Biology — Sample Question Bank

R and S

Reason — Malaria and Cholera are not genetic disorders. They are caused by plasmodium and bacteria respectively. Haemophilia, Colour blindness and Albinism are genetic disorders.

Interphase is the resting but metabolically active stage of the cell cycle.

Natality

Reason — Natality refers to the birth rate, or the number of live births per thousand people per year.

$6\text{CO}_2 + 12\text{H}_2\text{O} \xrightarrow[\text{chlorophyll}]{\text{light energy}} \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{H}_2\text{O} + 6\text{O}_2 \uparrow$

Centromere

Reason — Duplicated chromosomes (sister chromatids) are joined at a point termed Centromere.

NADP - Nicotinamide Adenine Dinucleotide Phosphate.

X chromosome

Reason — Human ovum have 'XX' as pair of sex chromosomes.

Balanced chemical equation representing the process of photosynthesis is given below:

$6\text{CO}_2 + 12\text{H}_2\text{O} \xrightarrow[\text{chlorophyll}]{\text{light energy}} \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{H}_2\text{O} + 6\text{O}_2 \uparrow$

(i) Polymerization

(ii) Centromere

(iii) Haemoglobin

(iv) Ureter

(v) Cerebrum

(i) Alternative forms of a gene, occupying the same position on homologous chromosomes and depicting different forms of the same character are called alleles.

(ii) Diffusion is the free movement of molecules of a substance from the region of their higher concentration to the region of their lower concentration when the two are in direct contact.

(iii) Photolysis is the splitting of water molecules into hydrogen ions and oxygen in the presence of light.

(iv) The observable characteristics which are genetically controlled are called as phenotype.

(v) Population density is the number of individuals per square kilometre (km²) at any given time.