Human Reproduction — BIOLOGY STD 12 Science — Question

Name the placental mammals corresponding to the Australian 'spotted cuscus' and Tasmanian 'tiger cat', which have evolved as a result of convergent evolution.

Expand CAM.

A DNA molecule in which both strands have radioactive thymidine is allowed to duplicate in an environment containing non-radioactive thymidine. What will be the correct number of DNA molecule that contain some radioactive thymidine after 3 duplications?

Which of the following statements is true for Bryophyllum?

1. Germinating bud appears from the eye of the stem tuber.
2. Germinating bud appears from the node of the rhizome.
3. Germinating bud appears from the notch at the leaf margin.

What is Amrita Devi Bishnoi Wildlife Protection Award given for?

Give two examples of extinction caused by indiscriminate hunting.

Why do we add an inoculum of curd to milk for curdling it?
OR
Why is 'starter' added to set the milk into curd? Explain.

OR
During the production of curd, a small amount of curd is added as a starter to the fresh milk at a suitable temperature. Explain the changes the milk undergoes when it sets into the curd.

OR
Why is a little curd added to milk to set it into curd? Explain.

Name the toxin responsible for the appearance of symptoms of malaria in human. Why do these symptoms occurs periodically?OR
How does haemozoin affects the human body when released in blood during malarial infection?

Why hnRNA is required to undergo splicing?

Provide an example of each of single-celled organisms, which reproduce by:

1. Binary fission.
2. Budding.