1. Name the respiratory organs
of (a) Fish (b) Mosquito (c) Earthworm (d) Dogs
Answer: (1) gills (2) Trachea (3) Skin (4) lungs
2. Although bile juice has no
digestive enzyme. It is still considered to be very important for digestion
of food .Give two reasons.
Answer: (1) Bile juice helps in
to emulsify fat. (2) Due to basic nature it neutralizes the acidic traces
reaching the small intestine.
3. What is osmoregulation? How
does it takes place in human beings ?
Answer: Balance the water &
salt level in body is called osmoregulation. It takes place nephron by the
ADH (anti diuretic hormone). It effects the permeability of cells of
nephron for absorption of water.
4. Define phototropism. Which
hormone is responsible for it . How?
Answer: The growth movement of plants induced by
stimulus of light is called phototropism.
Auxins hormone is responsible
for it.High amount of Auxins is present in shady or dark half region of
shoot apex which causes high growth & turns the plant towards light
5. Mention the name of secretory
part / gland and function of following hormones.-
Insulin (b) Progesterone ( c )Oxytocin
Answer: (1) Insulin –beta cells
of pancreas, control sugar level
(2) Progesterone – carpus leutium of
ovary, maintains pregency & fixes the embryo to uterus wall.