Biotechnology: Principles and Processes — BIOLOGY STD 12 Science — Question

When and where was the Earth Summit held? What was its objective?

Describe the termination process of transcription in bacteria.

Explain two situations, when independent assortment of genes occur, resulting in 50% recombinants.

Name the blank spaces a, b, c and d in the table given below:

S. No.	Name of the drug	Plant source	Organ system affected
(i)	a	Poppy plant	b
(ii)	Marijuana	c	d

The male fruit fly and female fowl are heterogametic while the female fruit fly and the male fowl are homogametic. Why are they called so?

Why do people suffer from altitude sickness after reaching the high altitude regions? How does their body acclimatised after a couple of days?

Shark is eurythermal while polar bear is stenothermal. What is the advantage the former has and what is the constraint the later has?

How is the presently occurring species extinction different from the earlier mass extinctions?

What are the differences between homologous and analogous organs? Explain with example.###Explain the homologous and analogous organ with example.###Explain homology and analogy in animals by giving example.

Identify the odd one out in each of the following sets:

1. Rete testis, vas deferens, isthmus, epididymis.
2. Seminal vesicles, ampulla, prostate, bulbourethral glands.