CBSE Guide with solutions of additional CBSE Guess questions for Chapter 7, Control and Coordination


Class 10 Science - Control and Coordination

CBSE Guide | Solved CBSE Guess Questions | CBSE Hots

Question 1: Which part of the brain gives rise to spinal cord?
Answer: Medulla oblongeta.

Question 2: What are the names of future shoots and future roots in a germinating seed?
Answer: Plumule and Radicle respectively.

Question 3: Which group of multi-cellular animals do not possess neurons?
Answer: Sponges.

Question 4: What are motor neurons?
Answer: Motor neurons transmit messages from the brain to the muscles and glands.

Question 5: Name the systems in animals which help in the process of control and coordination.
Answer: (i) Nervous System.
              (ii) Hormonal (Endocrine) System.

Question 6: Name the largest cell in the human body.
Answer: Nerve cell or neuron.

Question 7: Name the male and female sex hormones. Name the gland that secrets these hormones.
Name the hormones secrets at puberty males and females.
Answer: Male sex hormone is Testosterone and female sex hormone is Oestrogen. These hormones are secreted by the pituitary gland.

Question 8: What is tropism?
Answer: Directional growth of a plant, or part of a plant, in response to an extrenal stimulus such as gravity or light is termed as tropism.

Question 9: Define the terms Geotropism, Hydrotropism, Phototropism and Chemotropism with examples.
Answer: For answer visit: 

Question 10: How do animal muscles move in order to perform an action or movement?
Answer: When a nerve impulse reaches the muscle, muscle cell changes its shape and shortens. The muscle cells have special proteins, which in response to nervous electrical impulses change their shape and their arrangement in the muscle cell. The new arrangement of proteins makes the muscle cells shorter resulting in the contraction of muscles.

Question 11: How are the animal movements different from that of the plant movements?
Answer: Animals have a nervous system for coordinating and controlling the body movements. Plants do not have any nervous system and muscles. In plants, the movements are of two types: growth dependent and independent of growth. Movements which are independent of growth are controlled by turgidity of cells which occur as a result of a change in osmotic pressure.

Question 12: (a) Define nastic movement. (b) What type of coordination is present in plants?
(a) Nastic movements are non-directional responses to stimuli (eg., temperature, humidity, light). The movement can be due to changes in turgor pressure or changes in growth. Nastic movements differ from tropic movements in that the direction of tropic responses depends on the direction of the stimulus, whereas the direction of nastic movement is independent of stimulus.
(b) In plants there is only chemical coordination.

Question 13: Which is the largest endocrine gland?
Answer: Largest endocrine glands are thyroid gland.

Question 14: Name the master endocrine gland of human body.
Answer: The master endocrine gland is one which controls other endocrine glands. Pituitary gland is the master endocrine gland.

Question 15: Name the fluid that protects the brain from mechanical shocks.
Answer: The fluid that protects the brain from mechanical shock is cerebro spinal flu.

Question 16: Give four examples of simple human reflexes.
(i) Knee-jerk reflex in which the leg is involuntarily extended forward as a result of a sharp tap below the knee-cap in a relaxed (freely hanging) leg.
(ii) Closing of the eyelids when an object suddenly approaches the eye or when a strong beam of light is flashed across.
(iii) Withdrawal of the hand on pricking a pin or a thorn.
(iv) Movement of the diaphragm.

Question 17: What are the main divisions of nervous system?
(i) It is a system of conducting tissues that receives stimulus and transmit it to other parts of the body forming network.
(ii) It is the most important for regulation, control and coordination of body functions.
(iii) Comprises of neurons, nerves and nervous organs.
(iv) Vertebrate nervous system consists of two parts: (a) Central Nervous System (CNS) including brain and spinal cord. (b) Peripheral Nervous System (PNS) including cranial, spinal and visceral nerves.
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