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CBSE Questions for Class 8 Biology Crop Production And Management Quiz 3 - MCQExams.com
CBSE
Class 8 Biology
Crop Production And Management
Quiz 3
Kharif crops are grown in the month of _________________
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March- December
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June- September
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October- March
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Entire year
Explanation
Kharif crops or monsoon crops are domesticated plants cultivated and harvested during the rainy (monsoon) season. The rainy season in India is generally from June-September.
Therefore, the correct answer is option B.
Which of the following are Kharif crops?
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Paddy and maize
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Wheat and legumes
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Legumes and maize
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Maize and wheat
Explanation
The crops that are cultivated in the rainy season are called Kharif crops. The Kharif crops include rice or paddy, maize, cotton, etc.
Therefore, the correct answer is option A.
Rabi crops are harvested in _______.
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Spring
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Summer
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Winter
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Autumn
Explanation
The crops that are sown in winter and harvested in the spring season (March, April, May) are rabi crops.
For example, oats, pulses, mustard, linseed, etc are some rabi crops.
So, the correct option is 'Spring'.
Which of the following is the main kharif crop grown in India?
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Cotton
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Rice
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Soya bean
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Mung bean
Explanation
Kharif crops or monsoon crops are domesticated plants cultivated and harvested during the rainy (monsoon) season in South Asia, which lasts between June and September depending on the area. Main Kharif crops are millet and rice.
Thus, the correct answer is option B.
Which of the following is the main part of plough?
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Ploughshaft
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Ploughshare
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Beam
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None of these
................. does not cause any harm to the environment.
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Manure
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Pollutant
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Chemical fertilizer
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All of the above
Explanation
Manure is an organic substance obtained from the decomposition of plant or animal wastes. Farmers dump plant and animal waste in pits at open places and allow it to decompose. The decomposition is caused by some microorganisms. The decomposed matter is used as organic manure. As it is an organic product, it will not cause any harm to the environment. The pollutants and the chemical fertilizers are harmful for the environment.
Therefore, the correct answer is option A.
______ system of irrigation is more useful on uneven lands.
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Sprinkler system
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Rahat
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Drip system
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Dhekli
Explanation
A sprinkler system is more useful on uneven lands where sufficient water is not available. In this method, water is supplied using pipes to one or more central locations within the field. When water is allowed to flow under high pressure with the help of a pump, it gets sprinkled on the crops.
Therefore, the correct answer is option A.
The supply of water to crops at different intervals is____________
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Harvesting
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Winnowing
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Irrigation
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Sprinkling
Explanation
The supply of water to the crops at different intervals of ti,e is called as irrigation.
The time and frequency of irrigation vary from crop to crop, soil to soil and season to season. In the summer season, the frequency of watering is more due to the evaporation of water from the soil and leaves.
In the case of wheat, irrigation is required at intervals during different stages of plant growth. Rice crop requires standing water in the field.
Therefore, the correct answer is option C.
Which method of irrigation is cheaper but less efficient?
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Traditional method
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Modern method
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Both A and B
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Depends on the agricultural land
Explanation
The supply of water to the crops at different intervals is called irrigation. Lakes, rivers, dams, canals, etc. are the sources of water for irrigation.
The water from lakes or canals is lifted up by different methods. Human or cattle labor can be used for these methods.
Various traditional ways of irrigation are pulley system, chain pump, dhekli and Rahat.
Traditional methods are cheaper but, they are less efficient as compared to modern methods like a sprinkler system, drip system, etc.
Apart from soil fertility, manure also enhances .......... of the soil.
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Decomposition of microorganisms
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Roots holding capacity
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Soil binding capacity
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Water holding capacity
Explanation
Manure is an organic substance produced by the decomposition of plant and animal wastes in the presence of microorganisms and used as fertilizers. It
enhances the water holding capacity of the soil.
It also makes the soil porous which makes the
exchange
of gases easy.
Therefore, the correct answer is option D.
Which are the different traditional methods of irrigation?
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Chain pump
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Dhekli
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Rahat
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All of the above
Explanation
The supply of water to the crops at different intervals is called irrigation. Lakes, rivers, dams, canals, etc. are the sources of water for irrigation.
The water from lakes or canals is lifted up by different methods. Human or cattle labor can be used for these methods.
Various traditional ways of irrigation are pulley system, chain pump, dhekli, and Rahat.
Traditional methods are cheaper but they are less efficient as compared to modern methods like a sprinkler system, drip system, etc.
Seed drill is used for sowing with the help of ________________
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Tractors
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Wooden log
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Sprinkler
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None of these
Explanation
Nowadays the seed drill is used for sowing with the help of tractors. This tool sows the seeds uniformly at proper distances and depths.
It ensures that seeds get covered by the soil after sowing. This prevents damage caused by birds. Sowing by using a seed drill saves time and labor.
Therefore, the correct answer is option A.
Which among the following is the tool used for sowing seeds that is shaped like a funnel?
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Plough
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Hoe
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Traditional tool
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Seed drill
Explanation
The tool used traditionally for sowing seeds is shaped like a funnel. The seeds are filled into the funnel, passed down through two or three pipes having sharp ends.
These ends pierce into the soil and place seeds there.
Therefore, the correct answer is option C.
The decomposed matter is used as ___________.
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Thrown as waste
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Organic manure
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Inorganic manure
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Decomposer
Explanation
Manure is an organic substance produced by the decomposition of plant or animal wastes in the presence of microorganisms. It is used to increase the fertility of the soil.
Therefore, the correct answer is option B.
Which of the following statements are correct with respect to the advantages of seed drill?
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It avoids overcrowding that allows plants to get sufficient sunlight and nutrients.
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It ensures that seeds get covered by the soil after sowing which prevents damage caused by birds.
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Both A and B
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It helps in irrigation.
Explanation
The seed drill is mainly used for sowing the seeds. The seed drill makes holes at a proper distance in the soil and the seeds are dropped in these holes. This helps in avoiding overcrowding between plants for sunlight and nutrients. Seed drill ensures that seeds get covered by the soil after sowing.
This prevents birds from picking up the seeds.
So, the correct answer is option C.
Cultivators are driven by buffaloes.
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True
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False
Explanation
A cultivator is any of several types of farm implement used for secondary tillage. Cultivators are not driven using cattles they are machines which do not need animals to make them work.
Therefore, the correct answer is option B.
Which system is a boon in regions of poor availability of water?
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Sprinkler system
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Rahat
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Drip system
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Dhekli
Explanation
Drip irrigation is an irrigation method that saves water and nutrients by allowing water to drip slowly to the roots of plants.
The water is dripped slowly by a
network of valves, pipes, tubes, and emitters
either to the soil surface or directly to the root zone through the underground tube system. This minimizes the waste of water through evaporation.
Therefore, the correct answer is option C.
The growth of weeds can be controlled by
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Manual removal
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Irrigation
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Herbicides
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All of the above
Explanation
The growth of weeds can be controlled by the following methods:
(1) Coverings: In domestic gardens, methods of weed control include covering an area of ground with a material that creates a hostile environment for weed growth, known as a weed mat. Several layers of wet newspaper prevent light from reaching plants beneath, which kills them.
(2) Manual removal: Many gardeners still remove weeds by manually pulling them out of the ground, making sure to include the roots that would otherwise allow them to resprout.
(3) Irrigation: Drip irrigation involves bringing water directly to the roots of the desired plants, thereby limits weed's access to water.
(4) Biological pesticide: Vinegar kills the visible part of the weed. They will wrinkle and die the next day, although the root will still be in place to continue growing.
Therefore, the correct answer is option D.
................... method provides water directly to the roots without wastage.
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Sprinkler system
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Drip system
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Harvesting
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All of the above
Explanation
Drip irrigation, is an irrigation method that saves water and fertilizer by allowing water to drip slowly to the roots of plants, either onto the soil surface or directly onto the root zone, through a network of valves, pipes, tubing, and emitters.
Therefore, the correct answer is option B.
Winnowing makes use of .................... for separation.
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Sand
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Wind
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Water
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All of the above
Explanation
Winnowing is a method used to separate the grains from the chaff. It involves throwing the mixture into the air so that, the wind blows away the lighter chaff, while the heavier grains fall back down for recovery.
Techniques included using a winnowing fan (a shaped basket shaken to raise the chaff) or using a tool (a winnowing fork or shovel) on a pile of harvested grain.
Therefore, the correct answer is option B.
Small scale storage of grains is done in_______________________
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Silos
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Granaries
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Buckets
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Jute bags
Explanation
Storage of food crops is an important step of agricultural practices like
harvesting because if the grains are not stored properly it may get spoilt or attacked by insects or rats or microorganisms.
Large scale storage of grains is done in granaries or silo. On small scale f
armers store their dried grains in jute bags or metallic bins.
Therefore, the correct answer is option D.
Threshing is the _____________________
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Process of removal of bran
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Process of loosening of grain from chaff
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Process after winnowing
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None of these
Explanation
Threshing is the process of loosening the edible part of cereal grain (or another crop) from the scaly, inedible chaff that surrounds it.
It is the step in grain preparation after harvesting and before winnowing, which separates the loosened chaff from the grain.
Threshing does not remove the bran from the grain.
Therefore, the correct answer is option B.
Storage of food for longer duration should be prevented from_______________
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Humans
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Sand
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Rats
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Jute
Explanation
The storage of food crops is an important step of agricultural practices. If the crop grains are to be kept for a longer time, they should be prevented from moisture, insects, rats, and microorganisms.
Therefore, the correct answer is option C.
Cultivators make use of ................ for their working.
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Tractors
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Pulleys
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Generators
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None of these
Explanation
A cultivator is a type of farm implement used for secondary tillage.
Cultivators are usually either self-propelled or drawn as an attachment behind either a two-wheel tractor or four-wheel tractor.
Therefore, the correct answer is option A.
................. helps in weed control.
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Mono cropping
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Multi cropping
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Both A and B
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Crop rotation
Explanation
Rotating crops with ones that kill weeds by choking them out, such as hemp and other crops, can be a very effective method of weed control.
It is a way to avoid the use of herbicides and to gain the benefits of crop rotation.
Therefore, the correct answer is option D.
Choose the correct options from the following.
Advantage of manure is/are
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It is cheap.
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It reduces soil erosion.
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It increases soil fertility, water holding capacity and aeration.
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All of the above.
Explanation
Manure is an organic substance produced by the decomposition of plant and animal wastes in the presence of microorganism and used as fertilizers. Advantages of manure are that it is cheap, it reduce soil erosion, it increases soil fertility, water holding capacity and aeration.
Thus, the correct answer is option D.
'Moat', 'dhekli', and 'rahat' are different types of:
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Traditional methods of cultivation
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Traditional methods of seed sowing
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Traditional methods of weeding
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Traditional methods of irrigation
Explanation
Traditional methods of irrigation include chain pump, dhekli, moat, rahat. In these systems, the water available in wells,
lakes, and canals is lifted up with the help of cattle or human labor, for taking water to the field.
So, the correct option is D.
Growing different crops alternately on the same land is known as ____________.
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Crop alternation
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Crop rotation
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Crop change
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Multicropping
Nowadays, seeds are sown in the field using:
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Seed tractor
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Seed drill
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Seed tiller
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Seed plough
Explanation
A seed drill is a sowing device that positions seeds in the row and then covers them. The seed drill sows the seeds at equal distances and proper depth, ensuring that the seeds get covered with soil and are saved from being eaten by birds. It is an efficient method used to save time.
Thus, the correct answer is option B.
__________ contains large quantities of organic matter.
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Manure
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Sand
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Rock
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Water
Explanation
Manure is an organic substance produced by the decomposition of plant and animal wastes in the presence of microorganisms and is used to increase the fertility of the soil.
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