CBSE Class 10 Science Control and Coordination Assignment Set D

Question. Phytohormones are
(a) hormones regulating growth from seed to adulthood
(b) hormones regulating secondary growth
(c) growth regulators synthesized by plants and influencing physiological processes
(d) hormones regulating flowering.

Answer: C

Question. The effect of daily light period on flowering is called
(a) photooxidation
(b) phototropism
(c) photoperiodism
(d) photorespiration

Answer: C

Question. The natural plant hormones were first isolated from
(a) cotton fruits, spinach leaves, rice plant
(b) avena coleoptiles, fungus gibberella
(c) corn germ oil, human urine
(d) human urine, rice plant.

Answer: B

Question. Brain stem is formed by the union of
(a) optic lobes
(b) cerebellum with optic lobes
(c) corpora striate
(d) mid brain, ponsvarolli and medulla oblongata

Answer: D

Question. Number of spinal nerves in man are
(a) 11 pairs
(b) 13 pairs
(c) 6 pairs
(d) 31 pairs

Answer: D

Question. If the tip of a seeding is cut off, growth as well as bending ceases because it hampers
(a) perception of light stimulus
(b) transpiration
(c) respiration
(d) photosynthesis.

Answer: A

Question. A plant bends towards the source of light when exposed to the light on only one side. Which of the following is the best explanation of the phenomena ?
(a) It needs light for photosynthesis
(b) The apices of their stems are attracted by light
(c) Some auxin accumulates on the shaded side to induce greater cell elongation on that side
(d) Light stimulates the cells on the illuminated side to increase in
length

Answer: C

Question. Third ventricle occurs in
(a) cerebrum
(b) cerebellum
(c) medulla oblongata
(d) diencephalon

Answer: D

Question. The pineal body is considered as
(a) an endocrine gland
(b) an organ concerned with voluntary actions
(c) an organ concerned with vision
(d) a vestige of third eye and endocrine gland

Answer: D

Question. The movement of plant organs in response to the force of gravity is called
(a) hydrotropism
(b) geotropism
(c) heliotropism
(d) phototropism

Answer: B

Question. A high concentration of synthetic auxins is generally used for
(a) wee control
(b) enhancing root initiation
(c) controlling of cell enlargement
(d) preventing the growth of the lateral buds.

Answer: A

Question. Part of brain involved in interpretation, storage of information and initiation of response on the basis of past experience is
(a) motor area
(b) cerebellum
(c) sensory area
(d) association area

Answer: D

Question. Autonomic nervous system controls
(a) reflex action
(b) sense organs
(c) internal organs
(d) skeletal muscle

Answer: C

Question. Gibberellic acid has been successfully employed to induce flowering
(a) in long day plants under short day conditions
(b) in short day plants under long day conditions
(c) for some plants
(d) none of the above

Answer: A

Question. Cytokinins are known to
(a) inhibit cytoplamic movement
(c) help in retention of chlorophyll
(c) influence water movement
(d) promote abscission layer formation

Answer: B

Question. The study of nervous system and its disorders is called
(a) neurogenesis
(b) hematology
(c) neuroglia
(d) neurology

Answer: D

Question. In reflex action the reflex arc is formed by
(a) brain spinal cord muscles
(b) receptor spinal cord muscles
(c) muscle receptor brain
(d) muscles spinal cord receptor

Answer: B

Question. Ethylene is a
(a) solid hormone
(b) gaseous enzyme
(c) gaseous hormone
(d) liquid gas mixture

Answer: C

Question. Pineapple an be made to flower if off season by
(a) zeatin
(b) ethylene
(c) temperature
(d) short days

Answer: B

Question. The sensation of sight in human brain is perceived by
(a) optic lobe
(b) occipital lobe
(c) frontal lobe
(d) parietal lobe

Answer: B

Question. The sensation of sight in human brain is perceived by
(a) optic lobe
(b) occipital lobe
(c) frontal lobe
(d) parietal lobe

Answer: B