Control and Co-ordination — BIOLOGY STD 12 Science — Question

No evidence was found on a crime scene, other than only a few hair strands. The inspector wants to proceed for DNA fingerprinting, but the amount of DNA is very less.

1. In your opinion what could be the solution to this problem?
2. Write the basic steps of this technique.
3. Name the scientist who developed this technique.
4. What values shown by the inspector?

The density of a population in a habitat per unit area is measured in different units. Write the unit of measurement against the following:

a.	Bacteria	____________
b.	Banyan	____________
c.	Deer	____________
d.	Fish	____________

1. Write the scientific names (binomials) of the causative organisms of pneumonia.
2. How does a healthy person acquire infection of this disease?
3. Mention the characteristic symptoms of the disease.

Explain the different ways of diagnosing cancer.

What is disruptive selection? Give example.

Mention their source and the function they perform:
hCG, LH, FSH, Relaxin.

Discuss the process of translation in detail.

Is it true that if the dissolved oxygen level drops to zero, the water will become septic. Give an example which could lower the dissolved oxygen content of an aquatic body.

Describe the post-zygotic events leading to implantation and placenta formation in humans. Mention any two functions of placenta.
OR

1. Briefly explain the events of fertilisation and implantation in an adult human female.
2. Comment on the role of placenta as an endocrine gland.

Which of the following ecosystems will be more productive in terms of primary productivity? Justify your answer.
A young forest, a natural old forest, a shallow polluted lake, alpine meadow.