Q11Multiple choice
The main function of abscisic acid in plants is to
This question refers to a figure in the original PDF.
- (a)increase the length of cells
- (b)promote cell division
- (c)inhibit growth
- (d)promote growth of stem 58 E XEMPLAR P ROBLEMS –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he movement of sunflower in accordance with the path of sun is due to (a) phototropism (b) geotropism (c) chemotropism (d) hydrotropism 20. The substance that triggers the fall of mature leaves and fruits from plants is due to (a) auxin (b) gibberellin (c) abscisic acid (d) cytokinin 21. Which of the following statements about transmission of nerve impulse is incorrect? (a) Nerve impulse travels from dendritic end towards axonal end (b) At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron (c) The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron (d) A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells 22. Involuntary actions in the body are controlled by (a) medulla in fore brain (b) medulla in mid brain (c) medulla in hind brain (d) medulla in spinal cord 23. Which of the following is not an involuntary action? (a) Vomiting (b) Salivation (c) Heart beat (d) Chewing 24. When a person is suffering from severe cold, he or she cannot (a) differentiate the taste of an apple from that of an ice cream (b) differentiate the smell of a perfume from that of an agarbatti (c) differentiate red light from green light (d) differentiate a hot object from a cold object 60 E XEMPLAR P ROBLEMS –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he hormone which increases the fertility in males is called (a) oestrogen (b) testosterone (c) insulin (d) growth hormone 31. Which of the following endocrine glands is unpaired? (a) Adrenal (b) Testes (c) Pituitary (d) Ovary 32. Junction between two neurons is called (a) cell junction (b) neuro muscular junction (c) neural joint (d) synapse 33. In humans, the life processes are controlled and regulated by (a) reproductive and endocrine systems (b) respiratory and nervous systems (c) endocrine and digestive systems (d) nervous and endocrine systems 5JQTV #PUYGT 3WGUVKQPU 34. Label the parts (a), (b), (c) and (d) and show the direction of flow of electrical signals in Figure 7.2. Fig. 7.2 62 E XEMPLAR P ROBLEMS –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nswer the following : (a) Which hormone is responsible for the changes noticed in females at puberty? (b) Dwarfism results due to deficiency of which hormone? (c) Blood sugar level rises due to deficiency of which hormone? (d) Iodine is necessary for the synthesis of which hormone? 44. Answer the following : (a) Name the endocrine gland associated with brain? (b) Which gland secretes digestive enzymes as well as hormones? (c) Name the endocrine gland associated with kidneys? (d) Which endocrine gland is present in males but not in females? .QPI #PUYGT 3WGUVKQPU 45. Draw the structure of a neuron and explain its function. 46. What are the major parts of the brain? Mention the functions of different parts. 47. What constitutes the central and peripheral nervous systems? How are the components of central nervous system protected? 48. Mention one function for each of these hormones : (a) Thyroxin (b) Insulin (c) Adrenaline (d) Growth hormone (e) Testosterone. 49. Name various plant hormones. Also give their physiological effects on plant growth and development. 50. What are reflex actions? Give two examples. Explain a reflex arc. 51. “Nervous and hormonal systems together perform the function of control and coordination in human beings.” Justify the statement. 52. How does chemical coordination take place in animals? 53. Why is the flow of signals in a synapse from axonal end of one neuron to dendritic end of another neuron but not the reverse? 64 E XEMPLAR P ROBLEMS – SCIENCE
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(c) inhibit growth