Question

1. Choose the correct option:
Watering the crops is called:
(a) sowing
(b) manuring
(c) tilling
(d) irrigation
2. Weeds are the:
(a) main crop plants
(b) insects and pests
(c) unwanted plants growing along the crop
(d) chemical substances
3. Combines are used for:
(a) sowing of seeds
(b) harvesting the crops
(c) threshing
(d) harvesting and threshing both.
4. Separating grains from chaff is called:
(a) winnowing
(b) threshing
(c) fallow
(d) harvesting.
5. Weedicides are used to destroy:
(a) insects
(b) weeds
(c) pests
(d) none of these.
6. Kharif crops are sown in
(a) March, April
(b) May, June
(c) October, November
(d) Any time.
7. Wheat and gram belong to
(a) Rabi crops
(b) Kharif crops
(c) Both of these
(d) None of these.
8. Examples of kharif crops are
(a) Wheat and maize
(b) Gram and maize
(c) Paddy and maize
(d) All of these.
9. 2-4D is a
(a) Pesticides
(b) Insecticides
(c) Fungicides
(d) Weedicides.
10. Seed drill is used to
(a) sow the seeds
(b) remove the weeds
(c) remove the pest
(d) mix manure in the soil.


Fill in the blanks:
1. ___________ bacteria causes citrus canker.
2. ___________ is a skin disease in human caused by fungus.
3. The female Aedes mosquito is a carrier of the ________virus.
4. _______, ______ are chemicals that inhibit microbial growth.
5. When an antigen enters the body, the body produce proteins called ________ to destroy it.
6. A _________ is used to study microbes.
7. ________ is a unicellular fungus.
8. ________ made the first vaccine.
9. ________ microbe is present in our intestine as a friendly microbes.
10. ________ can kill disease causing microbes without causing injury to body.
11. _________ are on the borderline of living and non- living.
12. _______and ______ are two diseases caused by bacteria.
13. In legumes, the root nodules contain the bacterium_________.
14. Yeast is added to dough to produce _________which makes the dough rise.
15. The heating of milk upto to 70*C& then suddenly cooling is called _________.

Answer The Following:

1. Why Kharif crops cannot be grown in Rabi season?
2. What are the steps involved in soil preparation?
3. Name the medium in which plants grow.
4. Why is it necessary to dry grains before storing them?
5. How are manures prepared by the farmers?
6. What are viruses? Name some common diseases in human caused by virus.
7. Explain the formation of curd from the milk.
8. Mention some beneficial effects of bacteria.
9. Explain the discovery of Pencillin.
10. How do microorganisms spoil food?
11. What are carriers of disease causing microbes? Explain with the help of two examples.
12. Explain nitrogen cycle and draw a schematic diagram of nitrogen cycle.
13. Name some common plant diseases their causative microorganisms mode of transmission with the help of the figures.
14. Explain the uses of Bacteria, Fungi and Algae.
15. What are food preservatives? Explain some common food preservatives.

Answer 1

Answer:

1 d . irrigation

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2 c. unwanted plants