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#	Question	Answer
1	In unicellular organisms, which functions are performed by a single cell?	Digestion, respiration, and reproduction.
2	What does division of labour in multicellular organisms involve?	Cells, tissues, organs, and organ systems splitting up work for survival of the body.
3	Why are frogs called cold-blooded or poikilotherms?	Their body temperature varies with the temperature of the environment.
4	Why is the skin of a frog smooth and slippery?	Due to the presence of mucus.
5	Which body parts are absent in frogs?	Neck and tail.
6	Why are frog feet webbed?	To help in swimming.
7	How many digits are present in the hind limbs of frogs?	Five digits.
8	Which structures are present in male frogs but absent in female frogs?	Vocal sacs and copulatory pads on the first digit of forelimbs.
9	Through which structure does the buccal cavity lead to the oesophagus?	Pharynx.
10	Which digestive gland produces pancreatic juice?	Pancreas.
11	What does the duodenum receive through the common bile duct?	Bile from gall bladder and pancreatic juices from pancreas.
12	Through which opening does undigested waste pass out in frogs?	Cloaca.
13	Describe frog lungs.	Pair of elongated, pink coloured sac-like structures in the thorax.
14	What are the components of the lymphatic system in frogs?	Lymph, lymph channels, and lymph nodes.
15	What forms the venous system in frogs?	Veins collecting blood back to the heart.
16	Are frog RBCs nucleated or non-nucleated?	Nucleated.
17	Where are frog kidneys located?	Posteriorly in the body cavity on both sides of the vertebral column.
18	How are excretory wastes transported to the kidneys in frogs?	Through blood.
19	What are the components of the central nervous system in frogs?	Brain and spinal cord.
20	Into which three regions is the frog brain divided?	Forebrain, midbrain, and hindbrain.
21	Name the sense organs present in frogs.	Organs of touch, taste, smell, vision, and hearing.
22	Where are frog eyes situated?	In the orbit of the skull.
23	What is mesorchium?	A double fold of peritoneum that attaches the testes to the upper part of the kidneys.
24	Where do the oviducts open in frogs?	Separately into the cloaca.
25	What process converts tadpole into adult frog?	Metamorphosis.
26	Which glands in frog skin help in respiration?	Mucous glands in highly vascularised skin.