CBSE Class 10 Science Chapter 7 Control and Coordination Very Short Answer Questions

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CBSE Class 10 Science Chapter 7 Control and Coordination Very Short Answer Questions

Question 1. At the time of puberty, both boys and girls show lots of changes in appearance. Name the hormones responsible for these changes.
Answer: Testosterone in males and estrogen in females.

Question 2. Give one example of chemotropism.
Answer: The growth of a pollen tube towards a chemical produced by an ovule during fertilization of a flower is an example of chemotropism.

Question 3. Where are Nissl’s granules found and what is their nature?
Answer: Nissl’s granules are found in cyton and dendrites. These are formed of ribonucleic acid (RNA).

Question 4. A young green plant receives sunlight from one direction only. What will happen to its shoots and roots?
Answer: Shoot will bend towards the light and root away from the light.

Question 5. Name the part of the brain which is concerned with muscular coordination in the body.
Answer: Cerebellum.

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CBSE Class 10 Science Chapter 7 Control and Coordination

Question 6. A potted plant is made to lie horizontally on the ground. Which part of the plant will show?

  1. Positive geotropism.
  2. Negative geotropism.

Answer:

  1. Root
  2. Shoot

Question 7. All information about our environment is detected by the specialized tips of some nerve cells. Write the name given to such tips and also mention where they are located.
Answer: Receptors. They are located in the sense organizer:

Question 8. Why do endocrine glands release their secretions into the blood?
Answer: It is because endocrine glands are ductless.

Question 9. Name the main hormone secreted by the thyroid gland and state its one function.
Answer:

The main hormone secreted by the thyroid gland is thyroxine. It regulates the metabolism of carbohydrates, fats, and proteins in the body to provide the best growth balance.

Question 10. Name the part of the hindbrain which takes part in the regulation of respiration.
Answer: The Pons part of the hindbrain takes part in regulating respiration.

Question 11. Name the place of the human body where the largest number of neurons are found.
Answer: Human brain.

Question 12. What is the stimulus in:

  1. Phototropism
  2. Geotropism
  3. Chemotropism

Answer:

  1. Phototropism – Light
  2. Geotropism – Gravity
  3. Chemotropism – Chemicals

Question 13. State the function of:

  1. Gustatory receptors
  2. Olfactory receptors

Answer:

  1. Gustatory receptors receive a taste.
  2. Olfactory receptors receive smell.

Question 14. Define ‘reflex action’.
Answer: Reflex action is a sudden, involuntary spontaneous response to the stimulus that is usually helpful to protect ourselves from any kind of harm.

Question 15. What type of movement is responsible for the growth of pollen tubes towards ovules?
Answer: Nastic movement.

Question 16. What is a synapse?
Answer: Synapse is the functional junction between two neurons.

Question 17. Name one organ where growth hormone is synthesized in the case of plants and man.
Answer:

  1. Shoot tip in plants.
  2. The pituitary gland in man.

Question 18. What is the function of the ‘Hypothalamus’?
Answer: It regulates the secretion of hormones from the pituitary gland.

Question 19. Name two tissues that provide control and coordination in multicellular animals.
Answer:

  1. Nervous tissue.
  2. Endocrine tissue.

Question 20. Define ‘chemotropism’.
Answer: It is a nastic response towards the chemicals like the germination of pollen tubes when the pollen grains land on the stigma.

Question 21. Which system facilitates the communication between the central nervous system and other parts of the body?
Answer: Endocrine system.

Question 22. Why is it advised to use iodized salt in our diet?
Answer: Iodised salt contains iodine which is necessary for the thyroid gland to synthesise thyroxine hormone. Thyroxine regulates carbohydrate, protein, and fat metabolism in the body to provide growth balance.

Question 23. Why is the pituitary called the master gland?
Answer: The pituitary gland controls the activity of other endocrine glands, so it is called the master gland.

Question 24. Name the sensory receptors found in the nose and on the tongue.
Answer: Olfactory receptors, gustatory receptors.

Question 25. Where is glucagon secreted? What is its function?
Answer: Glucagon is secreted in the L-cells of islets of Langerhans Function of glucagon is to increase the blood glucose level.

Question 26. Why are endocrine glands called ductless glands?
Answer: Because they do not have any external duct to discharge their secretion into the bloodstream.

Question 27. Why hormones are called ‘Chemical messengers’?
Answer: Hormones are carried in the bloodstream to all parts of the body, so they are called ‘Chemical messengers’.

Question 28. Name the plant hormone responsible for the promotion of cell division.
Answer: Cytokinin.

Question 29. Name the hormone that helps regulate the level of sugar in our blood. Name the gland that secretes it.
Answer: Insulin helps in regulating blood sugar levels. This hormone is secreted by the pancreas gland.

Question 30. Mention the function of the hindbrain in humans
Answer: The hindbrain coordinates the body’s movement and posture. It also controls respiration.

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