Ans. (a) Dendrite
 (b) Cell body
 (c) Axon
 (d) Axon terminal 

Column (A)	Column (B)
(a) Olfactory receptors	(i) Tongue
(b) Thermo receptors (temperature receptors)	(ii) Eye
(c) Gustatoreceptors	(iii) Nose
(d) Photoreceptors	(iv) Skin

 

Ans. (a)-iii
 (b)-iv
 (c)-i
 (d)-ii

Directional growth or movement in response to a stimulus is called tropic movement. For example; roots generally show positive geotropic movement, which means roots usually grow towards gravity.

Iodine is essential for manufacture of thyroxin in the body. If intake of iodine in our diet is low, it will reduce the production of thyroxin. This can result in hypothyroidism. It can even result in goiter.

The junction between two neurons is called synapse. When electrical impulse reaches the axonal end of a neuron, it sets off the release of neurotransmitters in the synapse. These neurotransmitters enter the dendrite of another neuron to set off electrical signal in that neuron. That is how electrical impulse travels from one neuron to another.

(a) Which hormone is responsible for the changes noticed in females at puberty?
 Ans. Oestrogen
(b) Dwarfism results due to deficiency of which hormone?
 Ans. Growth hormone
(c) Blood sugar level rises due to deficiency of which hormone?
 Ans. Insulin
(d) Iodine is necessary for the synthesis of which hormone?
 Ans. Thyroxin 

(a) Name the endocrine gland associated with brain?
 Ans. Pituitary
(b) Which gland secretes digestive enzymes as well as hormones?
 Ans. pancreas
(c) Name the endocrine gland associated with kidneys?
 Ans. Adrenal gland
(d) Which endocrine gland is present in males but not in females?
 Ans. Testis 

 

Function of Neuron: Neuron is the functional unit of nervous system. It carries electrical impulse from brain to different organs and vice-versa