NCERT Class 8 Science Chapter 1 Crop Production and Management Extra Questions

NCERT Class 8 Science Chapter 1 Crop Production and Management Extra Questions and Answers

Crop Production and Management Extra Questions

Crop Production and Management Extra Questions

Class 8 Science Chapter 1 Extra Questions and Answers – Crop Production and Management. Here in this Page Class VII Students can Learn Extra Questions & Answer 1st Chapter Science fully Inside.

We Provided Here Crop Production and Management Science Chapter 1 Long Answer Type Question, Very Short Type Questions (VSA) / MCQ Type Questions, Short Type Questions (SA).

Class 8 Science Chapter 1 Extra Question with Answer – Crop Production and Management

Science Chapter 1 Crop Production and Management Class 8 Inside 5 Marks, 3 marks, 2 Marks & And 1 Marks Important Questions and Answers.

1) Fill in the blanks:

a) Soya bean is a ____ crop. (Kharif crop)

b) ____ is used for loosening the soil. (Hoe)

c) ____ is a man-made inorganic salt. (Fertilizer)

d) ____ is used for sowing seeds. (Seed drill)

2) Multiple choice questions:

a) Urea is a ____?

a) Fertilizer b) Manure

Ans. a) Fertilizer

b) An example of a rabi crop is ____?

a) Paddy b) Cotton c) Wheat

Ans. c) Wheat

c) Harvesting is manually done by ____?

a) Harvester b) Sickle

Ans. b) Sickle

d) The use of ____ in ploughing saves labor and time?

a) Plough b) Hoe c) Cultivator

Ans. c) Cultivator

3) Answer the following questions:

a) What is manure? Write the advantages of manure?

Ans. Manure is the organic substance obtained from decomposition of plant or animal wastes.

The advantages of manure are –

i) It enhances the water holding capacity of the soil.

ii) It makes the soil porous due to which exchange of gases becomes easy.

iii) It increases the number of friendly microbes.

iv) It improves the texture of the soil.

b) What is harvesting? Which machine is used in harvesting?

Ans. Harvesting is the cutting of the mature crop manually or by machines.

Harvesting is done by machine called Harvester.

c) What is trilling? Which device is used for trilling the soil?

Ans. The supply of water to crops at regular intervals is called irrigating.

Plough is used for trilling the soil.

d) What are weed? What is weeding? What are weedicides?

Ans. The unwanted and uncultivated plants are called weed.

The removal of weeds is called weeding.

Weed are controlled by using certain chemicals, called weedicides.

e) Match the items of column I with the information of column II:

          Column I

Column II

a) Kharif crops 1) Threshing is carried out with the help of a machine
b) Threshing 2) are grown in the winter season
c) Animal husbandry 3) are sown in the rainy season
d) Combine 4) Separation of the grains from the chaff
e) Rabi crops scale 5) The rearing of animals at home or in farms in a large

 

Ans. a) – 3), b) – 4), c) – 5), d) – 1), e) – 2).

4) Long type questions:

a) What is irrigation? What are the traditional methods of irrigation? What are the modern methods of irrigation? What are the sources of water for irrigation?

Ans. The supply of water to crops at regular intervals is called irrigation.

The traditional methods of irrigation are pulley-system, chain pump and lever system.

The modern methods of irrigation are Sprinkler system and drip system.

The sources of water for irrigation are wells, tube wells, ponds, lakes, rivers, dams and canals.

b) Explain how fertilizer is different from manure.

Ans.   I) Fertilizer is a man-made inorganic salt but manure is a natural substance obtained by the decomposition of cattle dung and plant residues.

II) Fertilizer is prepared in factories but manure can be prepared in the fields.

III) Fertilizer does not provide any humus to the soil while manure provides a lot of humus to the soil.

IV) Fertilizers are very rich in plant nutrients like nitrogen, phosphorus and potassium while manure is relatively less rich in plant nutrients.

5) Mark your answer as per the codes provide below:

a) A: Farmers should cover their nose and mouth with a piece of cloth during spraying of weedicides.

R: Spraying of weedicides may affect the health of farmers.

I) Both A and R are true and R is the correct explanation of A.

II) Both A and R are true but R is not the correct explanation of A.

III) A is true but R is false.

IV) A is false but R is true.

V) Both A and R are false.

Ans. I. Both A and R are true and R is the correct explanation of A.

b) A: We do not have to substitute fertilizers with organic manure or leave the field uncultivated in between two crops.

R: Excessive use of fertilizers has made the soil less fertile and it has also become a source of water pollution.

I) Both A and R are true and R is the correct explanation of A.

II) Both A and R are true but R is not the correct explanation of A.

III) A is true but R is false.

IV) A is false but R is true.

V) Both A and R are false.

Ans. IV. A is false but R is true.

6) Farmers store grains in jute bags or metallic bins. However, large scale storage of grains is done in soils and granaries to protect them from pests like rats and insects. Dried neem leaves are used for storing food grains at home. For storing large quantities of grains in big godowns, specific chemical treatments are required to protect them from pests and microorganisms.

a) The large scale storage of grains is done in _____ and _____ to protect them from rat and insects. (Soils and granaries)

b) _____ are used for storing food grains at home. (Dried neem leaves)

 

More extra Questions and Answers 

Q.1) Fill in the blanks  (5)

1) When plants of the same kind are cultivated at one place on large scale, it is called a ______. (Crop)

2)The process of loosening and turning of the soil is called _______ and _________. (Tilling , Ploughing)

3) Sowing is an important part of ________ production. (Crop)

4) Fertilizer is an _______ Inorganic salt. (Manmade)

5) Food obtained from animals for which they are reared is called ______________.(Animal Husbandary)

 

In case you are missed :- NCERT Extra Questions for Microorganisms : Friend And Foe

 

Q.2) Say whether the following statements are true or false .If false , state them with the reason. (5)

1) Before Sowing the seeds, it is necessary to break stone clumps to get better yield.

Ans – False : Before Sowing the seeds, it is necessary to break stone clumps to get better yield.

2) Dried neem leaves are used for storing grains at home . – True

3) Dhekli& chain pump are traditional method of irrigation. – True

4) Fertilisers can be prepared in field.

Ans. False :Fertilisers  prepared in factories.

5) Cow & Goat are sources of milk . – True

 

Q.3) Define the following  (5)

1) Irrigation

Ans: The supply of water to the crops at regular intervals is called as irrigation.

2) Rabi crops

Ans:The crops grown in the winter season (From October to March)are called Rabi crops.

3) Ploughing

Ans: The process of loosening and turning of the soil is called as ploughing.

4) Weeds

Ans: The undesirable plants that grow naturally with the crop is called as weeds.

5) Animal Husbandry

Ans : Animals reared at home or farm to obtain food from them is called as animal husbandry.

 

Section 2 – Brief questions

Q.4) Give reason for the following (4)

1) Storage of grains after production is important.

Ans: a)Storage of grains after production is important to keep them safe from moisture ,insect,rats and other micro-organisms

b) As harvested garinss have more moisture and if they are kept/stored as it is then it will get spoiled or attacked by external organisms.

c) Thus,In order to prevent spoilage of grains proper storage is important.

 

2) Weeding is an necessary step to be performed.

Ans: a)Weeding is an necessary step because if not perfomed it affects the growth of plant

b)Some weeds are harmful and dangerous for animals and human beings

c)As weeds complete with crop plants for water, nutrients ,space , light .

 

Q.5) Answer in one sentence for the following (4)

1) What are types of crops classified based on the season?

Ans: Crops are classified in two types based on the season as below : Rabi crops and Kharif crops.

2) What is rich source of Vitamin D ?

Ans: Cod liver oil from fish is rich source of Vitamin D .

3) What is a drip system ?

Ans: Drip system is a system in which water falls drop by drop near the roots of the crop.

4) What are the sources of water irrigation ?

Ans: Sources of water irrigation are wells ,tubewells,lakes, ponds, river ,canal, dams.

 

Q.6) Differentiate between the following:(2)

1) Rabi crops and Kharif crops

kharif crops Rabi crops
1)The crops which are sown in rainy season are called Kharif crops 1)The crops grown in winter season are called Ruby crops.
2)Ex.Maize , Soyabean , Cotton & Groundnut 2)Ex.Wheat, Mustard, Pea & Gram

 

Q.7) Answer the following (9)

1) Define Manure and give its any 2 advantages.

Ans: i) Manure is a natural substance obtained by decomposition of cattle dung and plant residue.

ii) Advantages – a)It enhances the water holding capacity of the soil.

b) It increases the number of friendly microbes.

 

2) Describe modern methods of irrigation

Ans: Modern methods of irrigation are as below :

a) Sprinkler system – Sprinkler system is useful foe uneven land where sufficient water is not available. In these method, Perpendicular pipes which are having a rotating nozzle are joined the main pipeline at regular interval.When the water is allowed to flow , It gets sprinkled to the crop through the rotating nozzle .

b) Drip system – In these system , water falls drop by drop directly near the roots of the crop. These system is mostly helpful where the water availability is poor as these water saves the water wastage.

 

3) Explain the term – Harvesting .

Ans :i)The cutting crop after it is mature is called as Harvesting.

ii) During these crops are pulled out or cut close to the ground. It is either done manually by sickle or by a harvester machine.

iii) These period of Harvesting is also celebrated as “Harvest Festival”in all parts of India.

 

Q.8) Do as directed (10)

1) Complete the following steps (4)

a) Preparation of soil : Sowing : ___________ :Irrigation____________:_____________: Storage. (Adding manure &Fertilisers , Protecting from weeds , Harvesting )

b) Vitamin D : Fish > Milk : ___________ (Cow /Goat/Buffalo)

 

2) Name the following (6)

a) A machine used to pull/cut out the matured crops . (Harvester)

b) Keeping the produced crop grains away from micro organisms, moisture , insects under proper maintenance – (Storage)

c) A chemical through wich weeds are controlled – ( Weedicides)

d) A tool used for removing weeds and loosening the soil – (Hoe)

e) Crops grown from June to September are called – ( Kharif crops)

f) A natural substance obtained by the decomposition of cattle dung – (Manure)

 

For more updates, follow our page ⇒ Net Explanations

Updated: April 5, 2023 — 11:23 am

Leave a Reply

Your email address will not be published. Required fields are marked *