans. Testosterone in male humans.

Q.4. Which hormone prepares a lion when it is about to attack a deer?

Ans. Adrenaline.

Q.5. Which hormone plays an important role in ovulation?

Ans. Progesterone.

Q.6. Name the hormone, the secretion of which is responsible for dramatic changes in the appearance of girls when they approach 10-12 years of age.

Ans. Oestrogen is the female.

Q.7. Write the function of hormone “thyroxin” produced in our body.

Ans. It controls the overall metabolic rate of the body.

Q.8. Why is the use of iodised salt advisable?

Ans. It contains iodine which is necessary for the proper functioning of the thyroid gland to synthesise thyroxine hormone.

Q.9. Name the hormones secreted by the pancreas.

Ans. Insulin and glucagon.

Q.10. Name the disease that occurs due to a deficiency of insulin.

Ans. Diabetes mellitus.

Q.11. What causes gigantism?

Ans. Hypersecretion of growth hormone.

Q.12. Deficiency of which hormone leads to dwarfism?

Ans. Deficiency of growth hormone.

Q. 13. Name three glands which are endocrine as well as exocrine in nature.

Ans. Pancreas, testis and ovary.

Q. 14. Name the male and female hormones.

Ans. Testosterone – male sex hormone.

Estrogen and progesterone – female sex hormones.