Given below are sets of four terms. Choose the odd one and write the category of the remaining terms :

1. Jellyfish, Dogfish, Sea anemone, Hydra
2. Electric ray fish, Dogfish, Starfish, Shark
3. Myriapoda, Mammalia, Arachnida, Crustacea
4. Turtle, Tortoises, Crocodiles, Frog
5. Sucker, Tube feet, Muscular foot, Fins

Correct the following statements by changing the first/ last word only :

1. Amphibians breathe through lungs and gills.
2. Slimy scales are found on the body of reptiles.
3. Fins are covered and protected by an operculum.
4. Ascaris is a segmented flatworm.
5. Insects have four pairs of jointed legs.

Define the terms given below :

1. Heterotrophs
2. Locomotion
3. Invertebrates
4. Vertebrates
5. Mammals

Write one important function of the following structures along with the group (phyla/ class) of animals in which they are found:

1. Tentacles
2. Nephridia
3. Gills
4. Muscular foot
5. Mammary glands