NCERT Solutions for Class 11 Biology Chapter 12

Mineral Nutrition Class 11

Chapter 12 Mineral Nutrition Exercise Solutions

<< Previous Chapter 11 : Transport in Plants Next Chapter 13 : Photosynthesis in Higher Plants >>

Exercise : Solutions of Questions on Page Number : 205

Q1 :  

'All elements that are present in a plant need not be essential to its survival'. Comment.


Answer :

Plants tend to absorb different kinds of nutrients from soil. However, a nutrient is inessential for a plant if it is not involved in the plant's physiology and metabolism. For example, plants growing near radioactive sites tend to accumulate radioactive metals. Similarly, gold and selenium get accumulated in plants growing near mining sites. However, this does not mean that radioactive metals, gold, or selenium are essential nutrients for the survival of these plants.

Answer needs Correction? Click Here

Q2 :  

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


Answer :

Hydroponics is the art of growing plants in a nutrient solution in the absence of soil. Since the plant roots are exposed to a limited amount of the solution, there are chances that the concentrations of oxygen and other minerals in the plant roots would reduce. Therefore, in studies involving mineral nutrition using hydroponics, purification of water and nutrient salts is essential so as to maintain an optimum growth of the plants.

Answer needs Correction? Click Here

Q3 :  

Explain with examples: macronutrients, micronutrients, beneficial nutrients, toxic elements and essential elements.


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q4 :  

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


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q5 :  

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


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q6 :  

Why is that in certain plants deficiency symptoms appear first in younger parts of the plant while in others they do so in mature organs?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q7 :  

How are the minerals absorbed by the plants?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q8 :  

What are the conditions necessary for fixation of atmospheric nitrogen by Rhizobium. What is their role in N2 -fixation?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q9 :  

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


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q10 :  

Which of the following statements are true? If false, correct them:

(a) Boron deficiency leads to stout axis.

(b) Every mineral element that is present in a cell is needed by the cell.

(c) Nitrogen as a nutrient element, is highly immobile in the plants.

(d) It is very easy to establish the essentiality of micronutrients because they

are required only in trace quantities.


Answer :

Please Register/Login to get access to all solutions Facebook Login
<< Previous Chapter 11 : Transport in Plants Next Chapter 13 : Photosynthesis in Higher Plants >>

Biology : CBSE NCERT Exercise Solutions for Class 11th for Mineral Nutrition will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

Popular Articles