Question Bank [2022] — BIOLOGY STD 12 Science — Question

Why do pollen grains of some flowers trigger ‘sneezing’ in some people?

A child has low BMR, delayed puberty and mental retardation. Identify the disease.

State a reason for the increased population of dark coloured moths coinciding with the loss of lichens (on tree barks) during industrialisation period in England.

Name any two types of cells which act as ‘Cellular barriers’ to provide Innate Immunity in humans.

Cleistogamy can favour only autogamy. Justify.

APP proteins

What is protoplast?

Name the following: Enzyme involved in replacement of gaps in eukaryotes.

What is a dihybrid cross?

Mention the scientific term used for modified form of reproduction in which seeds are formed without fusion of gametes.