11. Which of the following is a cold blooded animal?
(a) Whale
(b) Penguin
(c) Otter
(d) Tortoise
12. The bats are able to fly in dark because their wings produce:
(a) Sound waves
(b) Ultrasonic waves
(c) Infra-red rays
(d) Ultraviolet rays
13. The earthworm increases the fertility of soil because it:
(a) Adds nitrogen to it
(b) Survives by eating harmful bacteria of soil
(c) Turns over large masses of soil
(d) Its secretion makes fertilizers easily dissolvable
14. Silk is produced by:
(a) Egg of silkworm
(b) Pupa of silkworm
(c) Larva of silkworm
(d) Insect itself
15. About 80% of the body weight in most organisms is:
(a) Protein
(b) Minerals
(c) Water
(d) Fat
16. Penicillin is produced from:
(a) Yeast
(b) Algae
(c) Mould
(d) Mushroom
17. Poison glands of snakes are homologous to:
(a) Stings of rays
(b) Salivary glands of vertebrates
(c) Electric organs of fishes
(d) Sebaceous glands of mammals
18. Insects that make a clicking sound are:
(a) Flies
(b) Crickets
(c) Beetles
(d) Cockroaches
19. The functional kidney in adult amphibians is:
(a) Pronephros
(b) Metanephros
(c) Mesonephross
(d) Opisthonephros
20. Bee dance are meant for:
(a) Communication
(b) Recreation
(c) Courtship
(d) None of these