Biotechnology and its Applications — BIOLOGY STD 12 Science — Question

Name the interaction that exists between sucker fish and shark.

OR

Name the type of interaction that exists between barnacles and whale.

OR

Comment on the interaction between a clown fish living among the tentacles of a sea anemone.

Write the name of hormone responsible for milk synthesis after parturition.

Name the surgical methods of contraceptions.

Mark the odd one in the following group.
PCR, Widal, rDNA technology, ELISA.

How is the entry of only one sperm and not many ensured into an ovum during fertilisation in humans?

Mention how do bears escape from stressful time in winter.

Which law of inheritance of Mendel is universally acceptable and without any exception? State the law.

Two statements are given-one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.

1. Both assertion and reason are true and reason is the correct explanation of assertion.
2. Both assertion and reason are true but reason is not the correct explanation of assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

Assertion: Biopatents are awarded for biological entities and all products derived from them.
Reason: Patent on use of turmeric in wound healing was cancelled in 2008.

Write the phenotypic and genotypic ratio for dihybrid test cross?

Which type of cell division forms spermatids from the secondary spermatocytes?