Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

The figure given below shows the relative contribution of four greenhouse gases to global warming.

1. Identify the gases A and C.
2. Why are these four gases called greenhouse gases?

Give the chromosomal constitution and the resulting sex in each of the following syndromes:
Klinefelter’s syndrome.

While holding a tea cup Mr. Kothari’s hands rattle. Which disorder he may be suffering from and what is the reason for this?

Why are e-wastes recycled in the developing countries? What is the problem associated with it?

What are we referring to when we say 'simple organisms' or 'complex organisms'?

Bacteria cannot be seen with the naked eyes, but these can be seen with the help of a microscope. If you have to carry a sample from your home to your biology laboratory to demonstrate the presence of microbes under a microscope, which sample would you carry and why?

What are interferons? How do they help in developing resistance to infection?

What are the functions of DNA polymerase?

Name the ancestors of man based on the features given below:

1. Human-like meat eater with 900cc brain, lived in Java.
2. More human with brain size 1400cc, lived in Central Asia, used hides and buried their dead.
3. Human-like, vegetarian, with brain capacity between 650cc and 800cc.
4. Man-like primate, that existed about 15 mya. Fossils found in Tanzania.

Write the most important characteristic that Aspergillus niger, Clostridium butylicum, and Lactobacillus share.