Question 14
State whether the following statements are True or False. Correct the false statements.

(i) Using good quality seed is the only criterion to get high yield.
(ii) Growing different crops in different seasons in the same field will deplete the soil of nutrients.
(iii) All crop plants are sown as seeds in the field.
(iv) Cells of root nodules of leguminous plants fix nitrogen.
(v) Freshly harvested grains must be dried before storing.

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Solution

(i) False
(ii) False
(iii) False
(iv) True
(v) True

(i) Good qualtiy seeds is not the only criterion for getting a high yield. Other factors such as proper irrigation, removal of weeds and pests, and efficient harvesting also contribute to a high yield.
(ii) Growing different crops in different seasons (crop roatation) give the soil time to recuperate from nutrient deficiency and hence helps to maintain the nutrient balance of the soil.
(iii) Some crops are planted as seedlings. E.g. paddy.
(iv) The leguminous plants like pea, pulses have Rhizobium bacteria at the root nodules which help in the fixation of atmospheric nitrogen.
(v) Freshly harvested grains must be dried well before storing as it avoids spoilage due to microbial action. The microbes grow in a moist environment. Hence moisture elimination via drying is necessary before storing the grains.

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Similar questions

Q. State whether the following statements are true or false. Correct the false statements.
Using good quality seed is the only criterion to get high yield.

Q. Growing different crops in different seasons in the same field will deplete the soil of nutrients.

Fill in the following blanks with suitable words :

(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 soil.

(d) Damaged seeds would___on top of water.

(e) Crop rotation helps in the replenishment of soil with___

(f) The supply of water to crops at different intervals is called___

(g) The unwanted plants present in a crop field are called___

(h) Dried___ leaves are used for storing food grains at home.

(i) Many people living in the___areas consume fish as a major part of their diet.

Question 8
Given below are statements about the harmful effects of weeds on crop plants.
(i) They interfere in harvesting.
(ii) They help crop plants to grow healthily.
(iii) They compete with crop plants for water, nutrients, space and light.
(iv) They affect plant growth.

Choose the correct combination of statements.
(a) i, iii, iv
(b) iii only
(c) iii, iv
(d) i, ii, iii, iv

State whether the following statements are ‘True’ or ‘False’ and if false rewrite them correctly:

1. All crop plants need the same period of exposure to sunlight.

2. A crop of cereal helps in enhancing the fertility of the soil.

3. Setting up of apiaries in the fields is a good practice.

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Preparation of Soil

Standard VIII Biology

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