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Arrange these statements in correct sequence of preparation of green manure. (a) Green plants are decomposed in soil. (b) Green plants are cultivated for preparing manure or crop plant parts are used. (c) Plants are ploughed and mixed into the soil. (d) After decomposition it becomes green manure.

Soln: Green plants are cultivated for preparing manure or crop plant parts are Plants are ploughed and mixed into the (a) Green plants are decomposed in soil. After decomposition it becomes green

ScienceClass 9CBSE

Differentiate between compost and vermicompost?

Soln: Compost is formed by using farm waste materials like livestock excreta, vegetable waste, domestic waste, straw, discarded weeds. These all are decomposed and are used as manure for the farms. Vermicompost is s compost prepared by using organic matter. Here composting is done by using earthworms.

ScienceClass 9CBSE

Define the term hybridization and photoperiod

Soln: Hybridization- Crossing between genetically different organisms to produce desired characteristics in the offspring is known as hybridization. Duration of the sunlight available for a plant is called as photoperiod. Photoperiod is responsible for the growth of the plant.

ScienceClass 9CBSE

Fill in the blanks (a) A total of——nutrients are essential to plants. (b) ———and———are supplied by air to plants. (c) ———is supplied by water to plants. (d) Soil supply———nutrients to plants. (e) ———nutrients are required in large quantity and called as———. (f) ——— nutrients are needed in small quantity for plants and are called ———.

A total of 16 nutrients are essential to Carbon-di-oxide and Oxygen are supplied by air to Hydrogen is supplied by water to Soil supply 13 nutrients to 6 nutrients are required in large quantity and called as 7 nutrients are needed in small quantity for plants and are called micronutrients.

ScienceClass 9CBSE

Cultivation practices and crop yield are related to environmental condition. Explain

Different crops need different climatic conditions for the growth such as temperature, photoperiod and water. Some of the crops grown in rainy season which are called Kharif and some grow in winter which are called Rabi crops.

ScienceClass 9CBSE

Fill in the blanks (a) Photoperiod affect the————. (b) Kharif crops are cultivated from————to————. (c) Rabi crops are cultivated from————to————. (d) Paddy, maize, green gram and black gram are————crops. (e) Wheat, gram, pea, mustard are————crops.

Soln: Photoperiod affect the Flowering process Kharif crops are cultivated from June to October. Rabi crops are cultivated from Novemeber to Paddy, maize, green gram and black gram are Kharif Wheat, gram, pea, mustard are Rabi

ScienceClass 9CBSE

Group the following and tabulate them as energy yielding, protein yielding, oil yielding and fodder crop. Wheat, rice, berseem, maize, gram, oat, pigeon gram, sudan grass, lentil, soyabean, groundnut, castor and mustard.

Soln: Energy Yielding crop- Wheat rice Maize Protein Yielding crop- gram, pigeon gram, lentil, soyabean Oil yielding crop- groundnut, castor, mustard, soyabean Fodder crop-barseem, oat, sudan grass

ScienceClass 9CBSE

If there is low rainfall in a village throughout the year, what measures will you suggest to the farmers for better cropping?

Farmers are suggested to grow drought resistant crops which can mature early. Along with this farmers are advised to use manure for their field as it increases the water holding capacity of thesoil.

ScienceClass 9CBSE

Match the following A and B (A) (B) (a) Cattle used for tilling and carting (i) Milk producing female (b) Indian breed of chicken (ii) Broiler (c) Sahiwal, Red Sindhi (iii) Drought animals (d) Milch (iv) Local breed of cattle (e) Chicken better fed for obtaining (v) Aseel

(A) (B) Cattle used for tilling and carting (iii) Drought animals Indian breed of chicken (v) Aseel Sahiwal, Red Sindhi (iv) Local breed of cattle Milch (i) Milk producing female Chicken better fed for obtaining (ii) Broiler

ScienceClass 9CBSE

Give one word for the following (a) Farming without the use of chemicals as fertilizers, herbicides and pesticides is known as ———. (b) Growing of wheat and groundnut on the same field is called as ———. (c) Planting soyabean and maize in alternate rows in the same field is called as ———. (d) Growing different crops on a piece of land in pre-planned succession is known as———. (e) Xanthium and Parthenium are commonly known as———. (f) Causal organism of any disease is called as ———.

Farming without the use of chemicals as fertilizers, herbicides and pesticides is known as organic Growing of wheat and groundnut on the same field is called as mixed cropping. Planting soyabean and maize in alternate rows in the same field is called as inter cropping. Growing different crops on a piece of land in pre-planned succession is known as crop rotation. Xanthium and Parthenium are commonly known as weeds. Causal organism of any disease is called as pathogen.

ScienceClass 9CBSE

Why is excess use of fertilizers detrimental for environment?

Excess use of fertilizers is detrimental for environment because residue of fertilizers causes pollution in air, water and soil which proves costly.

ScienceClass 9CBSE

Why is organic matter important for crop production?

Soln: Organic matter is very important for crop production because of the following reasons Organic matter provides necessary minerals for the crops Organic matter loosen the soil structure to provide necessary aeration for the Organic matter improves water holding capacity of the Organic matter helps in drainage and to avoid water logging in clayey

ScienceClass 9CBSE

List out some useful traits in improved crop?

Below are the useful traits in improved crop. High yield of crop Improved crop quality Pest and weed resistance Wider adaptability Expression of desired agronomic

ScienceClass 9CBSE

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

A GM crop is the one which is developed by introducing a new gene from different source. Crops are genetically modified to obtain desired character. Example: BT cotton which has insect resistant gene from bacteria is grown in India.

ScienceClass 9CBSE

Fill in the blanks (a) Pigeon pea is a good source of ———. (b) Berseem is an important———crop. (c) The crops which are grown in rainy season are called———crops. (d) ———are rich in vitamins. (e) ——— crop grows in winter season.

Soln: Pigeon pea is a good source of Protein. Berseem is an important fodder The crops which are grown in rainy season are called Kharif Vegetables are rich in Rabi crop grows in winter

ScienceClass 9CBSE

Match the column A with the column B (A) (B) (a) Catla (i) Bottom feeders (b) Rohu (ii) Surface feeders (c) Mrigal (iii) Middle-zone feeders (d) Fish farming (iv) Culture fishery

Catla (ii) Surface feeders Rohu (iii) Middle-zone feeders Mrigal (i) Bottom feeders Fish farming (iv) Culture fishery

ScienceClass 9CBSE

Preventive and control measures adopted for the storage of grains include (a) strict cleaning (b) proper disjoining (c) fumigation all of the above

Soln: Answer is (d) all of the above

ScienceClass 9CBSE

Which one of the following nutrients is not available in fertilizers? (a) Nitrogen (b) Phosphorus (c) Iron Potassium

Soln: Answer is (c) Iron Explanation: Plants obtain iron from nutrients in the soil. There is no fertilizer that can prove iron for the plants.

ScienceClass 9CBSE

Animal husbandry is the scientific management of (i) animal breeding (ii) culture of animals (iii) animal livestock (iv) rearing of animals (a) (i), (ii) and (iii) (b) (ii), (iii) and (iv) (c) (i), (ii) and (iv) (i), (iii) and (iv)

Soln: Answer is (d) (i), (iii) and (iv)

ScienceClass 9CBSE

Which one of the following fishes is a surface feeder? (a) Rohus (b) Mrigals (c) Common carps Catlas

Soln: Answer is (d) Catlas

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