Human Reproduction — BIOLOGY STD 12 Science — Question

Write any four ways used to introduce a desired DNA segment into a bacterial cell in recombinant DNA technology experiments.

Name the genus to which baculoviruses belong. Describe their role in the integrated pest management programmes.

Ornithologists observed decline in the bird population in an area near a lake after the setting of an industrial unit in the same area. Explain the cause responsible for the decline observed.

Write the important functions of various reproductive organs of human female.

Kishor visited his village and saw some trees on the boundary of the agricultural field. He thought that these are for partioning the land and discussed the matter with his grandfather. His grandfather explained him the utility of trees to the farmers and the farmlands.

1. What are the benefits these trees impart to the farmland?
2. What are such trees called?

State any three methods by which animals cope with the temporary unfavourable conditions in their habitat when they cannot migrate.

Answer the following questions:
How are pea seeds different from castor seeds with respect to endosperm?

Only asexual reproduction can give rise to individuals resembling their parent. Do you agree with the statement? Support your answer with an example.

What is Trophic level? Draw diagrammatic representation of trophic levels in ecosystem.

The below image shows is the headquarter of Eli Lilly company. Eli lily is one of the first pharmaceutical companies to produce human insulin using RDT technology by cell-based fermentation method.

i. How did Eli Lilly synthesize human insulin?
ii. Mention one difference between this insulin and the one produce by the human pancreas.