Evolution — BIOLOGY STD 12 Science — Question

Write the exponential equation for J-shaped growth form.

Why is the possibility of a human female suffering from haemophilia rare? Explain.

How do mammals living in colder regions and seals living in polar regions able to reduce the loss of their body heat?

Fulfillment of a, b, c and d in the table given below.

S.No.	Name of Drug	Plant source	Name of affected part
1	a	Popy plant	B
2	Marijuana	c	d

Mention the common bacterium found in the anaerobic sludge during sewage treatment and also in the rumen of cattle. How is this bacterium commercially useful?

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.

Why is a person with cuts and bruises following an accident administered tetanus antitoxin? Give reasons.

OR

Why does a doctor administer tetanus antitoxoid and not a tetanus vaccine to a child injured in a roadside accident with a bleeding wound? Explain.

Name the plant source of ganja. How does it affect the body of the abuser?

Explain the difference between homologous and analogous organs with examples.