Construct an age pyramid which reflects an expanding growth stat

Subject

Biology

Class

CBSE Class 12

Pre Boards

Practice to excel and get familiar with the paper pattern and the type of questions. Check you answers with answer keys provided.

Sample Papers

Download the PDF Sample Papers Free for off line practice and view the Solutions online.
Advertisement

 Multiple Choice QuestionsShort Answer Type

11.

With the help of one example, explain the phenomena of co-dominance and multiple allelism in human population.

1007 Views

12.

Write the scientific name of the fruit-fly. Why did Morgan prefer to work with fruit-flies for his experiments? State any three reasons.

540 Views

13.

Linkage or crossing-over of genes are alternatives of each other. Justify with the help of an example.

1711 Views

14.

List the symptoms of Ascariasis. How does a healthy person acquire this infection?

532 Views

Advertisement
15.

Explain the significant role of the genus Nucleopolyhedrovirus in an ecological sensitive area.

565 Views

16.

How does a restriction nuclease function? Explain.

729 Views

17.

How have transgenic animals proved to be beneficial in:
(a) Production of biological products
(b)Chemical safety testing.

594 Views

18.

Describe the mutual relationship between fig tree and wasp and comment on the phenomenon that operates in their relationship.

558 Views

Advertisement
Advertisement

19.

Construct an age pyramid which reflects an expanding growth status of human population.


The age pyramid reflects an expanding growth status of human population as the number of individuals in the post reproductive stage is lower than the Reproductive and the pre-reproductive stage.

497 Views

Advertisement
20.

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

1260 Views

Advertisement