Crop Production And Management Book Back Questions 8th Science Lesson 21
8th Science Lesson 21
21] Crop Production And Management
Book Back Questions with Answer and Do You Know Box Content
Do You Know?
Our country is the largest producer of bananas and mangoes in the world. It is also the second largest producer of wheat and rice.
Transplanting is removal of an actively growing seedling from one place (usually nursery bed) and planting it in the main field for further growth till harvest. Transplanting makes use of pre-grown plants, seedlings or vegetative propagated clones.
The global population is expected to be 9 billion by the year 2050. But, agriculture activities alone utilize 70% of the available fresh water resources. So, efficient and sustainable water use is needed for our own generation and future generations. Drip irrigation is a better solution for economical use of water.
There are over 30000 species of weeds around the world. Out of these 18000 species cause serious losses to crops. The continuous use of the same method leads to building up of tolerant species. Therefore, a suitable combination of different methods of weed control should be practiced.
Food Corporation of India (FCI) was set up on 14th January 1965 at Chennai with the objective of distribution of food grains throughout the country for Public Distribution System (PDS) and maintaining a satisfactory level of operational and buffer stocks of food grains to ensure national food security. Its capital is in New Delhi now.
Leguminous plants have symbiotic relation with the Rhizobium bacteria found in the root nodules of these plants. These plants have the ability to fix atmospheric nitrogen in their roots with the help of these bacteria. The fruits of this plant are called legumes. Examples of legumes include alfalfa, clover, peas, beans, lentils, lupins, mesquite, carob, soy and peanuts. These plants are used in crop rotation to multiply soil nitrogen.
Acharya Jagadish Chandra Bose Indian Botanic Garden located in Kilkatta was earlier called Royal Botanic Garden. This garden exhibits a wide variety of rare plants and a total collection of over 12,000 specimens. The area of this garden spreads over 109 hectares.
Plant shows quick response to the nutrients applied by foliar feedings. The efficiency of nutrients uptake is considered to be higher when nutrients are applied to the leaves, when compared with nutrients applied to soil. A foliar feeding is recommended when environmental conditions limit the uptake of nutrients by roots.
The black kneel capsid is an insect found on fruit trees. It eats more than 1000 fruit tree red spider mites per year.
Choose the best answers:
1. The process of placing seeds in the soil is called as
(a) Ploughing
(b) Sowing
(c) Crop production
(d) Crop rotation
2. Organism that control insects and pests of plant crops is
(a) Bio-pesticides
(b) Bio-fertilizers
(c) Earthworms
(d) Neem leaves
3. The method in which water flows over the soil surface and allow it to infiltrate is
(a) Irrigation
(b) Surface irrigation
(c) Sprinkler irrigation
(d) Drip irrigation
4. Effective microorganism preparation is not used in
(a) Seed treatment
(b) Foliar spray
(c) Soil treatment
(d) Bio-predators
5. Which of the following is not present in Panchagavya?
(a) Cow dung
(b) Cow’s urine
(c) Curd
(d) Sugar
Fill in the blanks:
1. The process of actively growing seedling from one place and planting in the main field for further growth is called _________.
2. ________ is a plant growing in a place where it is not wanted.
3. The chemicals used for killing the weeds or inhibiting their growth are called as ____________.
4. __________ seeds transfer their unique characteristics to the descents.
5. _____________ centres serve as the ultimate link between ICAR and farmers.
6. Several popular high yielding varieties of major crops have been developed by _________________.
Match the following:
1. Bio – pesticide – Neem leaves
2. Bio – predators – bacillus thuringiensis
3. Bio – fertilizer – Control white flies
4. Bio – Indicators – Improve soil fertility
5. Bio – repellants – Quality of environment
Answers:
Choose the best answers:
1. sowing 2. bio-pesticides 3. surface irrigation 4. seed treatment 5. Sugar
Fill in the blanks:
1. Transplantation 2. Weed 3. Herbicide 4. Heirloom seeds 5. Krishi Vigyon Kendra 6. IARI
Match the following:
1.Bio-pesticide- Bacillus thuringiensis
2.Bio-predators- Control white flies
3.Bio-fertilizer- Improve soil fertility
4.Bio-indicators- Quality of environment
5.Bio-repellants- Neem Leaves