Environmental Issues — BIOLOGY STD 12 Science — Question

Evidences that evolution of life forms has indeed taken place come from many quarters. Name any four branches of biology that support or provide evidence for organic evolution.

Mention the advantages of selecting pea plant for experiment by Mendel.

Why do people suffer from altitude sickness after reaching the high altitude regions? How does their body get acclimatized after a couple of days?

List the events that lead to biogas production from waste water whose BOD has been reduced significantly.

Which fermentation conditions are necessary to be maintained during the production of biogas?

Which chromosome carries the mutated gene causing β–thalassemia? What are the problems caused by the mutation?

Enlist the characters that breeders have tried to incorporate into crop plants

Where are B-cells and T-cells formed? How do they differ from each other?

What is cleavage?

Differentiate between codons and anticodons.