Biology

The protein coat that surrounds the genetic material of a virus is called the capsid. It protects the viral nucleic acid and aids in its delivery into host cells.

The abducens nerve (cranial nerve VI) controls the lateral rectus muscle, which abducts the eye. Damage to this nerve results in impaired eye movement, specifically difficulty moving the eye outward.

In domestic fowl (birds), females are heterogametic (ZW), meaning they have two different sex chromosomes, while males are homogametic (ZZ). Earthworms and rabbits do not have heterogametic females; rabbits have XY males and XX females, and earthworms are hermaphrodites. Therefore, the correct answer is Domestic fowl.

Sulphur is classified as a secondary plant nutrient because plants require it in moderate amounts, unlike primary nutrients such as nitrogen and phosphorus which are needed in larger quantities. Therefore, among the options, sulphur is the correct secondary nutrient.

Secretin is a hormone, not an enzyme. Chemotrypsin (correctly spelled chymotrypsin) and pepsin are enzymes involved in digestion. Therefore, option B is the correct answer as it is not an enzyme.

In mosses, the dominant phase of the life cycle is the haploid gametophyte, which is the green, photosynthetic plant we commonly see. This contrasts with many other plants where the diploid sporophyte is dominant.

Primatology is the scientific study of primates, including monkeys, apes, and related animals. Therefore, option B is correct as it directly defines the subject of primatology.

The gene is the smallest unit of heredity because it is a segment of DNA that carries the instructions for a specific trait. Chromosomes contain many genes, and nucleotides are the building blocks of DNA, but genes are the functional units passed from parents to offspring.

Pollination of flowers by birds is specifically termed 'ornithophily.' This term combines 'ornitho-' meaning bird, and '-phily' meaning attraction or affinity, accurately describing bird-mediated pollination.

Epidemiology is the branch of microbiology and medicine that studies the occurrence, distribution, and control of diseases in human populations, making it the correct answer.