Science M.C.Q. [I MARKS]

 Seeds should not be sown in dry soil because water is necessary for germination of seeds.

Paddy, tomatoes and chillies are grown by transplantation.

The removal of unwanted plants called weeds is called weeding.

Sprinkler system is more suitable for uneven land where sufficient water is not available.

The process of beating out grains from the harvested wheat crop is called threshing. It is done by a machine called combine.

The Rhizobium bacteria present in the root nodules of pea plants can fix nitrogen.

The nitrogen-fixing bacteria present in root nodules of leguminous plants is rhizobium bacteria. Rotation of crops (leguminous and non-leguminous crops) in the same field replenishes the soil with nitrogen naturally and increases the soil fertility.

Explanation:
The sowing of seeds by hand is called broadcasting.

The two crops which are not grown by sowing their seeds directly into the soil in large fields are tomatoes and chillies.

The food obtained from animals is very rich in proteins.

Explanation:
Poultry gives us meat as well as eggs.

In this system, there is a network of narrow pipes with small holes, in the fields. When water flows through these pipes, water falls drop by drop just at the position of the roots. So, it is called drip system. Water is not wasted at all. It is the best technique for watering fruit plants, gardens and trees.

Explanation:
Paddy, tomatoes and chillies are grown by transplantation.

Explanation:
The process of transferring the seedlings from the nursery to the main field by hand is called transplanting or transplantation. Some crops like paddy and many vegetables like tomatoes and chillies, the seeds are not directly sown in the field’s soil.

Explanation:
Nitrogen, phosphorus and potassium are chemical which can be provided to the soil by chemical substance called fertilizers whereas humus cannot. It is provided to the soil by natural substance called manure.

The crops which are sown in the rainy season are called kharif crops. The rainy season in India is generally from June to September. Example: paddy, maize.