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12th Standard English Medium Biology (Botany) Subject Plant Breeding Creative 3 Mark Questions with Solution Part - II updated Creative Questions

Published on: 13/05/2022

QB365 provides detailed and simple solution for every Creative Questions in class 12 Biology Subject. It will helps to get more idea about question pattern in every Creative questions with solution.

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Std: 12th Standard - Biology

chapter: - Creative Questions

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Questions:

Generic 3

5 x 3 = 15

A plant breeder developed a hybrid sugarcane by grafting two different varieties with desirable characters. The resultant hybrid showed excellent growth and productivity with increased sucrose content compared to its parental forms.
(I) What does this phenomenon refers to?
(il) How this condition can be maintained through further generation?

Yesterday, Ramu visited his friend's Orchard, where in he noticed few flowers of certain guava trees are covered using thin paper bags.
(I) Name the process carried out there.
(ii) Why it was done so?

State the objective of using green manuring.

Write a note on Green Manuring.

Mention any three advantages of Arbuscular mycorrhizal association.

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Answers Key:

Generic 3

5 x 3 = 15

(i) Heterosis or Hybrid vigour
(ii) Vegetative propagation is the best-suited measure to maintain the vigorousity of hybrid.

(i) The process is referred as bagging in plant hybridization.
(ii) It is done after emasculation to protect the contact of the stigma of the flower against any other pollen grain.

Green manuring helps to increase the content of nitrogen soil and also improves the structure and physical property of soil

Green manuring is defined as the growing of green manure crops and use of these crops directly in the field by ploughing. One of the main objectives of the green manuring is to increase the content of nitrogen in the soil. Also, it helps in improving the structure and physical properties of the soil. The most important green manure crops are Crotalaria juncea, Tephrosia purpurea, and Indigofera tinctoria.

i) Arbuscular mycorrhizae have the ability to dissolve the phosphate found in soil.
ii) Provides resistance against diseases, germs, and unfavorable weather conditions.
iii) It assures water availability.