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

How would you explain to the farmers that apiculture is both easy and economically beneficial to them?

Answer the following questions:
Name two intrauterine contraceptive devices that affect the motility of sperms.

Answer the following questions:
How would the following affect the phenomenon of independent assortment?

1. Crossing over.
2. Linkage.

1. Can a plant flowering in Mumbai be pollinated by pollen grains of the same species growing in New Delhi? Provide explanations to your answer.
2. Draw the diagram of a pistil where pollination has successfully occurred. Label the parts involved in reaching the male gametes to its desired destination.

Name the source of gonadotropins in human females. Explain the changes brought about in the ovary by these hormones during menstrual cycle.
OR
Describe how the changing levels of FSH, LH and progesterone during menstrual cycle induce changes in the ovary and the uterus in human female.

Answer the following question based on the figures given below:

1. What do S and P denote?
2. Name the parts from Which they do develop?
3. What is the term given to the point of attachment of the ovules in the fruit?
4. What is the ploidy of embryo and the tissues in the ovary?
5. What is the function of pericarp in fruit?

A burglar in a huff forgot to wipe off his blood-stains from the place of crime where he was involved in a theft and fight. Name the technique which can help in identifying the burglar from the blood-stains. Describe the technique.

How are assisted reproductive technologies helpful to humans? How are ZIFT and GIFT different from intrauterine transfers? Explain.

Define Parthenogenesis. Give two examples.

What is meant by traditional knowledge? What is its importance?