Human Reproduction — BIOLOGY STD 12 Science — Question

What is urethral meatus?

What do you understand by connecting Link? Explain their importance in biological evolution by giving suitable examples.

What do you mean by reproductive health? Mention the different ways in which people are made aware of the significance of reproductively healthy society.

DNA separated from one cell, when introduced into another cell is able to bestow some of the properties of former to the latter. What is this change called in technical terms? Describe the experimental evidences which led to the discovery of the above phenomenon.

What way the advent of the birth-control pill have resulted in an increase in STDs?

Your school has been selected by the Department of Education to organise and host an interschool seminar on "Reproductive Health - Problems and Practices". However, many parents are reluctant to permit their wards to attend it. Their argument is that the topic is "too embarrassing."
Put forth four arguments with appropriate reasons and explanation to justify the topic to be very essential and timely.

Identify by giving reasons, the salient features of genetic code by studying the following nucleotide sequence of mRNA strand and the polypeptide translated from it.
(AUG UUU UCU UUU UUU UCU UAG) (Met - Phe - Ser - Phe - Phe - Ser)

Comment on the following figures: 1, 2 and 3:
A, B, C, D, G, P, Q, R, S are species.

Differentiate between benign tumor and malignant tumor.

Study the age pyramids ‘A’, ‘B’ and ‘C’ of the human population given below and answer the questions that follow:

1. Identify pyramids ‘B’ and ‘C’.
2. Write the basis on which the above pyramids are plotted.