HSC Science इयत्ता १२ - Tamil Nadu Board of Secondary Education Question Bank Solutions

Which of the following is correct regarding HIV, hepatitis B, gonorrhoea and trichomoniasis?

Which one of the following groups includes sexually transmitted diseases caused by bacteria only?

Identify the correct statements from the following.

Describe the major STDs and their symptoms.

How are STDs transmitted?

Write the preventive measures of STDs.

What are the applications of Karyotyping?

DNA and RNA are similar with respect to ____________.

What are the three structural differences between RNA and DNA?

Dolly, the sheep was obtained by a technique known as ____________.

The organization which published the red list of species is ____________.

Expand the acronym.

hPL

Correct the following statement.

Transfering of an embryo with more than 8 blastomeres into the uterus is called GIFT.

Expand the following.

 ZIFT

The procedure of GIFT involves the transfer of female gametes into the fallopian tube, can gametes be transferred to the uterus to achieve the same result? Explain.

Explain the formation of a nucleosome.

A population will not exist in Hardly Weiberg equilibrium if ____________.

How does Hardy-Weinberg’s expression (p²+2pq+q²=1) explain that genetic equilibrium is maintained in a population? List any four factors that can disturb the genetic equilibrium.

Explain how mutations, natural selection and genetic drift affect Hardy Weinberg equilibrium.

Explain why cloning of Dolly, the sheep was such a major scientific breakthrough?