NCERT Class-9 Science Solutions: Chapter 15-Improvement In Food Resources Part 4

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Question 20:

What is a GM crop? Name any one such crop which is grown in India.

Answer:

Crop which has been developed by introducing a new gene from any other source, to obtain the desired character, is called as genetically modified (GM) crop. But Cotton is an example of GM crop which is made insect resistant by introducing a new gene from a bacteria.

Image Cotton is an example of GM crop

Image Cotton is an Example of GM Crop

Image Cotton is an example of GM crop

Question 21:

List out some useful traits in improved crop.

Answer:

Useful traits of improved crops are

  1. Higher yield

  2. Improved nutritional quality

  3. Resistance to biotic and abiotic stresses

  4. Change in maturity

  5. Wide range of adaptability

  6. Desired agronomic characteristics

Question 22:

Why is organic matter important for crop production?

Answer:

Organic matter is important for crops because

  1. It helps in improving soil structure

  2. It helps in increasing water holding capacity of sandy soil

  3. In clayey soil large quantity of organic matter helps in drainage and in avoiding water logging

Question 23:

Why is excess use of fertilizers detrimental for environment?

Answer:

Excess use of fertilizers causes’ environmental pollution as their residual and unused amounts will become pollutants for air, water and soil.

The excessive use of fertilizer detrimental for the environment because when rain fall in the ground were fertilizer is used rain Carry's the fertilizer to nearby sea or river then the water becomes contaminated and the living organization cannot survive due to it pollution is also caused as we'll as the conditions of the living organization depleted.

Image fertilizers detrimental for environment

Image Fertilizers Detrimental for Environment

Image fertilizers detrimental for environment

Question 24:

Give one word for the following

  1. Farming without the use of chemicals as fertilizers, herbicides and pesticides is known as ___________.

  2. Growing of wheat and groundnut on the same field is called as ___________.

  3. Planting soyabean and maize in alternate rows in the same field is called ___________.

  4. Growing different crops on a piece of land in pre-planned succession is known as___________.

  5. Xanthium and Parthenium are commonly known as___________.

  6. Causal organism of any disease is called as ___________.

Answer:

  1. Farming without the use of chemicals as fertilizers, herbicides and pesticides is known as organic farming.

  2. Growing of wheat and groundnut on the same field is called as mixed cropping.

  3. Planting soyabean and maize in alternate rows in the same field is called as inter cropping.

  4. Growing different crops on a piece of land in pre-planned succession is known as crop rotation.

  5. Xanthium and Parthenium are commonly known as weeds.

  6. Causal organism of any disease is called pathogen.