Solving the CBSE Class 8 Science Chapter 1 Crop Production and Management Objective Questions for practice helps the students to not only understand the concepts thoroughly but it will also help them to score good marks. By solving more of these Multiple Choice Questions (MCQs), students get further acquainted with the most effective way to answer these questions. This will help them to score more in the board exams, as the latest question papers are expected to include more objective questions.
Students can access the topic wise CBSE Class 8 Science Objective Questions of Chapter 1 from this article.
Sub-Topics Listed From Chapter 1
1.1 Agricultural Practices
1.2 Basic Practices of Crop Production
1.3 Preparation of Soil
1.5 Adding Manure and Fertilisers
1.7 Protection from Weeds
1.10 Food from Animals
Crop Production and Management
1. Organic wastes can be decomposed to form ________, which can sustainably enhance the nutrient content of the soil.
- cow dung
Answer: (A) compost
Solution: Composting is a process in which organic wastes are decomposed naturally to form a nutrient-rich compost. It is a natural and environment-friendly process, which forms a key feature in organic farming. Organic substances like animal faeces, leaves, grass clippings, vegetables, eggshells, etc. can also be composted and used in farms.
2. Select the method(s) of irrigation which can be employed in an uneven land.
(iii) Chain Pump
(iv) Drip System
- (ii) and (iv)
- Only (iv)
- (i), (ii) and (iii)
- (i) and (ii)
Answer: (A) (ii) and (iv)
Solution: Traditional methods of irrigation, such as moat and chain pump, are useful only in plains where the terrain aids the flow of water into the fields. However, both sprinkler and drip system of irrigation are very efficient even in an uneven land.
3. Which of the following is a rabi crop?
Answer: (B) Mustard
Solution: Crops which are grown during the rainy season are called kharif crops. Paddy (rice), millets and cotton are examples of kharif crops. On the other hand, crops grown during the winter season are called rabi crops. Rabi crops include wheat, gram, and mustard.
4. Which of the following should be used by a farmer with a large farm to harvest his crops quickly and efficiently?
- Winnowing machine
- Seed drill
Answer: (B) Combine
Solution: Cutting of the crop close to the ground after it is mature is called harvesting. Farmers with small farms harvest their crops manually using tools like a sickle. However, after harvesting, they need to manually undertake threshing and winnowing. Whereas, farmers with huge farms cannot deploy manual labour for harvesting and threshing as it is more time consuming. Instead, it is more efficient for them to use machines such as a combine. A combine performs the function of both harvester as well as thresher. This saves a lot of time and manual labour.
5. In today’s world, where water is a scarce resource, which among the following irrigation methods is most feasible and sustainable?
- Sprinkler system
- Drip system
- Tube well
- Chain pump
Answer: (B) Drip system
Solution: Drip irrigation is a technique in which water flows through a filter into special drip pipes. It helps in releasing water drop by drop into the soil near the roots of plants. In contrast to other types of irrigation systems such as overhead sprinklers, water can be more precisely applied to the plant roots. If designed, installed and managed properly, this method contributes greatly to water conservation by reducing evaporation.
6. Consider the following statements about weeding and identify the incorrect one.
- Weeding is best done during tilling itself.
- Weeding is the process of growing weed.
- Weeding is the process of removal of weeds.
- Weeding is usually done manually or by using weedicides.
Answer: (B) Weeding is the process of growing weed.
Solution: Weeding is the process of removal of weeds (unwanted plants) in an agricultural land. It is a process best done before planting and during tilling so that weeds do not mature and do not interfere with the harvesting process. Weeding can be done manually by using tools like khurpi or chemically done by using weedicides.
7. What are the important steps in the preparation of soil?
- Loosening and sowing
- Loosening and weeding
- Turning and sowing
- Turning and loosening
Answer: (D) Turning and loosening
Solution: Turning and loosening are the important steps in the preparation of soil because they help in the penetration of the root deep into the soil.
8. Which of the following is not a traditional irrigation method?
- Chain pump
- Lever system
- Drip system
Answer: (D) Drip system
Solution: Irrigation is the process in which water is supplied to plants at regular intervals, for agriculture. The traditional methods of irrigation include moat, chain pump, dhekli and rahat. Modern methods comprise the use of sprinklers and drip system of irrigation.
9. If you were a farmer, which of the following methods will you use to separate good quality and viable grains from a heap of grains after harvest?
- Checking the weight of grains.
- Checking grains under sunlight for pores.
- Immersing the grains in water.
- Sowing seeds and waiting for germination.
Answer: (C) Immersing the grains in water.
Solution: The most appropriate and simple method of separating good quality grains from the damaged ones is by immersing all the grains in water. Doing this will cause damaged or bad grains to float up because they are hollow. The viable or good seeds, on the other hand, will sink and settle at the bottom.
10. Which of the following is used to preserve food grains at home?
- Spinach leaves
- Curry leaves
- Neem leaves
- Tulsi leaves
Answer: (C) Neem leaves
Solution: Dried neem leaves are used to preserve food grains at home to protect them from pests and microorganisms. Extracts of neem leaves and neem fruits repel more than 200 species of mites, worms and insects and hence is a convenient resource to protect grains at home.
11. Weeds are controlled by chemicals called _________.
Answer: (C) Weedicides
Solution: Weeds are controlled using chemicals called weedicides. A common example is 2,4-Dichlorophenoxyacetic acid (2,4-D). They affect only the weeds but have no effect on crops. They are diluted with water and sprayed on the fields with a sprayer.
12. Which type of irrigation is similar to rainfall?
- Sprinkler system
- Drip system
Answer: (B) Sprinkler system
Solution: Sprinkler system is a type of irrigation mostly used on uneven land where sufficient water is not available. The perpendicular pipes, having rotating nozzles on top, are connected to the main pipeline at regular intervals. When water is allowed to flow through the main pipe under pressure with the help of a pump, it escapes from a rotating nozzle. It gets sprinkled on the crop as if it is raining.
13. What are the advantages of preparing the soil?
- All of these.
- Makes decomposition by microbes easier.
- Makes the top soil nutrient rich.
- Allows roots to penetrate the soil easily.
Answer: (A) All of these.
Solution: Turning and loosening soil are two most important steps in soil preparation. The process of turning brings deep layer of soil that is rich in nutrients to topmost layer or topsoil. Loosening of soil allows roots to easily penetrate the soil and also helps in growth of earthworms and microbes that in turn help in the formation of humus.
14. Arrange the following agricultural practices in the order in which they are followed.
- Preparation of soil
Answer: (B) 5→2→4→1→3
Solution: In basic agricultural practice, the first step is to prepare the soil for crop. This step includes tilling or ploughing. Once the soil is well prepared, sowing is done. After sowing, continuous water supply for crop growth is provided by irrigation. When the crops are ripe, they are harvested and the grains obtained are stored for further use.
15. The process of loosening and turning the soil is known as:
Answer: (B) Ploughing
Solution: Ploughing is the process of loosening or turning the soil. It is done mainly using a plough, hoe or a cultivator. Ploughing allows easy penetration of roots into the soil and provides air spaces for roots and microbes to breathe.
16. The process of drying wheat stalks in the sun and then beating them to separate the grains is called
Answer: (B) Threshing
Solution: Threshing is done by drying the stalks in the field and then beating them to separate grains. The process of beating the stalks can be done by bullocks or machines. This can also be carried out with the help of a machine called ‘combine’ which is, in fact, a combination of harvester and thresher.
17. Which of the following tool helps in uniform distribution of seeds while sowing?
- Seed drill
- Funnel connected to pipes
Answer: (B) Seed drill
Solution: Seed drill is a sowing device that precisely positions seeds in the soil at proper depth and then covers them. It also maintains uniform distance between the seeds.
18. Which of the following animal is taken care of in animal husbandry?
Answer: (C) Buffalo
Solution: Buffalo is a domesticated animal which is raised for farm purposes. It provides milk and also helps in carrying out various steps of agricultural work.
19. Identify the agricultural method in which different crops are grown on a piece of land season after season.
- Crop rotation
- Shifting cultivation
Answer: (C) Crop rotation
Solution: Crop rotation is a method in which farmers cultivate different types of crops in a piece of land, season after season. This method helps in reducing soil erosion and increases soil fertility and crop yield.
20. Rhizobium bacteria in the root nodules of leguminous plants help in fixing:
Answer: (C) Nitrogen
Solution: Rhizobium bacteria in the root nodules of leguminous plants help in fixing nitrogen. Nitrogen has to be ‘fixed’ because plants cannot take up nitrogen directly from the atmosphere.