NEET : Multiple Choice question: Outbreeding devices and Artificial Hybridisation

1. Hybrid vigour or inbreeding depression  is caused by the continuous 

A. Cross pollination

B. Self pollination 

C. Double fertilisation 

D. Triple fusion

Answer : B Explanation 

2. Nature developed outbreeding devices to promote :

A. Cross pollination

B. Self pollination 

C. Genetic variation

D. All of the above

Answer: A Explanation 

3. Consider the following devices that can prevent autogamy and select the correct code:

1. There is no synchronization between pollen release and stigma receptivity.

2. In some plant species, pollens are released before the stigma receptive or stigma become receptive much before than pollen release.

3. In some plant species, anther and stigma are located at different position so that pollen can not make contact with stigma.

A. Only 2    B.Only 1

C. Both 1 and  2

D. 1, 2 and 3

Answer : D Explanation 

4. Self incompatibility is a genetic mechanism to prevent self pollination. Self incompatibility refer to:

A. Preventing of germination or growth  of pollen tube from the fertilizing the ovule.

B. There is no synchronization between pollen release and stigma receptivity.

C. Location of Anther and stigma are at different position.

D. Production of unisexual flower in plants.

Answer : A Explanation 

5. In which of the plants , male flower and female flower are produced.

A. Papaya and Maize

B. Papaya and Castor 

C. Maize and Castor 

D. Papaya, Maize and Castor

Answer: C Explanation 

6. Production of unisexual flower i.e male and female flower are different in same plant, prevent 

A. Xenogamy  but not autogamy. 

B. Geitonogamy but not autogamy. 

C. Xenogamy  only 

D. Autogamy but not geitonogamy.

Answer : D Explanation 

7. Consider the following statement and select the correct code:

1. Papaya is diocious because male and female flowers are present on different plants.

2. Dioecy condition prevent both autogamy and geitonogamy.

A. Only 1  B. Only 2 

C. Both 1 and 2 

D. Neither 1 nor 2 

Answer : C Explanation 

8. Which one of the following is/ are approach in Crop improvement programme.

A. Artificial Hybridisation 

B. Emasculation

C. Bagging 

D. All of the above

Answer : D Explanation 

9. Consider the following statement and select the option corresponding to correct statements:

1. Non emascusled flower is covered  by suitable size of  bag made up of butter paper.

2. After dusting of desired pollen grain, there is no need of rebagging.

3. In Unisexual flower, Emasculation is essential.

4. In Crop improvement programme,  stigma is protected from unwanted pollen grain.

A . One    B . Two

C. Three  D. Four

Answer: A Explanation 

10. Consider the following statement and select the correct code 

1. Removal of Anther from flower by using of forceps called emasculation. 

2. Emascusled flower is covered  by suitable size of  bag made up of butter paper. This is called bagging. 

3. After dusting of desired pollen grain, the stigma is rebagged.

A. 1 and 2   B. 1 and 3

C. 2 and 3    D. 1, 2 and 3

Answer : D  Explanation