~◾~ 📚 CLASS 8 TH 📚 ~◾~
📌SAYAR Digital Solution for Class 8 are solved by experts in order to help students to obtain excellent marks in their board examination. All the questions and answers that are present in the RBSE, CBSE, NCERT Books has been included in this page.
Here we have provided Updated NCERT Solutions for Class 8 for Exams. NCERT Digital Solutions clear your concepts to the core ensuring to stay with you in the long run. These are created by experts in accordance with the RBSE and CBSE curriculum. You can find 100% accurate step-by-step solutions for every question in all the latest curriculum. Practice with these daily to perform better in annual exam.
Here we have provided Updated NCERT Solutions for Class 8 for Exams. NCERT Digital Solutions clear your concepts to the core ensuring to stay with you in the long run. These are created by experts in accordance with the RBSE and CBSE curriculum. You can find 100% accurate step-by-step solutions for every question in all the latest curriculum. Practice with these daily to perform better in annual exam.
| Board | RBSE and CBSE |
| Class | Class 8 |
| Subject | Science |
| Chapter | Chapter 1 |
| Chapter Name | Crop Production and Management |
| Number of Solved Questions | 77 Questions |
| Category | Sayar digital Solution |
MCQ Exercise
Question 1.
Rhizobium bacteria fix atmospheric
(a) nitrogen
(c) carbon dioxide
(b) oxygen
(d) hydrogen
Answer - (a) nitrogen
Nitrogen of atmosphere is fixed by rhizobium bacteria.
Question 2.
The supply of water to crops at different intervals is called
(a) watering
(b) irrigation
(c) harvesting
(d) none of these
Answer - (b) irrigation
The supply of water to crops at different intervals is called irrigation.
Question 3.
The sources of irrigation are:
(a) wells
(b) damr
(c) canals
(d) all of these
Answer - (d) all of these
The sources of irrigation are wells, dams and canals.
Question 4.
The chemicals used to control weeds are called:
(a) pesticides
(b) insecticides
(c) weedicides
(d) all of these
Answer-(c) weedicides
The chemicals used to control weeds are called weedicides.
Question 5.
Harvesting is a task of:
(a) cutting of crop after it is-mature
(c) separating of grain seeds from chaff
(b) cutting of crop before it is mature
(d) none of these
Answer - (a) cutting of crop after it is-mature Harvesting is a task of cutting of crop after it is mature.
Question 6.
Winnowing is a method of separating:
(a) soil from chaff
(b) grain from chaff
(c) soil from grain
(d) none of these
Answer - (b) grain from chaff
Winnowing is a method of separating grain from chaff.
Question 7.
At home to store grains we use:
(a) wet neem leaves
(b) dried neem leaves
(c) dried mango leaves
(d) dried peepal leaves
Answer - (b) dried neem leaves Dried neem leaves are used to store grains at home.
Question 8.
The plant roots containing nitrogen fixing bacteria are:
(a) maize
(b) potato
(c) pea
(d) onion
Answer-(c) pea
The roots of pea plantcontain nitrogen fixing bacteria because it is a leguminous
Question 9.
A combined harvester and thresher is called:
(a) combo
(b) combine
(c) harvester-thresher
(d) none of these
Answer
(b) combine
Combine is a combined harvester and thresher.
Question 10.
Before storing, the grains are properly dried in the:
(a) sun
(b) air
(c) fan
(d) none of these
Answer
(a) sun
The grains are properly dried in the sun before storing.
Question 11.
Which one of the following provide us manure:
(a) dog
(b) cattle
(c) frog
(d) birds
Answer
(b) cattle
Cattle provide us manure in the form of dung.
Question 12.
The process of separating grains from chaff is known as:
(a) threshing
(b) harvesting
(c) winnowing
(d) transplantation
Answer- (a) threshing
Threshing is the process of separating grains from chaff.
Question 13.
The process of cleaning grains from chaff is known as:
(a) freshing
(b) harvesting
(c) winnowing
(d) transplantation
Answer
(c) winnowing
Winnowing is the process of separating grains from chaff.
Question 14.
Growing of legume crop in between wheat crops is called:
(a) crop improvement
(b) crop rotation
(c) mixed cropping
(d) none of these
Answer
(b) crop rotation
Crop rotation is growing of legume crop in between wheat crop.
Question 15.
Agriculture can be defined as:
(a) art of growing vegetables
(b) art of growing fruits
(c) art of growing flowers
(d) all of these
Answer
(d) all of these
All the these. Agriculture is an art of growing vegetables, flowers and fruits.
Question 16.
Pesticides are used to destroy:
(a) pests
(b) weeds
(c) crops
(d) none of these
Answer-(a) pests
Pesticides are used to destroy pests.
Question 17. is an organic matter.
(a) manure
(b) fertilizer
(c) weedicide
(d) pesticide
Answer
(a) manure
Manure is an organic matter.
Question 18.
‘Silos’ are used to:
(a) grow crops in the fields
(b) protect grains from pests like rats and insects
(c) storage damaged grains
(d) none of these
Answer
(b) protect grains from pests like rats and insects
Silos are used to, protect grains from pests like rats and insects.
Question 19.
What is the effect of weeding ?
(a) It does not affect the yields
(c) It helps in growth of crops by increasing the yield
(b) It affects- the growth of crops by reducing the yield
(d) None of the above
Answer
(b) It affects- the growth of crops by reducing the yield Weeding affects the growth of crops by reducing the yield.
Question 20.
Which of the following can make their own food:
(a) humans
(b) animals
(c) plants
(d) all of these
Answer-(c) plants
Tilling does not help in losing moisture whereas it helps in improving air circulation in the soil and loosening the soil.
Question 21.
Which of the following body function is carried out by the energy from the food: (a) digestion
(b) respiration
(c) excretion
(d) all of these
Answer
(c) excretion
Plants can make their own food.
Question 22.
The plants of the same kind grown and cultivated at one place on a large scale is called: (a) crop
(b) pulses
(c) cereals
(d) none of these
Answer
(d) none of these
All of these need energy from the food.
Question 23.
The science of agriculture includes:
(a) management of plants
(b) management of animals
(c) management of plants and animals
(d) management of humans
Answer
(a) management of plants
Crop are the plants of the same kind grown and cultivated at one place on a large
Question 24.
The crops which are sown in the rainy season are called:
(a) kharif crops
(b) rabi crops
(c) zayed crops
(d) none of these
Answer
(a) kharif crops
Management of plants is included in the science of agriculture.
Question 25.
The crops grown in the winter season are called:
(a) kharif crops (b) rabi crops
(c) zayed crops
(d) none of these
Answer
(a) kharif crops
Kharif crops are sown in rainy season.
Question 26.
Big pieces of soil are called:
(a) stones
(b) crumbs
(c) sand
(d) none-of these
Answer
(b) crumbs
Rabi crops are sown in winter season.
Question 27.
The loosened soil helps in the growth of:
(a) earthworms
(b) microbes
(c) plants
(d) all of these
Answer
(b) microbes
Crumbs are big pieces of soil.
Question 28.
The process of loosening and turning of the soil is called:
(a) sowing
(b) tilling or ploughing
(c) levelling
(d) none of these
Answer: (b) tilling or ploughing
The process of loosening and turning of the soil is called tilling or ploughing. This is done by using a plough.
Question 29.
The levelling of soil is done with the help of a:
(a) leveller
(b) plough
(c) hoe
(d) cultivator
Answer
(b) plough
Tilling or ploughing is aprocess of loosening and turning of the soil.
Question 30.
Weeds are defined as:
(a) useful plants present in the field
(b) undesirable pests present in the field (c) plants that cannot be used at all
(d) undesirable plants present in the field
Answer
(a) useful plants present in the field Leveller is used for levelling of soil.
Question 31.
The tool used for removing weeds is:
(a) plough
(c) hoe
(b) leveller
(d) none of these
Answer
(d) none of these
Undesirable plants present in the field are called weeds.
Question 32.
Paddy is grown in: (a) winter season
(b) rainy season
(c) summer season
(d) all of the above
Answer
(c) summer season
Hoe is tool used for removing weeds.
Question 33.
Good, healthy seeds when put in water then they:
(a) sink
(b) float
(c) can’t say
(d) none of these
Answer
(b) float
Rainy season is the best season for growing paddy.
Question 34.
Transplantation is done, in the case of :
(a) maize
(b) wheat
(c) paddy
(d) none of these
Answer
(a) maize
Good, healthy seeds when put in water is sink.
Question 35.
Which of the following is not a fertiliser:
(a) urea
(b) cow-dung
(c) potash
(d) super phosphate
Answer
(c) potash
Paddy transplanted.
Question 36.
Fertilisers are produced in:
(a) fields
(b) wells
(c) factories
(d) none of these
Answer
(b) wells
Cow dung is not a fertiliser.
Question 37.
Which of the following produces manures:
(a) cattle dung
(b) human- waste
(c) plant residue
(d) all of these
Answer
(c) plant residue
Fertilisers are produced in factories.
Question 38.
Which of the following quality of soil is improved by manures:
(a) water retaining capacity
(b) toll
(c) nutrients
(d) all of these
Answer
(d) all of these
All of these, (cattle dung, human waste, plant residue) produces manures.
Question 39.
Rhizobium bacteria is present in the nodules of the roots:
(a) wheat
(b) leguminous plants
(c) maize
(d) onion
Answer
(d) onion
All of these. Manures improve the water retaining capacity, texture and nutrients ofsoil.
Question 40.
Which of the following is not true about tilling:
(a) It improves air circulation in the soil
(b) It helps in loosening the soil
(c) It helps in losing moisture
(d) It is also called ploughing
Answer
(b) It helps in loosening the soil
Rhizobium bacteria is present in the nodules of the roots of leguminous plants.
State whether the following statements are True or False:
Question 1.
Earth worm is a friend of the fanner.
Answer:True
Question 2.
Crop rotation helps to increase the fertility of soil.
Answer:True
Question 3.
Kharif crops need more water than rabi crops.
Answer:True
Question 4.
The function of manures and fertiliser are different.
Answer:True
Question 5.
Paddy requires a lot of water.
Answer:True
Question 6.
Crop can be damaged by excess supply of water.
Answer:True
Question 7.
Manures are very rich in plant nutrients like nitrogen, phosphorus and potassium.
Answer: False
Question 8.
In sprinkler system, the water falls drop by drop just at the position of the roots.
Answer: False
Question 9.
The removal of husk from grains is called threshing.
Answer: True
Question 10.
Weedicides make the weeds grow well.
Answer: False
Question 11.
Canals, wells and rains are the sources of water for irrigation.
Answer: True
Question 12.
Humans settled down to live in one place only after they learnt to grow crops.
Answer: True
Question 13.
Supply of water to crops at one time is called irrigation.
Answer: False
Question 14.
We get cod liver oil from fish which is rich in vitamin-D.
Answer: True
Question 15.
Fertilisers are prepared in the fields.
Answer: False
Fill in the blanks: -
Question 1.
The growing of same kind of plants is called ……………………
Answer : crop
Question 2.
Levelling of soil is done by ……………………
Answer: leveller
Question 3.
Large scale storing of grains is done in ……………………
Answer: silos and granaries
Question 4.
Manure is an …………………… substance obtained from the decomposition of plant or animal wastes.
Answer : organic
Question 5.
The process of loosening and turning of the soil is called …………………… or ……………………
Answer
tilling or ploughing
Question 6.
Plough contains a strong triangular iron strip called ……………………
Answer : ploughshare
Question 7.
The crops grown in the winter season are called …………………… crops.
Answer: rabi
Question 8.
Ploughing helps to …………………… the soil.
Answer : loosen
Question 9.
Hoe is a tool used for removing ……………………
Answer: weeds
Question 10.
The chemicals used to kill weeds are called ……………………
Answer : weedicide
Question 11.
Seed drill is used for ……………………
Answer : sowing
Question 12.
The bacteria present in grain plant is ……………………
Answer : rhizobium
Question 13.
A fertiliser is an …………………… salt.
Answer : inorganic
Question 14.
Manures provides a lot of …………………… to the soil.
Answer : humus
Question 15.
Manures ……………. the water holding capacity of the soil.
Answer: enhances
Question 16.
Unwanted plants which grow along with the main crop are called ……………………
Answer : weeds
Question 17.
The machine used for cutting and threshing of crops are called ……………………
Answer: combine
Question 18.
The rearing and caring of animal to obtain food on large scale is called ……………………
Answer:animal husbandry
Question 19.
Watering the crop plants is called …………………..
Answer :irrigation
Question 20.
The bacteria present in the nodules of the roots of leguminous plants fix atmospheric
……………………
Answer: nitrogen
Question 21.
The cutting of crop after it is mature is called ……………………
Answer: harvesting
Question 22.
…………………… is the process of transferring healthy seedlings from a nursery to the main field.
Answer
Transplantation
