NCERT Class-9 Science Solutions: Chapter 15-Improvement In Food Resources Part 6

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Question 31:

Fill in the blanks

  1. A total of__________nutrients are essential to plants.

  2. __________and__________are supplied by air to plants.

  3. __________is supplied by water to plants.

  4. Soil supply__________nutrients to plants.

  5. __________nutrients are required in large quantity and called as__________.

  6. __________ nutrients are needed in small quantity for plants and are called __________.

Answer:

  1. A total of 16 nutrients are essential to plants.

  2. Carbon and Oxygen are supplied by air to plants.

  3. Hydrogen is supplied by water to plants.

  4. Soil supply 13 nutrients to plants.

  5. Six nutrients are required in large quantity and called as macronutrients.

  6. Seven nutrients are needed in small quantity for plants and are called micronutrients.

Question 32:

Differentiate between Compost and Vermicompost?

Answer:

Compost and Vermicompost
Compost and Vermicompost

Compost

Vermicompost

It is prepared from all type of organic wastes like sewage, animal refuse, farm waste, etc., and takes 3-6 months to prepare.

It is prepared from domestic waste, vegetable waste and takes 1-2 months to prepare.

Organic remains are decomposed by microbes.

Organic remains are pulverized by earthworms.

Figure shown the Compost

Figure Shown the Compost

Figure shown the Compost

Image the Vermicompost

Image the Vermicompost

Image the Vermicompost

Question 33:

Arrange these statements in correct sequence of preparation of green manure.

  1. Green plants are decomposed in soil.

  2. Green plants are cultivated for preparing manure or crop plant parts are used

  3. Plants are ploughed and mixed into the soil.

  4. After decomposition it becomes green manure.

Answer: (b) → (c) → (a) → (d)

Question 34:

An Italian bee variety A. mellifera has been introduced in India for honey production. Write about its merits over other varieties.

Answer:

Merits of Italian bee variety A. mellifera are:

  1. It stings less.

  2. It has high honey collection capacity.

  3. It stays in given bee-hive for long periods and breeds very well.

Question 35:

In agricultural practices, higher input gives higher yield. Discuss how?

Answer:

In agricultural practices, higher input gives higher yield. This means higher money input to raise the yield. Financial conditions of the farmers allows them to take up different farming practices and technologies. The farmer’s purchasing capacity for input decides cropping system and production practices.