Question: Name any two fodder crops.
Answer: Berseem, oats or Sudan grass are raised as food for the livestock, called fodder crops.
Question: What do you understand by photoperiod of sunlight?
Answer: Photoperiod are related to the duration of sunlight required for plant growth.
Question: Name two kharif crops.
Answer: Paddy and soyabean.
Question: Name two rabi crops.
Answer: Wheat and gram.
Question: Define hybridisation.
Answer: Hybridisation refers to crossing between genetically dissimilar plants, to obtain, better variety of crops.
Question: What are genetically modified crops?
Answer: By introducing a gene with required characters into a crop for its improvement is called genetically modified crop.
Question: “Shorter the duration of the crop from sowing to harvesting, the more economical is the variety”. Give reason for this.
Answer: Due to short duration of crop growth, farmers can grow more crops in a year, and reduce the cost of drop production.
Question: Name different types of crop production practices involved in India.
Answer: They are (a) no cost production, (b) low cost production and (c) high cost production.
Question: Who provides nutrients to plants?
Answer: Nutrients to plants are provided by air, water and soil.
Question: What are macro-nutrients?
Answer: The nutrients required by plants in larger quantity is called macro-nutrients. They are nitrogen, phosphorus, potassium, calcium, magnesium and sulphur.
Question: Name the nutrients that plant obtain from air and water.
Answer: Air – Carbon and oxygen Water- Hydrogen and oxygen
Question: State the difference between compost and vermi-compost.
Answer: The compost is obtained by decomposition of organic waste like animal excreta, plant waste etc. naturally due to decomposition by bacteria.
Vermi-compost: To hasten the process of decomposition redworms are added to this organic matter to obtain compost.
Question: Name any two weeds.
Answer: Parthenium and Xanthium.
Question: What causes disease in plants?
Answer: It is caused by pathogens such as bacteria, fungi and viruses.
Question: Name two Indian cattle.
Answer: Bos indicus – cows 4 Bos bubalis – buffaloes
Question: Name two exotic breeds of cattle.
Answer: Jersey and Brown Swiss