MCQ OF CONTROL & CO-ORDINATION CLASS X

CONTROL &  CO-ORDINATION

CLASS: X

1. 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.

2. 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.

3. 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.

4. 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

5. The movement of plant organs in response to the force of gravity is called
(A) hydrotropism (B) geotropism (C) heliotropism (D) phototropism

6. A high concentration of synthetic auxins is generally used for
(A) wee control (B) preventing the growth of the lateral buds.
(C) controlling of cell enlargement (D) enhancing root initiation

7. Gibberellic acid has been  employed to induce flowering
(A) long day conditions for  short day plants   (B) for some plants
(C) short day conditions for  in long day plants  (D) none of these

8. Cytokinins are known to
(A) inhibit cytoplamic movement (C) help in retention of chlorophyll
(C) influence water movement (D) promote abscission layer formation

9. Ethylene is a
(A) solid hormone (B) gaseous enzyme (C) gaseous hormone (D) liquid gas mixture

10. Pineapple an be made to flower if off season by
(A) zeatin (B) ethylene (C) temperature (D) short days

11. The effect of daily light period on flowering is called
(A) photooxidation (B) phototropism (C) photoperiodism (D) photorespiration

12. 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

13. Number of spinal nerves in man are
(A) 11 pairs (B) 13 pairs (C) 6 pairs (D) 31 pairs

14. Third ventricle occurs in
(A) cerebrum (B) cerebellum (C) medulla oblongata  (D)  All of these  (E) none of these

15. 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

16. 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

17. Autonomic nervous system controls
(A) reflex action (B) sense organs (C) internal organs (D) skeletal muscle

18. The study of nervous system and its disorders is called
(A) neurogenesis (B) hematology (C) neuroglia (D) neurology

19. The sensation of sight in human brain is perceived by
(A) optic lobe (B) occipital lobe (C) frontal lobe (D) parietal lobe

BY
ARANBIR SINGH