Descibe the layering method for the artifical propagation of plants. Illustrate your answer with the help of a labelled diagram. Name any five plants which are propagated by the layering method.

Explain the method used for the extraction of aluminium from its ore. Illustrate your answer with the help of a neat, labelled diagram.

(a) What is wind ? What type of energy is possessed by wind ? (b) Explain how, wind energy can be used to generate electricity. Illustrate your answer with the help of a labelled diagram. (c ) State two advantages of using wind energy for generating electricity. (d) Mention two limitations of wind energy for generating electricity.

Name the natural method by which strawberry plants are propagated.

Name a plant in which vegetative propagation takes place by means of leaves

Name any three plants in which natural vegetative propagation occurs through leaves.

Name the artificial propagation method used for the propagation of (a) rose plants and (b) apple trees.