9th Class (CBSE) Science: Improvement in Food Resources

Question: Name two variety of food required for milch animals.

Answer:

1. Maintenance requirement – food required to keep animal healthy
2. Milk producing requirement – food required for increased lactation Animal food includes roughage and concentrate also.

Question: State the meaning of capture fishing and culture fishing.

Answer:

1. Capture fishing: It is done from natural resources.
2. Culture fishing: It is done by fish farming.

Question: Name four marine fish varieties.

Answer: Pomphret, mackerel, tuna and sardines.

Question: What is apiculture?

Answer: Keeping bee for obtaining honey commercially is called apiculture.

Question: Name the products obtained from apiculture.

Answer: Honey and wax both are obtained from apiculture.

Question: What do we get from cereals, pulses, fruits and vegetables?

Answer:

1. Cereals give carbohydrates which provide energy.
2. Pulses give proteins which build our body.
3. Vegetables and fruits provide vitamins and minerals.

Question: How do biotic and abiotic factors affect crop production?

Answer: Factors responsible for loss of grains, during storage and production are:

1. Biotic factors like rodents, pests, insects etc.
2. Abiotic factors like temperature, humidity, moisture etc.

Combination of both biotic and abiotic factors causes:

1. infestation of insects
2. weight loss
3. poor germination ability
4. degradation in quality
5. discolouration
6. poor market price

Question: What are the desirable agronomic characteristics for crop improvements?

Answer: Desirable agronomic characteristics for crop improvements are:

1. Tallness and profuse branching are desirable characters for fodder crops.
2. Dwarfness is desired in cereals, so that less nutrients are consumed by these crops.

Question: What are macro-nutrients and why are they called macro-nutrients?

Answer: Macro-nutrients are the essential elements which are utilised by plants in large quantities. Many macro-nutrients are required by the plants for the following functions:

1. As the constituent of protoplasm
2. N, P, S are present in proteins
3. Ca is present in cell wall
4. Mg is important constituent of chlorophyll

Question: How do plants get nutrients?

Answer: Plants get nutrients from air, water and soil. There are, sixteen nutrients essential for the growth of plants. Carbon and Oxygen are supplied by water. The remaining thirteen nutrients are supplied by soil.