What is chlorophyll ? What part does chlorophyll play in photosynthesis?

Name the biological catalysts which bring about chemical digestion of food.

Fill in the following blanks with suitable words:

(a) All green plants are...........

(b) All non-green plants and animals are ..............

(c) Heterotrophs depend on ............. and other ................... for food.

(d) Green plants use ............ and ............... to make food.

(e) Iodine turns blue-black on reacting with ........................

(i) Which simple food is prepared first in the process of photosynthesis ?

(ii) Name the food which gets stored in plant leaves.

What criteria can be used to decide whether something is alive?