Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Biology

Answer the following question.
Express the process of pollination in Vallisneria.

Differentiate between geitonogamy and xenogamy (allogamy).

Answer the following question.
Write the difference in the characteristics of the progeny produced as a result of the two processes.

Write two differences between Homo erectus and Homo habilis

Answer the following question.
List four benefits to human life by eliminating the use of CFC_s.

Can a plant flowering in Mumbai be pollinated by pollen grains of the same species growing in New Delhi? Provide explanations to your answer.

Answer the following question.
Write the characteristics of Ramapithecus, Dryopithecus, and Neanderthal man.

Coelacanth was caught in South Africa. State the significance of the discovery of Coelacanth in the evolutionary history of vertebrates.

1. Nucellus
2. Antipodals
3. Synergids
4. Micropyle

Autogamy can occur in a chasmogamous flower if ______.

Choose the correct statement from the following.

Wind pollination is common in ______.

From among the situations given below, choose the one that prevents both autogamy and geitonogamy.

A particular species of plant produces light, non-sticky pollen in large numbers and its stigmas are long and feathery. These modifications facilitate pollination by ______.

Cleistogamous flowers are ______.

Both chasmogamous and cleistogamous flowers are present in ______.

Pollination by water occurs in ______.

Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by ______.

A dioecious flowering plant prevents both ______.

Pollination occurs in ______.