List of top Biology Questions asked in Maharashtra Board Class XII Exam

Describe outbreeding devices which encourage cross pollination.
Explain the properties of nerve fibres.
Give the applications of DNA fingerprinting.
Give the causative agent, mode of transmission and symptoms of typhoid.
With the help of neat and labelled diagrams, distinguish between artery and vein.
State the names of hormone and glands secreting them:
Give the adaptations shown by desert animals.
What is ecological succession? Name various seral stages from pioneer species to climax community with suitable example in hydrarch succession.
Describe physiological effect and applications of gaseous hormone in plants.

Complete the following flow diagram of double circulation:

Distinguish between hyperthyroidism and hypothyroidism.
With the help of a neat, labelled diagram describe the structure of root hair.
Explain natural selection with example of industrial melanism.
What are the effects of biotechnology with relation to human health?
Write the aims of human genome project.
Enlist the characteristics of Neanderthal Man.
A person met with a small accident and bleeds, but very soon stops bleeding. Explain the physiological process responsible for this.
Abscissic acid is the common name given to two identical substances isolated separately. Name them. Give the chemical features of abscissic acid.
Define the following: (a) Gravitational water, (b) Hygroscopic water, (c) Combined water, (d) Capillary water
Give different properties of water.
Identify chromosomal disorder caused due to non-disjunction of 21st number of chromosome and enlist its symptoms.
How many Biodiversity hotspots have been identified around the world?

From the given diagram, identify the type of population growth curve:

What do you mean by Pioneer species?
Name the cell which is responsible for nitrogen fixation in cyanobacteria.