Environmental Issues — BIOLOGY STD 12 Science — Question

Draw a diagram of transverse section of an angiospermic anther. Label any six parts.

What will happen to an ecosystem if:
All top carnivore population is removed.

Fed up of a large family, a couple wanted to adopt a terminal method of contraception. Describe the process conducted by the doctor in either of the cases-male/ female partner.

How e-wastes are being handled in our country? Write the correct solution for treating this waste.

The epithelial lining of the human intestine is considered a secondary lymphoid organ. Prove the validity of the statement.

Explain the work carried out by Cohen and Boyer that contributed immensely in biotechnology.

Name the type of immunity a baby is born with. How is it different from the one he gets from the mother’s milk after birth?

Following is the DNA sequence representing a part of the gene:
TAC CCC CAC GAG TTA TAT ATA CGG GGG CAT CAT ATG From it derive

1. The RNA transcript
2. The spliced mRNA (assuming that all codons containing a C represent the intron)
3. The number of amino acids it can code for

What is the role of filiform apparatus?

Give a scientific term for the following sentences:

1. Total number of individuals of a species in an area.
2. A surgical procedure performed on males in which the vas deferens are cut and tied is known as:
3. A contraceptive device consisting of a small thimble-shaped cup that is placed over the uterus to prevent the entrance of spermatozoa.
4. Removal of gonads, often referring to the removal of male testes is called.