PUC Science 2nd PUC Class 12 - Karnataka Board PUC Important Questions

Describe the development of a fertilized ovum upto implantation.

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.

Differentiate between vas deferens and vasa efferentia.

Differentiate between spermatogenesis and spermiogenesis.

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

1. What precaution(s) would you recommend to a patient requiring repeated blood transfusion?
2. If the advise is not followed by the patient, there is an apprehension that the patient might contract a disease that would destroy the immune system of his/her body. Explain with the help of schematic diagram only how the immune system would get affected and destroyed.

Name the kind of diseases/disorders that are likely to occur in humans if
    (i) mutation in the gene that codes for an enzyme phenyl alanine hydrolase occurs,
    (ii) there is an extra copy of chromosome 21,
    (iii) the karyotype is XXY.

Mention any one symptom of the diseases/disorders named above.

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 : 

How does a degenerate code differ from an unambiguous one?

Write the function of RNA polymerase II.

Explain the process of transcription in Eukaryotes.

What role does an individual organism play as per Darwin's theory of natural selection?

Explain divergent evolution with two examples. 

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.

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.

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

How does the application of the fungal genus, Glomus, to the agricultural farm increase the farm output?