[1 Mark Question Answer]

Question 11 Mark

Why do adult amphibians tend to stay near water ?

Answer

Adult amphibians tend to stay near water because they have to return to water to reproduce and they always lay their eggs in water, e.g. frog.

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Question 21 Mark

What happens to the body temperature of a fish when the temperature of water drops ?

Answer

Since fish are cold blooded animals, the temperature of their body also drops when the temperature of water drops.

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Question 31 Mark

You are asked to classify an animal in the correct group. The animal has a soft body and arm-like tentacles. You dissect the animal and find that it has an internal shell. Is the animal a cnidarian or a mollusc ? Explain your answer.

Answer

The animal is a mollusc because although both molluscs and cnidarians have soft bodies and tentacles but only molluscs have shells (internal or external) and cnidarians don’t.

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Question 41 Mark

How do fish exchange gases ?

Answer

Fish exchange gases in water through gills. Gills enable the fish to obtain oxygen dissolved in the water.

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Question 51 Mark

Give two examples of Platyhelminthes.

Answer

Two examples of Platyhelminthes are tapeworms and liver fluke.

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Question 61 Mark

Write two examples of myriapods.

Answer

Centipede and Millipede

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Question 71 Mark

Name the special organs of excretion in annelids ?

Answer

Annelids have a special organ of excretion called nephridia

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Question 81 Mark

What do you mean by radially symmetrical body ?

Answer

Radially symmetrical body is the body that can be divided into two identical halves along any plane, e.g. Star fish, jelly fish.

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Question 91 Mark

What are invertebrates ?

Answer

Invertebrates are animals without a backbone, e.g. Insects, worms.

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Question 101 Mark

Find the odd one out
jellyfish, Hydra, sea anemone, butterfly

Answer

butterfly : butterfly is an insect whereas rest three are Cnidarians.

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Question 111 Mark

Find the odd one out
sea urchin, starfish, brittle star, jellyfish

Answer

jellyfish : jellyfish belongs to Cnidarians whereas the rest three are echinoderms.

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Question 121 Mark

Find the odd one out
snake, alligator, eel, turtle

Answer

eel: eel is a fish whereas the other three animals are reptiles.

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Question 131 Mark

Find the odd one out
snail, oyster, earthworm, octopus

Answer

earthworm: earthworm is an annelid whereas rest three are molluscs.

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Question 141 Mark

Find the odd one out
frog, shark, seahorse, carp

Answer

frog: frog is an amphibian while other three are fishes.

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Question 151 Mark

Find the odd one out
ant, cockroach, spider, dragonfly

Answer

spider : spider is odd one out because it is an arachnid whereas rest three are insects.

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Question 161 Mark

Most arthropods have a tough outer body covering called .

Answer

Most arthropods have a tough outer body covering called exoskeleton.

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Question 171 Mark

live in the digestive tract of many vertebrates including human beings.

Answer

Tapeworms live in the digestive tract of many vertebrates including human beings.

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BIOLOGY [1 Mark Question Answer]

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