Reproductive Health — BIOLOGY STD 12 Science — Question

Construct and label a transcription unit from which the RNA segment given below has been transcribed. Write the complete name of the enzyme that transcribed this RNA.

Discuss the mode of action and advantages/ disadvantages of hormonal contraceptives.

Write any four ways used to introduce a desired DNA segment into a bacterial cell in recombinant DNA technology experiments.

Describe the endosperm development in angiosperms.

1. Write your observations on the variations seen in the Darwin’s finches shown above.
2. How did Darwin explain the existence of different varieties of finches on Galapagos Islands?

What are biofertilizers? Name the two elements which are made available by them.

Anita was happy when she gave birth to her first child. Her in-laws were dissatisfied at her not giving birth to a male child and blamed Anita. Anita tried to convince her in-laws that she had no role in the child's gender. They understood the biological reason but were yet to be satisfied. Anita's husband took up the matter and convinced the parents.
i. What values did Anita's husband show in the above situation?
ii. What governs sex determination in humans? How is it different from birds?
iii. Why can't Anita be blamed for not giving birth to a male child?

1. Identify (A) and (B) illustrations in the following:

1.  

2.  

2. Write the term given to (A) and (C) and why?
3. Expand PCR. Mention its importance in biotechnology.

Give the name and character of the disease caused by Antamoeba histolytica, Trichophyton and wucheria in human.

Explain the process of charging of RNA. Why is it essential in translation?