Question:34- Label the parts (a), (b), (c) and (d) and show the direction of flow of electrical signals in the following figure.
Answer: (a) : Sensory neuron, (b): Spinal cord, (c): Motor neuron, (d): Effector
Question:35- Name the plant hormones responsible for the following
(a) Elongation of cells
(b) Growth of stem
(c) Promotion of cell division
(d) Falling of senescent leaves.
Answer: (a): Auxin, (b): Giberellin, (c): Cytokinin, (d): Abscissic acid
Question:36- Label the endocrine glands in the given figure.
Answer: (a) Pineal gland, (b): Pituitary gland, (c): Thyroid gland, (d) Thymus
Question:37: In the given figures, (a), (b) and (c), which appears more accurate and why?
Answer: Figure (a) appears more accurate because it is showing positive geotropic movement in roots and negative geotropic movement in stem.
Question:38. Label the parts of a neuron in the given figure.
Answer: (a): Dendrites, (b): Cyton, (c): Axon, (d): Axon terminals
Question:39. Match the terms of Column (A) with those of Column (B)
Question:40. What is a tropic movement? Explain with an example.
Answer: Tropic Movement: The movements which are in a particular direction in relation to the stimulus are called tropic movements. Tropic movements happen as a result of growth of a plant part in a particular direction. For example; the shoot usually grows in the direction of sunlight. This is called positive phototropic movement.
Question:41. What will happen if intake of iodine in our diet is low?
Answer: Iodine is an important constituent of thyroxine. Thyroxine governs the rate of general metabolism in the body. Lack of iodine in the diet can hamper general metabolism; which can lead to many complications. Moreover, deficiency of iodine also leads to a condition which is known as goiter. This manifests in the form of a permanent swelling in the neck.
Question:42. What happens at the synapse between two neurons?
Answer: Transmission of nerve impulses between two neurons takes place at through the synapse. The axon terminal of a neuron releases specialized chemicals; called neurotransmitters. These chemicals travel through the synapse and reach the dendrites of the next neuron. The nerve impulses travel along with the neurotransmitters.
Question:43. Answer the following :
(a) Which hormone is responsible for the changes noticed in females at puberty?
(b) Dwarfism results due to deficiency of which hormone?
Answer: Growth hormone
(c) Blood sugar level rises due to deficiency of which hormone?
(d) Iodine is necessary for the synthesis of which hormone?
Question:44. Answer the following:
(a) Name the endocrine gland associated with brain?
Answer: Pineal Gland
(b) Which gland secretes digestive enzymes as well as hormones?
(c) Name the endocrine gland associated with kidneys?
Answer: Adrenal Gland
(d) Which endocrine gland is present in males but not in females?
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