Arrange this in correct order
A) Ploughing the soil
B) Adding fertilizers to make the soil fertile
C) Protecting crops from pests
D) Irrigation
E) Weeding
F) Sowing the seeds
Answers
Answer:
Q1. Select the correct word from the following list and fill in the blanks float, water, crop, nutrients,
preparation
(a) The same kind of plants grown and cultivated on a large scale at a place is called (b) The first step before growing crops is of the soil.
(c) Damaged seeds would.
(d) For growing a crop, sufficient sunlight (a) crop (b) preparation (e) float
on top of water.
(d)
and water, nutrients
from the soil are essential .
Ans.
Q2 Match items in Column A with those in Column B
Column A
(0) Kharif crops
(ii) Rabi crops
() Chemical fertilisers
(iv) Organic manure
Ans.
Column A
(i) Kharif crops
( (1) Rabi crops
(i) Chemical fertilisers
Column B
(a) Food for cattle
(b) Urea and super phosphate
(c) Animal excreta, cow dung, urine and plant wastes
, (d) Wheat, gram, pea
(e) Paddy and maize
Column B
(e) Paddy and maize
) (d) Wheat, gram, pea
b (b) Urea and super phosphate
(iv) Organic manure (c) Animal excreta, cow dung, urine and plant wastes
Q3. Give two examples of each
(a) Kharif crop (b) Rabicrop
Ans. (a) Paddy and maize (b) Wheat and gram.
Q.4. Write a paragraph in your own words on each of the following:
(a) Preparation of soil
(b) Sowing
(c) Wedding
(d) Threshing Ans. (a) Preparation of soil: Soll is prepared before sowing the seeds. The soil is loosened to increase the
absorption of water and manures. Loosening of soil particles adds humus and nutrients in the soil that increases crop yields. Tilling or loosening the soil is done by ploughs which are pulled by a pair of bulls. Tractor driven cultivators are also used to loosen the soil
(b) Sowing: After preparation of soil it is ready for sowing of seeds. The healthy and clean seeds should be selected. The sowing is done by seed drills or funnel shaped tools. Seed drills are the modern
instruments which sow the seeds at proper depth and proper distance. (c) Weeding: The unwanted plants in the crops are called weeds. These weeds absorb the nutrients
from the soil. So it is necessary to remove them. Weeds are either removed manually or by mechanical tools. The process of removal of weeds is called weeding. Some chemicals like 2, 4-D are also used to kill the weeds.
(d) Threshing. Separation of grains from the chaff is called thres hing. When the crop is harvested, it is cut along with the stalks. They are then separated and the grains are removed. Winnowing machine is used
to separate grains from chaff Q5. Explain how fertilisers are different from manures
Ans. (0) Manures are organic substances while fertilisers are chemical substances
(i) Manures are prepared in fields while fertilisers are prepared in factories (i) Manutes contain all the nutrients while fertilsers are rich in certain nutrients
(iv) Manures provide humus while fertilisers do not provide any humus
Q6. What is irrigation ? Describe two methods of irrigation which conserve water.
Ans. The process of watering the crops is called irrigation.
Two methods of irrigation are: () Sprinklers Sprinklers work as fountains. Long perpendicular pipes have holes regular
distances. When water is supplied, it comes out of these holes and spray water in field. These holes have rotating nozzles which sprinkle water in all directions. They control wastage of water. (ii) Drip System: This system is used to save water as it allows the water to flow drop by drop at the
roots of the plants. It is the best technique for watering fruit plants, gardens and trees: Water is not wasted at all
Q.7. If wheat is sown in the kharif season, what would happen? Discuss. Ans. Wheat crop does not require much water to grow, so wheat would not grow in kharif season. The seeds
would get destroyed in excess water due to rainy season. Q8. Explain how soil gets affected by the continuous plantation of crops in a field.
Ans. If we sow continuously in a field then the lacking of nutrients takes place in the soil. The field becomes
unfertile. It does not give any time to soil to replenish the nutrients. Thus the soil is unable to sustain any further healthy and good crop
Q9. What are weeds? How can we control them?
Ans. Weeds are unwanted plants. They grow with crops. They compete for nutrients and water with main crop. So weeds are very harmful Process of controlling the weed is called weeding. Weeding is done manually
by using khurpi and by using mechanical machines. Weeds are also controlled by using some chemical
substances like 2, 4-D These chemicals are called weedicide and used to kill and destroy the weed