The leaves have a green pigment called chlorophyll. It helps leaves to
capture the energy of the sunlight.
Besides leaves, photosynthesis also takes place in green stems and green
branches. Desert plants have green stems which carry out photosynthesis.
Algae are nitrogenous substance which contains nitrogen.
A plant like cascuta (amarbell) does not have chlorophyll. It takes
readymade food from the plant on which it is climbing. The plant on which it
climbs is called a host. Since it deprives the host of valuable nutrients.
It is called a parasite.
Insectivorous plants:- these are insect eating plants. The insects is
digested by the digestive juices secreted in the pitcher, the pitcher like
structure is the modified part of the leaf.
Fungi have a different mode of nutrition. They secrete digestive juices
on the dead conert it into a solution. Then they absorb the nutrient from
it. This mode is called saprotrophic nutrition. Plants which use
saprotrophic mode of nutrition are called saprotrophs. Eg: A mushroom as a
Some organisms live together and share shelter and nutrients. This is
called symbiotic relationship. Organism like algae and fungus live together.
The fungus provides shelter. Water and minerals to the algae and in return
the algae provides food which is prepared by photosynthesis.
Rhizobium cannot make its own food. So it lives in the roots of gram,
peas, moong beans and other legumes and provides them nitrogen in return ,
the plants provide food and shelter to the bacteria, they have a symbiotic