Diversity in Living Organisms

A movable stalk supports the eyes present in molluscs. So, it is called as an eye stack of molluscs.

Herdmania is a tunicate. It belongs to the subphylum Urochordata and has a free swimming tadpole larva that shows retrogressive metamorphosis.

Class Bivalvia or Pelecypoda consists of filter feeder molluscs in which the shell is external and made up of two valves jointed dorsally by a hinge joint. Pinctada or pearl oyster is present in pelecypoda.

In Peripatus, there is the presence of primitive characters such as presence of cilia, nephridia, unjointed legs and there is the absence of external segmentation. Due to the presence of these characters, Peripatus is considered to be the most primitive arthropod.

The head and foot come together and fuse to form a cephalopod. Cephalopods have eyes similar to those of a vertebrate.

It is an echinoderm which has radial symmetry in adult phase and bilateral symmetry in the larval stage.

It is a lizard like semi-terrestrial nocturnal amphibian. It belongs to the class Urodela.

It is the sole representative of the Palaeozoic group of molluscs. It is also known as a living fossil.

Ichthyophis or blind worm is a limbless amphibian that lives in small burrows in moist soil, generally near tropical and subtropical areas of India and other South Asian countries. 

This is the correct answer. Viruses today are thought of as being in a gray area between living and nonliving: they cannot replicate on their own

Cephaleuros virescens is a parasitic green algae which causes red rust of tea and coffee. Cephaleuros belongs to class Chlorophyceae, order Chaetophorales and family. Threntepholiaceae.

Tobacco mosaic virus (TMV) is a positive-sense single stranded RNA virus that infects a wide range of plants, especially tobacco and other members of the family Solanaceae.

This is the correct answer as both these statements are correct.

This is the correct answer because these statements are correct. Mammals give birth to young ones. Mammals have a constant body temperature.

This is the correct answer. Skin helps in camouflaging. The patterns on the skin of the tiger helps it hide in the grass, from where it can catch its prey. The colour of the camel helps it camouflage itself in the desert sands. The colour of the fur of the polar bear helps it camouflage in the snow.