(a) Oldest forms of bacteria that have survived almost all the geological changes of earth are grouped in which category ? Where do they live ?
(a) Give atleast two examples of cyanobacteria and their role in the environment .
(b) Name atleast two example of protista, algae and their role in aquatic ecosystem.

Why do the terrestrial life forms required fresh water? (b) Give two examples where fresh water can be found in the frozen form on the Earth.

(a) which disaccharide is the major sugar of insect haemolymph. (b) Give atleast two examples of unsaturated fatty acids. ( c) Differentiate between saturated and unsaturated fatty acids (atleast 3 differences).

there is a large group of materials P which all the divided into three groups Q ,R and S on the basis of their properties ,THe substance belonging to group Q can be solids liquids or gases ,The solids belonging to group Q arae usually electrical insulators Most of the substance of groups R are solids which are good like R. the properties of s are intermediate between those of Q and R. (a) what could the group of materials Pbe ? (b) Name the substance Q GIve two example of such substance. (c ) Name the substance R write two example of such substance . ( D) Name the substance S . Give two example of such substance . ( e) out of Q ,R and S , which substance are malleable and ductile ?

(a) Name the phenomenon which helps fresh water unicellular organisms (e.g., Amoeba) continuosuly gain water in their bodies. Also name the mechanisms by which these organisma throw out exces of water from their bodies. (b) Give at least two examples in plants where similar phenomenon in used to gain water.