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81.

The echinoderms are

82.

Tube feet is the locomotory organ in

83.

Sea gulls excrete excess of NaCl from

84.

Connecting link between annelids and molluscs is

85.

Ruminants belong to order

86.

Which of the following have notochord throughout life?

Gemmule

Unfavourable conditions such as high temperature, dry conditions, sponges body gets divided into numerous small spore like bodies called gemmules.

In Amoeba, cysts are formed during unfavourable conditions.

Spicules are endoskeleton of sponge body.

88.

Shell of molluscs is derived from

89.

Which of the following cell type is capable of giving rise to other cell types in sponges?

90.

Animals having a built in thermostat to maintain constant body temperature are known as