Hybridisation

Q.

A___Of Sheep. Fill In The Blanks With A Collective Noun.

Q.

what is mean by agronomy?

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What is genetic manipulation? How is it useful in agricultural practices?

Q.

Define plant breeding ? Describe the various methods of plant breeding.

Q. Hybridization refers to crossing between genetically dissimilar plants.

1. True
2. False

Q. Differinate between hybridization and gene modification by which food resource can be helped

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What are the main objectives of crop protection management?

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Discuss two ways of encorporating desirable characteristics into crop varieties.

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Explain various steps in hybridization of crop plants.

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List out some useful traits in improved crops.

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Question 28
Define the term hybridization and photoperiod.

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What is vermicomposting?

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Question 5
Find out the correct sentence

(i) Hybridization means crossing between genetically dissimilar plants
(ii) Cross between two varieties is called as interspecific hybridization
(iii) Introducing genes of the desired character into a plant gives a genetically modified crop
(iv) Cross between plants of two species is called as inter varietal hybridisation

(a) (i) and (iii)
(b) (ii) and (iv)
(c) (ii) and (iii)
(d) (iii) and (iv)

Q. Figure 15.1 shows two crop fields [plots A and B] have been treated by manures and chemical fertilizers respectively. Keeping other environmental factors same. Observe the graph and answer the following question​
(i) Why does plot B show sudden increase and then gradual decrease in yield?​

Q.

The technique of growing two or more different crops together in the same field is known as:

1. Mixed cropping

2. Mixed farming

3. Intercropping

4. Crop rotation

Q. Which among the following statements are correct with respect to hybridisation?

Statement 1:Hybridisation of two different species of the same genus is interspecific hybridisation.
Statement 2: Hybridisation of different genera is possible.
Statement 3: Introduction of a gene is intergeneric hybridisation.

1. Statements 1 and 3 are correct.
2. Statements 1 and 2 are correct.
3. Only statement 3 is correct.
4. Statements 1 , 2, and 3 are correct.

Q.

Which crops are collectively known as "Dry crops"?

Q.

Kranti, Pusa Agarni and Pusa Bold are improved varieties of

1. Urad bean

2. Sunflower

3. Chick Pea

4. Mustard

Q. Hybridisation involves crossing between genetically similar plants to produce plants with useful characters.

1. False
2. True

Q. Tallness and profuse branching is a desired agronomic characteristics for crops.

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What are the different practices that are involved in crop production management?

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Question 4
What is genetic manipulation? How is it useful in agricultural practices?

Q. What are the different types of crossing in hybridization?

1. Intervarietal
2. Interspecific
3. Intergeneric
4. Inter phyla

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Question 1
Explain any one method of crop production which ensures high yield.

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Where is Recombinant DNA used?

Q. Question 36
Discuss the role of hybridisation in crop improvement.

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How hybridization and genetic improvement help in production of disease resistant and high yielding varieties. Explain in detail

Q. 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.

1. True
2. False

Q.

Question 48
The below figure shows the two crop fields [Plots A and B] have been treated by manures and chemical fertilizers respectively, keeping other environmental factors same. Observe the graph and answer the following questions.

(i) Why does plot B show sudden increase and then gradual decrease in yield?
(ii) Why is the highest peak in plot A graph slightly delayed?
(iii) What is the reason for the different pattern of the two graphs?

Q.

The method used to obtain plant varieties with high yield and other desirable characters is:

1. budding

2. selection

3. hybridisation

4. reduction