PUC Science 2nd PUC Class 12 - Karnataka Board PUC Question Bank Solutions for Biology

Write the function of RNA polymerase II.

Explain the ovarian and uterine events that occur during a menstrual cycle in a human female under the influence of pituitary and ovarian hormones respectively.

Choose the correct answer from the four options given below : 
 On which day of the menstrual cycle does ovulation take place ?

What is the bagging technique?

"Man can be a primary as well as a secondary consumer." Justify this statement.

Suggest two advantages to a farmer for using apomictic seeds of hybrid varieties.

Name the greenhouse gases that contribute to global warming.

Suggest a method to ensure an anamnestic response in humans.

Which one of the following is the most accurate definition of the term ‘health’?

Arrange the following hormones in sequence of their secretion in a pregnant woman. 

hCG, LH, FSH, Relaxin

Why did T. H. Morgan select Drosophila melanogaster to study sex linked genes for his lab experiments ?

Choose the correct answer from the four options given below : 
In a human male, a sperm will contain : 

Explain the process of transcription in Eukaryotes.

Why does endosperm development precede embryo development in angiosperm seeds?

A group of youth were having a ‘rave party’ in an isolated area and was raided by police. Packets of ‘smack’ and syringes with needles were found littered around.

1. Why is taking ‘smack’ considered an abuse?
2. Write the chemical name of ‘smack’ and the name of its source plant.
3. Syringes and needles used by the youth for taking the drug could prove to be very fatal. Why?

You have attended a birthday party hosted by one of your classmates. You found some guests at the party sitting in a corner making a lot of noise and consuming 'something'. After a while one of the boys from the group started screaming, behaving abnormally and sweating profusely. On enquiry you found that the group members were taking drugs.

(a) Would you inform your parents/school authorities ? Yes/No. Give reasons in support of your answer.

(b) Prepare a note to be circulated amongst the schoolmates about the sources and dangers of any two drugs.

(c) Write any two ways that you will suggest to your school principal so as to promote awareness amongst the youth against the use of these drugs.

How does a degenerate code differ from an unambiguous one?

Under polio prevention programme, infants in India were given polio vaccines on a large scale at regular intervals to eradicate polio from the country.

(a) What is a vaccine? Explain how does it impart immunity to the child against the disease.
(b) With the help of an example each, differentiate between active and passive immunity.