Criteria for Essentiality

Q.

The name of the elements oxygen and hydrogen is given by the scientist ______.

Q. Arnon and Stout proposed

1. Importance of plant growth
2. Law of minimum
3. Active absorption of ions
4. Criteria for essentiality of elements

Q.

Which two minerals are not needed by the majority of plants but needed by almost all animals?

1. Carbon and Calcium

2. Sodium and Magnesium

3. Oxygen and Nitrogen

4. Sodium and Iodine

Q.

What is the cardinal number of following sets?

The set of scientists: Raman, Bhabha and Einstein

Q. Which of the following is/are the criteria required for the essentiality of an element in plants?

1. The element must be directly involved in the metabolism of the plant
2. The element must be absolutely essential for growth and reproduction
3. The requirement of the element is specific and cannot be replaced by another element
4. All of these

Q. One of the following is not a criterion for determining the essentiality of an element. Choose the one.

1. The element is required for normal growth and reproduction.
2. The element is distributed in all parts of the plants body equally.
3. The element is specific and not replaceable by another.
4. The element play a direct role in plant metabolism.