pre -mid exam science,Class8

1. 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.

Separating grains from chaff is called:

• (a) winnowing

• (b) threshing

• (C)fallow

• (d) harvesting.

Kharif crops are sown in

• (a) March, April

• (b) May, June

• (c) October, November

• (d) Any time.

2-4D is a

• (a) Pesticides

• (b) Insecticides

• (c) Fungicides

• (d) Weedicides.

8. Malaria Is caused by

• I. Protozoa

• II. Virus

• III. Algae

• IV. Bacteria

. Rhizobium becteria

• I. Help in digestion

• II. Help in nitrogen fixation

• III. Cause diseases

• IV. All of the above

6. Scientist who discovered fermentation is

• I. Alexander Fleming

• II. Louis Pasteur

• III. John Mendal

• IV. Edward Jenner

Amoeba belongs to

• I. Algae

• II. Fungi

• III. Protozoa

• IV. Virus