Available Answers

1. 1.

   Write one word for each of the following.

   1. The process of cutting and gathering of crops.
   2. Plant-like organisms that do not contain chlorophyll.
   3. Fibres obtained from coal, petroleum and natural gas.
   4. The property by virtue of which metals can be beaten into thin sheets.
   5. This type of coal has the least carbon content.
   6. The lowest temperature at which the substance starts burning in the presence of oxygen.
   7. The plant and animal species confined to a particular region.
   8. Plants and animals made up of single cell.
   9. The gland of emergency.
   10. Yeast and Hydra show this type of reproduction.
2. 2.

   Match the following.

   COLUMN A	COLUMN B
   1. Chlamydomonas	a. Extinct
   2. Bakelite	b. Combustion
   3. Anthracite	c. Metals
   4. Oxygen	d. Kharif crop
   5. Sonorous	e. Voice box
   6. Dodo	f. Ovum
   7. Cell wall	g. Thermosetting plastic
   8. Adam's apple	h. Algae
   9. Ovaries	i. Plant cell
   10. Rice	j. Coal

    

3. 3.

   What are the various methods of irrigation?

4. 4.

   What are the different types of microorganisms? Give example of each.

5. 5.

   Mention the advantages and disadvantages of synthetic fibres.

6. 6.

   What is corrosion? Explain giving examples.