Nucleotides are made up of

1. phosphate, sugar and nitrogenous bases
2. potassium, sugar and nitrogenous bases
3. potassium, sugar and amino acids
4. phosphate, sugar and amino acids

The X gene of the sex-chromosome can never pass from the

1. father to daughter
2. father to son
3. mother to daughter
4. mother to son

Assertion (A) The 'Swachh Bharat Abhiyan' was officially launched on 2nd Oct 2015.

Reason (R) Our Prime Minister Shri Narendra Modi took the cleanliness pledge at India Gate in Delhi. He wanted to fulfill Mahatma Gandhi's dream of a clean and hygienic India.

1. Both A and R are true
2. Both A and R are false
3. A is true and R is false
4. A is false and R is true

During the mechanism of opening and closing of stomata, the important factor is

1. the protein content of the cells
2. the turgid and flaccid state of the guard cell
3. the starch content of the cells
4. the presence of chloroplast in the guard cell