Evolution — BIOLOGY STD 12 Science — Question

Write any three goals of human genome project.

What is the role of cervix of the human female system in reproduction?

i. Why is the collection of white-winged moths and dark-winged moths made in England between 1850-1920 considered a good example of natural selection?
ii. Evolution is based on chance events in nature and chance mutations in organisms. Justify the statement.

Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination.

Name the pest that destroys the cotton bolls. Explain the role of Bacillus thuringiensis in protecting the cotton crop against the pest to increase the yield.

Mark the odd one the following groups.
Luteinizing hormone, Progesterone, Chorionic gonadotropin, Estrogen.

Parthenocarpy and apomixis have been observed in some plants. Give an example of each. State a similarity and a difference observed between the two processes.

Define biodiversity Name the two most biodiversity rich zones of India.

Apart from plants and animals, microbes form a permanent biotic component in an ecosystem. While plants have been referred to as autotrophs and animals as heterotrophs, what are microbes referred to as? How do the microbes fulfil their energy requirements?

Name the specific enzyme responsible for nucleotide polymerisation in DNA replication. Write two characteristic features of this enzyme. Name the region on E.coli DNA, where this enzyme can initiate replication.