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CBSE Questions for Class 8 Biology Crop Production And Management Quiz 6 - MCQExams.com
CBSE
Class 8 Biology
Crop Production And Management
Quiz 6
Which of the following is not a rabi crop?
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Wheat
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Mustard
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Sugarcane
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Peas
Explanation
Sugarcane is not a Rabi crop. It is a Kharif crop. Kharif crops are grown in rainy season.
Hence, the correct answer is option C.
Name the machine that is used for both harvesting and threshing?
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Combine
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Khurpi
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Seed drill
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Both A and B
The purpose of tillage is/are
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Breaking of soil clods and suppressing in soil
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Eradication of weeds
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Leveling of soil
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All of the above
Explanation
Tillage is the agricultural preparation of soil by mechanical agitation of various types, such as digging, stirring, and overturning. The purpose of tillage is multi-fold. Tillage serves to
(i) Reduce soil compaction from roads and/or heavy construction equipment,
(ii) Remove unwanted vegetation (weeds),
(iii) Prepare a seedbed,
(iv) Dilute surface contamination below an appropriate action level,
(v) Incorporate fertilizer, and
(v) Stabilize the soil by removing erosion features such as rills.
Weeds affect the crop plants by
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Killing the crop plants before they grow
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Secreting poisons which cause diseases in crop plants
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Competing for various resources of crop plants causing low availability of nutrients
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None of the above
Explanation
Weeds are unwanted plants in the cultivated field. They compete with the crop plants for food, space and light. They take up the nutrients and reduce the growth of the crop.
The common weedicide used in agricultural fields is:
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2,4-D
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2,4,5-T
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Indole acetic acid
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Abscissin
Explanation
Weedicides can be defined as the pesticides used to kill weeds.
2,4-D (2,4-dichlorophenoxyacetic acid) is a herbicide developed in the 1940s and is still in use today.
The low cost of 2,4-D has led to continued usage, and it remains one of the most commonly used herbicides in the world.
Hence, the correct answer is option A.
Identify the correct statements about manure.
(i) Manure contains large quantities of organic matter.
(ii) It increases the water-holding capacity of the soil.
(iii) Manure is produced synthetically.
(iv) Its excessive use pollutes the environment because it is made from animal wastes.
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(i) and (iii)
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(i) and (ii)
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(ii) and (iii)
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(iii) and (iv)
Explanation
Manure contains large quantities of organic matter and it is added to the soil to increase its fertility.
Manure increases the water-holding capacity of the soil.
This makes more water available to the plants.
M
anure is produced naturally by decomposing plant and animal wastes with the help of microorganisms.
It prevents environmental pollution because it recycles plant and animal wastes.
Therefore, option B is correct.
A few gram seeds were placed in each of the three pots A, B and C containing soil. The soil in Pot A is mixed some green twigs and leaves. The soil in pot B is mixed with old cow dung while soil of pot C is mixed with urea. Pots are watered regularly. Which of the following will be observed after 10 days?
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Lot of growth in A
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Not much growth in B
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Lot of growth in B but very little growth in C
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Very little growth in A but lot of growth in B and C
Explanation
Manure is an organic substance produced by the decomposition of plant and animal wastes in the presence of microorganism and used as fertilizers. Thus, the fresh manure contains decomposing bacteria along with active digestive enzymes. These enzymes contribute to the faster heating of the manure which accelerates the decomposition of organic materials by the soil microorganisms. The end result of better decomposition of organic material is faster nutrient release to the plant. When urea is placed on the surface of the soil, a chemical reaction takes place that changes the urea to ammonium bicarbonate. Urea should be mixed in with the soil for maximum effectiveness. For plants that love acidic soils, urea is one of the top fertilizers for acidifying soils. Hence, seeds will grow most in pots B and C.
Cultivation of kharif crops starts in ................. in the North Indian states.
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June
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September
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October
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July
Explanation
Kharif crops are usually sown with the beginning of the first rains towards the end of May in the Southern state of Kerala during the advent of South-West monsoon season. As the monsoon rains advance towards the North India, the sowing dates vary accordingly and reach in July in North Indian states.
Therefore, the correct answer is option D.
Tillage includes
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Ploughing of land
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Keeping the land free from weeds
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Making the soil levelled
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All of the above
Explanation
Tillage is a method of preparing land for growing the crops. It includes ploughing of land, keeps the land free from weeds, makes the soil leveled, and in preparation of the soil.
So the correct option is 'All of the above'.
In the harvested crop, the grain seed is separated from the chaff. This process is called as
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Threshing
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Seeding
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Ploughing
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Weeding
Explanation
Threshing is the process of separating the chaff from the grains with the help of blowing air. It is either done by hand or done with the help of a thresher.
The chaff from grains is separated from the straw with the help of a thresher.
So, the correct option is ' Threshing'.
An example of kharif crops grown in India is _____________.
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Soyabean
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Maize
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Groundnut
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All of the above
Explanation
The crops which are sown in the rainy season are called kharif crops. The rainy season in India is generally from June to September. Paddy, maize, soyabean, groundnut, and cotton are kharif crops.
Therefore, the correct answer is option D.
Choose the correct option with respect to the functions of a seed drill.
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Makes holes in the soil to drop seeds.
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Covers the sowed seeds with soil.
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Sows the seeds uniformly at proper distances.
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All of the above
Explanation
The seed drill is mainly used for sowing the seeds. The seed drill makes holes uniformly at proper distances in the soil and the seeds are dropped in these holes. A 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 D.
The process of cutting ripe or mature crops from the field is called as___________
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Irrigation
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Planting
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Harvesting
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None of these
Explanation
Harvest is the process of gathering ripe crops from the fields. Reaping is the cutting of grain or pulse for harvest, typically using a sickle or reaper.
The harvest marks the end of the growing season or the growing cycle for a particular crop, and social importance of this event makes it the focus of seasonal celebrations such as a harvest festival, found in many religions.
Therefore, the correct answer is option C.
Sowing is done with the help of_______________.
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Traditional tool
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Seed drill method
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Both A and B
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None of these
Explanation
The tools used for sowing seeds are as follows:
Traditional Tool- 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.
Seed Drill- 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 labour.
Therefore, the correct answer is option C.
The main function of cultivator is:
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To add water to the soil
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To make wholes in the soil
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To crush the soil
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All of the above
Explanation
Before sowing the seeds, it is necessary to
break the soil (ploughing) to the size of grains to get a better
yield. This can be done by the cultivator.
The
use of a cultivator saves labour and time.
Swing-basket (Dhekli) is used for___________
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Making furrow
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Lifting water from wells
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Destroying weeds
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Leveling of land
Explanation
Dhekli is a method where water is taken directly from the wells with the help of a pulley.
It is a manual method of irrigation. In the method, the farmers take a basket from the well and pour it into the pipes which lead to the fields.
So, the correct option is 'Lifting water from wells'.
The rearing of animals for specific purposes is called domestication and such animals are called domestic animals.
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True
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False
Explanation
The rearing of animals for specific purposes is called animal husbandry. This branch is concerned with animals that are raised for meat, eggs or other products.
So the statement is False.
Dhekli method of irrigation is not as popular as other methods of irrigation because
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It wastes lots of water
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It is a time consuming method
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It is not a cost effective
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All of the above
Explanation
Dhekli is a method where water is taken directly from the wells with the help of a pulley. It is a manual method of irrigation. The main disadvantage of this method is that it wastes a lot of water. It is less practised than other systems of irrigation.
So, the correct option is 'It wastes lots of water'.
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