The statistical study of human population is called :

1. Population density
2. Demography
3. Mortality
4. Natality

The basic structural unit of human chromosome is :

1. Nucleotide
2. Nucleic acid
3. Nucleoside
4. Nucleosome

The waxy substance of cuticle layer consists of :

1. Cutin
2. Fat
3. Histone
4. Protein

Name the following :

(i) The organelle which initiates cell division.

(ii) The genetic constitution of an organism.

(iii) The plastid which contains coloured pigments (yellow/orange/red, etc.)

(iv) A solution whose concentration is greater than that of the cell sap.

(v) The biological process which is the starting point of the food chain.