Biodiversity and Conservation — BIOLOGY STD 12 Science — Question

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

A and B are the two different cloning vectors in two different bacterial colonies cultured in chromogenic substrate, Bacterial colonies with cloning vector A were colourless, whereas those with B were bluecoloured. Explain giving reasons the cause of the difference in colour that appeared.

Explain the steps that ensure cross pollination in an autogamous flower.

What are the functions of placenta?

List the specific symptoms of amoebiasis. Name the causative organism.

What is the effect of radiation pollution of humans?

During the secondary treatment of the primary effluent, how does the significant decrease in BOD occur?

Inheritance is particulate in nature. Justify.

Describe briefly the following:
Downstream processing

Two independent monohybrid crosses were carried out involving a tall pea plant with a dwarf pea plant. In the first cross, the offspring population had equal number of tall and dwarf plants, whereas in the second cross it was different. Work out the crosses, and explain giving reasons for the difference in the offspring populations.

OR

Work out a cross to find the genotype of a tall pea plant. Name the type of cross.