Solution of Chapter 12. Mineral Nutrition (Biology NCERT Book)

1 ‘All elements that are present in a plant need not be essential to its survival’ comment.

2 Why is purification of water and nutrient salts so important in studies involving minerals nutrition using hydroponics?

3 Explain with examples: macro nutrients, micro nutrients, beneficial nutrients, toxic elements and essential elements.

4 Name at least five different deficiency symptoms in plants. Describe them and correlate them with the concerned mineral deficiency.

5 If a plant shows a symptoms which could develop due to deficiency of more than one nutrient, how would you find out experimentally the real deficient mineral element?

6 Why does deficiency symptoms appear first in younger parts of certain plant while in others they do so in mature organs?

7 How are the minerals absorbed by the plants?

8 What are the conditions necessary for fixation of atmospheric nitrogen by Rhizobium? What is their role in N_2- fixation?

9 What are the steps involved in formation of a root nodule?