Question

Write very short answers.

1. What are the modes of Animal reproduction?

2. Gametes fuse to form _________?

3. Give an example of a unicellular

4. Define deforestation.

5. State one natural cause of deforestation.

6. Define combustion

7: What are the two types of Natural Resources?

8. Give examples of some metals and non-metals.

9. Why bells in temples are made up of metal?

10. Define synthetic fibres.

11. Microorganisms are classified into four major groups. Name them.

12. Define crop.

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Answer 1

$1.Just as in plants, there are two \\ \\ modes by which animals \\ \\ reproduce. \\ \\ These are \\ \\ : (i) Sexual reproduction, \\ \\ (ii) Asexual reproduction. in \\ \\ humans and study the process \\ \\ of reproduction in them.$

$3.Escherichia coli. \\ </p><p></p><p>Diatoms. \\ </p><p></p><p>Protozoa. \\ </p><p></p><p>Protista. \\ </p><p></p><p>Streptococcus. \\ </p><p></p><p>Pneumococci. \\ </p><p></p><p>Dinoflagellates. \\ </p><p></p><p>$

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Answer 2

1. sexual reproduction

2. zygote

3. ameoba

4. deforestation : cutting down of trees lead to deforestation

5. cutting down of trees for commercial purposes

6.combustion : it is a chemical process in which a substance react rapidly with oxygen and gives off heat.

7. water , fossil fuels comes under the category of natural resources

8. metals : copper , zinc , iron

non metals : chlorine bromine oxygen

9. bells in temples are made of metal because metals are sonours

10. synthetic fibre : artificial fibre are called synthetic fibre eg. polyester