Human Health and Diseases — BIOLOGY STD 12 Science — Question

State any three benefits of Biofertilizers.

State Mendel’s principle of segregation.

Pioneer species.

It is commonly observed that parents feel embarrassed to discuss freely with their adolescent children about sexuality and reproduction. The result of this parental inhibition is that the children go astray sometimes.

1. Explain the reasons that you feel are behind such embarrassment amongst some parents to freely discuss such issues with their growing children.
2. By taking one example of a local plant and animal, how would you help these parents to overcome such inhibitions about reproduction and sexuality?

Write the mode of pollination in Vallisneria and water lily. Explain the mechanism of pollination in Vallisneria.

Enzymes play an important role in detergents that we use for washing clothes. These enzymes are obtained from some unique microorganisms, enlist atleast two of them. Also name the enzyme.

What are the requirements of bee keeping?

Water is very essential for life. Write any three features each for plants and animals, which enable them to survive in water scarce environment.

Draw a diagram of a mature human sperm. Label any three parts and write their functions.

Complete the following chart and rewrite

Hormones	Functions
1. Rapid regeneration of endometrium and maturation of Graafian follicle	————–
2. Secretion of endometrial glands and increased secretion of progesterone	————–
3. Breakdown of endometrium in absence of fertilization	————-