ell reproduction.
WRITE ANSWER OF THESE QUESTION IN YOUR OLD SCIENCE NOTEBOOK.
1. Distinguish betsveen kharif and rabi crops, giving two examples of each.
2. List the steps involved in crop production, in sequential order.
3. Why is it important to plant seeds at the correct distances from each other?
4. Why do farmers normally use a mixture of manures and fertilizers in their fields?
5. What method of irrigation will you use if you live in a dry area with shortage of water?
Explain the method.
6. What is waterlogging? How does it harm the crops? How can it be prevented?
7. Discuss two methods of weeding in which poisonous chemicals are not used.
1. What are the advantages of ploughing the soil before sowing seeds?
2. What precautions must be kept in mind while sowing seeds in a field?
3. Discuss two natural methods of manuring.
Answers
Answer:
1 and 2 is provided
other ans are not there sorry gor that
Answer:
1. Rabi Crops:
Kharif CropsRabi CropsThese crops depend on the rainfall patterns.These crops are not affected by the rainfall.Major Kharif crops are rice, maize, cotton, jowar, bajra etc.Major Rabi crops are wheat, gram, peas, barley
2. Preparation of soil – Selection of seed and sowing.
Manuring – Irrigation – weeding.
Protection from pests and diseases.
Harvesting, threshing and winnowing.
Storage.
3.It is very important to sow seeds at the correct distance from each other because plants need some space to grow up and to stretch their branches and they will get sufficient amount of sunlight and nutrients and their will be no competition for food and nutrients
4. Answer: Farmers normally use a mixture of manure and fertilizers in their fields to increase the yield and production of crops. Manure is good for plants as it provides them with organic nutrients but it lacks some important nutrients like nitrogen, phosphorous and potassium
5. Drip irrigation thus helps in the optimization of water resources in water-scarce areas. The drip irrigation system has the potential to reduce irrigation water use by up to 70%, while increasing crop yields by 20 to 90%.
6. Water logging makes the soil like a bucket full of water or makes the soil full of water. Dueto this, the roots of the crops drown and become unable to breathe. We can prevent it by reducing the giving amounts of water to the crops.
7. The two methods of weeding in which chemicals are not used are: Manual method: Weeds are pulled out by hand or uprooted using a trowel or a harrow. Insect method: Insects that feed upon specific weeds are used
1. The advantages of polughing [loosening the soil ] before sowing seeds is important because of following reasons: --> The loosening and turning of soil during ploughing brings nutrient rich soil to top . --->The loose soil allows the plant to penetrate freely and deeper into soil.
2. Answer:The following precautions should be taken while sowing seeds: (i) Seeds should be grown at proper depth. (ii) They should be sown at a proper distance apart from each other. (iii) Seed used for sowing should be clean, healthy and free from any disease or infection.
3. Answer: Two natural methods of manuring are: Manures: Manures are organic substances obtained from dead plants and animal wastes. Green manure is made from crops grown specially to be ploughed into the soil while still green, i.e. legumes, rye grass, fenugreek, etc., to improve the fertility of the soil's
hope this will help you