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CBSE Questions for Class 8 Biology Crop Production And Management Quiz 2 - MCQExams.com
CBSE
Class 8 Biology
Crop Production And Management
Quiz 2
W
hich of the following crops cannot be grown between October and March?
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Paddy
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Maize
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Wheat
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Cotton
Explanation
Any crop that can be grown between October and March or during winter seasons are called rabi crops
such as wheat, cotton, maize, etc., as they do not require more water to grow.
Whereas crops that grow during the rainy season are called kharif crops such as paddy as they require more water to grow.
Thus, the correct answer is option A.
Identify the branch of biology based on the information given in the box.
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Biosphere reserve
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Animal husbandry
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Sanctuary
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National park
Explanation
Animal husbandry is defined as the agricultural practice of breeding and raising livestock by providing them with food and shelter. It also includes caring for these animals. Poultry such as chicken, duck, quails, etc are reared for eggs and meat. Animals such as cows and buffaloes are reared for milk. Goats are reared for milk and meat and sheep are reared for meat and wool. Thus the correct answer is option B.
Which of the following methods of cultivation makes soil fertile?
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Excessive use of chemical fertilizers
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Extensive cultivation
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Crop rotation
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Monocropping
Explanation
Crop rotation is the practice of growing of different types of crops in alternate season. The cash crops grown in one season is replaced by leguminous plants in the other season. The nutrients which are used up by the previous crops are regained by the second crops. So, crop rotation maintains soil fertility and prevents soil erosion.
So, the correct answer is option C.
Which of the following agricultural implements is used to separate grain seeds from the chaff?
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Plough
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Hoe
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Sickle
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Combine
Explanation
A combine is a machine that is used to harvest a variety of grain crops. The same machine is used for three processes as a single process - reaping, threshing and winnowing. Reaping is cutting of crops.
Threshing is the process of separating the grain from the stalk. Winnowing is the process of separating the chaff from the grain.
So, the correct answer is option D.
Which of the following processes helps to remove the chaff from the grains?
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Weeding
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Threshing
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Harvesting
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Winnowing
In _________ system of irrigation, water is delivered at or near the roots of the plant drop by drop.
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drip irrigation
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surface irrigation
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manual irrigation
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sprinkler irrigation
.......... is the first step to be followed before growing a crop.
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Preparation of soil
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Harvesting
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Weeding
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Adding manures and fertilizers
Explanation
Preparation of the soil is the first step before the growing of the crop. It helps to turn the soil and loosen it to allow the roots to penetrate deep into it. The loosening of the soil helps in the growth of several soil microbes, earthworms, etc. which enrich the soil with humus and other essential nutrients.
Thus, the correct answer is option A.
A high concentration of synthetic auxins is generally used for
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Weed control
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Enhancing root initiation
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Controlling of cell enlargement
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Preventing the growth of the lateral buds.
_________ are like artificial rainmakers.
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Sprinklers
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Cloud seeding
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Drought-Ridden
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Ice-nuclei seeding
Fertility of soil is increased by
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Nitrogen-fixing bacteria
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Denitrifying bacteria
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Methanogens
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All of the above
Explanation
Free living and symbiotic nitrogen fixing bacteria fix atmospheric inert nitrogen into biologically useful ammonia, thereby adding nitrogen to soil and increasing its fertility.
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Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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Assertion is correct but Reason is incorrect
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Assertion is incorrect but Reason is correct
Explanation
Leguminous plants have nodules in their roots. These nodules harbour
Rhizobium
bacteria, which convert atmospheric nitrogen into plant usable form. This process is called as nitrogen fixation. Thus, planting legume crops between two successive cereal crops improves soil fertility by increasing the nitrogen content of soil. Thus, the correct answer is option A.
The highest cultivated crop in India is:
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Wheat
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Maize
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Rice
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Banana
Explanation
Rice is a tropical plant that requires high temperatures and high rainfall.
Rice plants need
20 -
22 degrees Celsius
of temperature during the sowing season,
23 -
25 degrees celsius
during the growing season, and
25 - 30 degrees celsius
during the harvesting.
Such a range of temperature is available in India and that makes rice the most cultivated crop in India.
India has the largest paddy output in the world and is also the second-largest exporter of rice in the world.
Paddy fields are a common sight throughout India, be it northern Gangetic plains or southern peninsular plateaus.
Thus, the correct answer is option C.
Name two chemical fertilizers?
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Urea, ammonium sulphate
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Manure, humus
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Green manure, urea
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Urea, humus
The last step in crop production is
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Soil preparation
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Crop harvesting
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Irrigation
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Sowing
Explanation
A. Soil preparation - preparing the soil for cultivation
B. Crop harvesting - removal of crop plants
C. Irrigation - supply of water
D. Sowing - placing of seeds in the soil for cultivation.
So, the correct option is 'Crop harvesting'.
What are the yield products of the dairy industry?
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Milk
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Petrol
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wine
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Iron
The process of putting seeds in the soil for germination is known as:
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Sowing
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Manuring
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Weeding
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Tilling
Explanation
A.
Sowing involves putting seeds into the soil to make them germinate and grow.
B. Manuring includes adding manure to the soil before sowing seeds.
C. Weeding is the process of removing unwanted weeds from the field.
D. Tilling refers to ploughing of the soil before sowing seeds.
So, the correct option is option A.
Name the process in which grains are separated from chaff and hay with the help of wind.
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Winnowing
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Milling
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Processing
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Harvesting
Threshing is the process of:
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Separating chaff from the grain
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Cutting of mature crop
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Sowing seeds by hands
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Turning and loosening of soil
Explanation
Threshing is the process of separating the grain seeds from pods or chaff.
This step is done after harvesting the crops.
For this purpose, a machine called combine is used.
The process of cutting mature crops is known as harvesting.
P
loughing
is the process of turning and loosening the soil.
So, the correct answer is option A.
.......... is a process to loosen soil.
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Tilling
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Wilting
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Manuring
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Drilling
Animal husbandry is the scientific management of _____.
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animals livestock
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endangered species
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diary animals
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agriculture
Explanation
Animal husbandry is the scientific management of animal livestock.
It includes feeding, breeding, and disease control.
There are two types of animals in Animal husbandry:
Milch or milk yielding
Meat or egg yielding
So, the correct answer is option A.
Which of the following is an example of Kharif crop?
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Rice
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Wheat
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Gram
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Mustard
Explanation
Kharif crops are the crops which are cultivated from the month of June to October. These include crops like Rice, Bajra, Soyabean, Maize, Tur, Urad, Cotton and Sugarcane. Therefore the correct answer is 'Rice'.
Define irrigation.
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Irrigation is watering the land to make it ready for harvesting.
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Irrigation is digging the land to make it ready for agriculture.
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Irrigation is watering the land to make it ready for agriculture.
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Irrigation is providing water for home needs.
Explanation
Irrigation is the application of controlled amounts of water to fields at specific intervals. It is the watering of land to make it ready for agriculture. Irrigation systems are often complex combinations of canals, channels, and hoses. Irrigation helps to grow agricultural crops,
landscapes
, and revegetate
disturbed soils in dry areas and during periods of low rainfall.
So, the correct answer is 'C'.
.......... is the artificial application of water to the land or soil:
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Ploughing
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Irrigation
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Rainwater farming
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Tilling
Explanation
Irrigation is a system or process of supplying water to the fields where the crops are being grown. It was started due to the deficiency of rainfalls. Irrigation also makes the soil more fertile and nourishes the crop. It is an artificial method of supplying water into the fields.
So, the correct option is 'Irrigation'.
Crops which are grown in rainy seasons are
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Kharif crops
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Rabi crops
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Seasonal crops
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Annual crops
Explanation
The crops that are sown in the rainy season are called Kharif crops (also known as the summer or monsoon crop) in India.
Kharif crops are usually sown with the beginning of the first rains in July, during the southwest monsoon season.
The main monsoon season in India runs from June to September.
The Kharif crops include rice, maize, sorghum, pearl millet/bajra, finger millet/ragi (cereals), arhar (pulses), soybean, groundnut (oilseeds), cotton, etc.
The crops grown in winter from November to April are known as the rabi crops
So the correct answer is option A..
In a classroom discussion, three students made the following statements.
Shikha:
Fertilizers are chemical substances that are rich in a particular nutrient.
Ritesh:
Fertilizers increase the water holding capacity of the soil.
Abhishek:
Fertilizers used in excess provide lots of humus to the soil.
Which student(s) made incorrect statement(s)?
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Shikha and Ritesh
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Ritesh and Abhishek
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Abhishek and Shikha
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Shikha only
Explanation
Fertilizers are chemically synthesized substances that are rich in plant nutrients such as NPK.
They are artificially made but have a rapid response. It is added to soil or applied to plant tissues to supply one or more plant nutrients essential for the growth of plants. So, the statement given by Shikha is correct.
Fertilizers have a low capacity for holding water and nutrients. So, the statement given by Ritesh is incorrect.
The excessive use of fertilizers causes damage to the plants and can also harm the soil. So, the statement given by Abhishek is incorrect.
Thus, the correct answer is option B.
Which among the following tools saves labour and time?
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Hoe
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Cultivator
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Plough
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All of the above
Explanation
A cultivator is a type of farm implement used for secondary tillage. Nowadays, plowing is done by tractor driven cultivator which saves labor and time.
Therefore, the correct answer is option B.
The word 'Rabi' in Arabic means __________.
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Autumn
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Summer
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Spring
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Rain
Explanation
The crops grown in the winter season from October to March are called rabi crops. The word 'Rabi' in Arabic means spring. It is the springtime when the crops mature and are harvested. Some of the important rabi crops are wheat, barley, peas, gram, and mustard.
Therefore, the correct answer is option C.
Name the tool used for scraping the soil.
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Hoe
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Plough
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Cultivator
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Both A and B
Explanation
(A) Hoe- It is a tool that is used for digging and weeding. It is also used to break up the surface of the ground.
(B) Plough- It is used by the farmers for cultivation of the soil, and for sowing seed and making furrows.
(C) Cultivator- It is used to prepare a proper seedbed for the crop to be buried in. It is not used for scraping the soil.
So, the correct option is D.
Winnowing is_________.
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Cutting a crop
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To separate straw from threshed lank
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To thresh
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Cutting the fodder
Explanation
Cutting the crop is the first operation in the harvesting process.
Separation of grain from chaff by blowing a current of air through the grain is called winnowing.
The process of detaching the grains from the ear head, cob, or pod is called threshing.
It is basically the removal of grains from the plant by striking, treading, or rupturing.
Thus, the correct answer is option B.
Separation of good seeds from bad seeds can be done by__________
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Boiling in water
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Sieving
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Winnowing
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Immersing in water
Explanation
By immersing seeds in water, damaged seeds become hollow and are thus lighter.
Hence, they float in water. Whereas the good seeds are heavier and they settle down at the bottom.
Therefore, the correct answer is option D.
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