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CBSE Questions for Class 9 Biology Improvement In Food Resources Quiz 3 - MCQExams.com
CBSE
Class 9 Biology
Improvement In Food Resources
Quiz 3
Irrigation is necessary for areas receiving rainfall _____.
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Less than 200 cm
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Less than 75 cm
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Less than 125 cm.
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Between 75 cm to 125 cm
Explanation
Irrigation is the method by which water is collected, stored and supplied controllably when required by artificial means. Irrigation is necessary for areas receiving rainfall less than 75 cm like that in the states of Rajasthan.
Option B is correct.
Which of the following is a food-fodder mixed farming system?
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Growing food crops alone
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Growing fodder crops alone
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Growing crops which can be used as food and fodder by using more fertilizers.
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Growing food crops and fodder crops in the same field.
Explanation
Growing food crops and fodder crops together in a field is a food-fodder mixed farming system. In this agricultural system, a farmer grows crops like rice, wheat or cash crops together with fodder crops like sorghum, oat, etc. to increase the income through different sources.
So, the correct answer is option D.
Which of the following characteristic can be obtained when quality breeding is done?
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Higher yields of crop in a shorter period of time
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Cropping without irrigation
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Increased lifespan of crops by 10 years
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Carrying out photosynthesis at night
Explanation
Varieties or strains of improved crops can be selected by quality breeding for various useful characteristics such as disease resistance, response to fertilisers, product quality and high yields.
So, the correct answer is option A.
The trait which is accounted for hybridization is
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Resistance to diseases
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Productivity
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Tolerance to climatic condition
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All of the above
Explanation
The crossing between two plants of different species to produce a new variety is called hybridization.
The new plant which is produced is known as the hybrid which possesses superior characters of both the parent plants.
The traits which are considered for hybridization are resistance to pests, insects and diseases, an increase in productivity and high yielding, tolerance to adverse conditions, etc.
Thus, the correct answer is option D.
Which of the following states has the highest percentage of irrigated land?
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Haryana
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Punjab
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Rajasthan
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Himachal Pradesh
Explanation
Punjab leads the country's States and UT s in terms of land under irrigation, with 98.8 per cent of its crop land under irrigation. Other major states where irrigation is done by canals are Madhya Pradesh, Andhra Pradesh, Haryana, Punjab and Bihar.
The correct answer is B.
Manures and fertilizers are used to ensure
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High productivity
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High fertility
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Crop variety
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Both A and B
Explanation
Manure is a natural product which is obtained from by decaying of animal waste. The fertiliser is an organic matter that is added up to the soil. Both manure and fertilisers help to increase the soil fertility, increase the nutrients in the soil as manure are rich in minerals and both help in increase of crop production.
So, the correct option is 'Both A and B'.
The technique of combining of desirable characteristics in one plant and then multiplying such individual to the extent that it is easily available for common use of farmers is know as crop improvement.
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True
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False
Explanation
$$\textbf{Correct answer:True}$$
$$\textbf{Solution:}$$
$$\bullet$$Crop improvement or plant breeding is the process of changing a plant's genetic pattern to boost its value and utility for human welfare.
$$\bullet$$It is the deliberate modification of plants to produce desirable plant kinds that are more suitable for cultivation, yield more, and are disease resistant. It is completely reliant on domestication.
Crop rotation is used by farmers to increase:
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Nitrogen content of the soil
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Organic content of soil
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Community area
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Soil fertility
Explanation
Crop rotation is the practice of growing different crops in succession on a piece of land to avoid depletion of a particular type of nutrient from the soil and to regain its fertility. It also helps in controlling weeds, pests, and diseases.
So, the correct answer is option D.
Crop rotation results in:
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Increase in soil fertility
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Decrease in crop yield
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Increased water loss
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Decrease in soil fertility
Explanation
Crop rotation is the process of growing a series of different crops in the same area in sequenced seasons.
Crop rotation helps in increasing soil fertility. For example,
growing legumes as fodder in one season
and wheat in the next season can help
in the replenishment of the soil
with nitrogen. It also helps in reducing soil erosion and increasing crop yield.
Thus, the correct answer is option A.
Crop rotation is employed for
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Increasing nitrogen content of soil
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Checking soil erosion
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Community development
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Enhancing soil fertility
Explanation
Crop rotation is the practice of growing a series of dissimilar or different types of crops in the same area in during different seasons. It is done so that the soil is not depleted of a particular type of nutrients. It helps in reducing soil erosion and increases soil fertility and crop yield.
So, the correct answer is 'Enhancing soil fertility'
Cowdung is appropriately used as.
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Manure
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Fuel
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Medicine
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Building material
Explanation
Cattle manure is basically made up of digested grass and grain. Cow dung is high in organic materials and rich in nutrients. It contains about 3 % Nitrogen, 2% Phosphorus, and 1 % Potassium . Hence, acts as a perfect fertiliser
So, the correct answer is 'Manure'
Which of the following is associated with egg production?
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White revolution
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Yellow revolution
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Silver revolution
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Green revolution
The growing of different crops on a piece of land in pre-planned
succession is called:
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Shifting agriculture
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Crop rotation
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Contour farming
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Strip farming
Explanation
Crop rotation is the practice of planting different crops sequentially on the same plot of land to improve soil health, optimize nutrients in the soil, and combat pest and weed pressure. For example, say a farmer has planted a field of corn.
So, the correct option is B.
The major activities for improving crop yields can include:
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Crop variety improvement
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Crop production improvement
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Crop protection management
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All of these
Explanation
Option A- Depends on finding a crop variety that can give a good yield. Variety can be selected by breeding for various useful desirable characters.
Option B- Crop production improvement depends upon many factors such as:
(i) Understanding how crops grow and develop.
(ii) Effect of various nutrients, climate, and water on the growth of the plant.
(iii) Modification and management of each factor for increasing the yield of the crop
Option C- Protecting the crops from weeds, pests, rodents, harmful pesticides, etc. can definitely help in increasing the crop yield.
Hence, all three points are the major activities for improving crop yields.
So, the correct answer is '
All of these'.
Rotation of crops is carried out to
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Increase convenience for the farmers
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Increase variation in the mineral content of soil
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Increase in nitrogen content of the soil
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Increase diversity of plant habitats
Explanation
The practice of growing a series of different types of crops in the same area in sequenced seasons is called crop rotation.
The advantages of crop rotation are:-
1)
It helps in reducing soil erosion.
2) It increases soil fertility and crop yield.
3)
The soil of farms do not get deficient of one type of nutrients.
So, the correct answer is '
Increase variation in the mineral content of soil'.
Rice, wheat and millets are good sources of
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Carbohydrate
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Proteins
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Fat
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Minerals
Explanation
Cereals such as wheat, rice, millets, jowar and sorghum are excellent sources of carbohydrates which are the primary sources of energy for our body.
Hence the correct option is A.
State whether the following statements are true or false. Correct the false statements.
Using good quality seed is the only criterion to get high yield.
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True
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False
Explanation
Using good quality seed is the only criterion to get high yield. False. Apart from good quality seeds one also needs to follow proper agricultural practices .
Practices that help farmers to get more income is/are
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Mixed farming
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Intercropping
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Integrated farming
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All of these
Explanation
The majority of our population depends on agriculture for their livelihood. Increasing the incomes of people working in agriculture is therefore necessary to combat the problem of hunger. Scientific management practices should be undertaken to obtain high yields from farms. For sustained livelihood, one should undertake mixed farming, intercropping, and integrated farming practices, for example, combine agriculture with livestock/poultry/fisheries/
bee-keeping.
Hence the correct option is D.
The shorter duration crops help the farmer :
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By making variety economical
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By allowing farmers to grow multiple rounds of crops in a year
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By getting uniform maturity and easy harvesting
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Both (A) and (B)
Explanation
The short maturity period of crops helps farmers in multiple rounds of cultivation in less expenditure during a short period.Thus, overall variety improvement makes the situation more profitable, They can grow different crops several times in a year instead of just growing a single crop throughout the year.
so, the correct answer is '
Both (A) and (B)'
Pulses such as pea and gram are good sources of
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Carbohydrates
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Proteins
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Vitamins
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Fats
Explanation
Pulses such as pea, gram, black gram and lentils are excellent sources of proteins that are essential for body growth.
Hence the correct option is B.
State whether the following statements are true or false. Correct the false statements.
Growing different crops in different seasons in the same field will deplete the soil of nutrients.
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True
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False
Explanation
Growing different crops in different seasons in the same field will deplete the soil of nutrients. False. Growing different crops In the same field actually help to improve the fertility of the field.
The method of incorporating desirable qualities in crop varieties is..
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Crop- rotation
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Hybridisation
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Intercropping
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Multiple cropping
Explanation
Hybridization is a method of developing new traits by combining the characters of two different varieties of crops. It is a way of crop-variety improvement. Hence B is correct.
Rest others, crop-rotation, Intercropping and multiple cropping are different farming methods for crop production management.
What are genetically modified crops?
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Plants which are crossed with plants of different genera
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Plants containing genes that have been introduced into them
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Plants having superior genes
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None of these
Explanation
Hybridisation refers to crossing between genetically dissimilar plants. This crossing may be intervarietal (between different varieties), interspecific (between two different species of the same genus) or intergeneric (between different genera). Another way of improving the crop is by introducing a gene that would provide the desired characteristic. This results in genetically modified crops.
Hence the correct option is B.
The crops grown during the rainy season are called rabi crops.
Is the above statement true or false?
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True
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False
Explanation
There are some crops grown during the rainy or the kharif season from the month of June to October, and some of the crops are grown in the winter season, called the rabi season from November to April. Paddy, soyabean, pigeon pea, maize, cotton, green gram and black gram are kharif crops, whereas wheat, gram, peas, mustard, linseed are rabi crops.
Hence the given statement is false.
What is hybridisation?
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Crossing between genetically dissimilar plants
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Introduction of new genes into a plant
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Fusion between male and female gametes
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None of the above
Explanation
Correct Option: A
Explanation:
Hybridization
is the process of crossing two genetically different individuals to result in a third individual with a different, often preferred, set of traits. Plants of the same species cross easily and produce fertile progeny. Such plants are referred to as cross-pollinated plants.
The objective of hybridization is to combine desirable genes found in two or more different varieties and to produce pure-breeding progeny superior in many respects to the parental types.
Longer duration between sowing and harvesting is ideal for a crop.
Is the above statement true or false?
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True
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False
Explanation
The shorter the duration of the crop from sowing to harvesting, the more economical is the variety. Such short duration allow farmers to grow multiple rounds of crops in a year. Short duration also reduces the cost of crop production.
Hence the given statement is false.
Wheat, gram and peas are examples of
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Kharif crops
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Monsoon crops
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Rabi crops
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None of these
Explanation
There are some crops grown during the rainy or the kharif season from the month of June to October, and some of the crops are grown in the winter season, called the rabi season from November to April. Paddy, soyabean, pigeon pea, maize, cotton, green gram and black gram are kharif crops, whereas wheat, gram, peas, mustard, linseed are rabi crops.
Hence the correct option is C.
Hybridisation can be done only between plants belonging to the same species.
Is the above statement true or false?
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True
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False
Explanation
Hybridisation refers to crossing between genetically dissimilar plants. This crossing may be
intervarietal (between different varieties), interspecific (between two different species of the same genus) or intergeneric (between different genera).
Hence the given statement is false.
Berseem and Sudan grass are grown to be used as
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Food for humans
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Food for livestock
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Manure
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Green manure
Explanation
Fodder crops like berseem, oats or sudan grass are raised as food for the livestock in animal husbandry.
Hence the correct option is B.
Green revolution has led to
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increased production of food grains
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increased production of milk
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increased production of vegetables
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increased afforestation
Explanation
Efforts to meet the food demand by increasing food production have led to some successes so far. We have had the green revolution, which contributed to increased food-grain production. We have also had the white revolution, which has led to better and more efficient use as well as availability of milk.
Hence the correct option is A.
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