- The root serves the following functions :
1. It fixes the plant in the soil.
2. Absorbs water and minerals from the soil for the entire plant.
3. It acts as a storage part for food materials for certain plants.
4. It binds the soil together so that it does not get washed away during rain or blown over by the wind.
- Venation: Arrangement of pattern of veins in a lamina is called venation.
It is mainly of two types :
1. Reticulate venation : Veins and veinlets are irregularly distributed in the lamina forming a network.
Example: mango, guava.
2. Parallel venation: Veins run parallel to each other
Example: Banana, grass, wheat
- Modification of leaves in Venus flytrap (an insectivorous plant) The leaves of Venus flytrap have long pointed hair. It is divided into two parts having midrib in between like a hinge. When an insect visits the leaf, it closes its two parts and traps the insect. The insect is then digested by secreting digestive juices.
- The two main functions of leaves are –
1. Photosynthesis – Green leaves contain chlorophyll which, in presence of sunlight, manufacture food using carbon-dioxide and water.
2. Transpiration – Surface of leaves have minute pores which help in loss of water by evaporation. It has cooling effect making roots absorb more water due to suction.
1. Bryophyllum is a plant whose leaves produce adventitious buds in their margin.
2. The adventitious buds grow into new plants when they fall off from the parent plant.