Reproduction in Lower and Higher Plants — BIOLOGY STD 12 Science — Question

Attachment of embryo to the wall of the uterus is known as ……………….

Select the right match of endocrine gland and their hormones among the options given below.
A. Pineal i. Epinephrine
B. Thyroid ii. Melatonin
C. Ovary iii. Estrogen
D. Adrenal medulla iv. Tetraiodothyronine

Which of the following can make you ill, if you come in contact with an infected person?

Where does the ovum receive the sperm?

How many meiotic divisions will be needed to produce 44 female gametophytes in angiosperms?

The slow rate of decomposition of fallen logs in nature is due to their

A large number of married couples the world over are childless. It is shocking to know that in India the female partner is often blamed for the couple being childless.

1. Why in your opinion the female partner is often blamed for such situations in India? Mention any two values that you as a biology student can promote to check this social evil.
2. State any two reasons responsible for the cause of infertility.
3. Suggest a technique that can help the couple to have a child where the problem is with the male partner.

Function of restriction endonuclease enzyme is :

Diploid chromosome number in humans is:

"It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanisms for the genetic material," this is written by: