List of practice Questions

Rearrange the following parts into a meaningful sentence:
P: is one of the most valuable skills
Q: being able to communicate clearly
R: in both personal and professional life
S: a person can develop

What comes next in the series? 
\(2, 6, 12, 20, 30, \ ?\)

The RNA triplet UAG acts as a stop codon which terminates the synthesis of a polypeptide. Below is given a strand of DNA which codes for four amino acids.
In which position will an insertion of a thymine nucleotide result in the termination of translation?
DNA strand:
3′ T C C A C C C G A T G C 5′

Read the passage given below and answer the question. 
Food chains ‘P’ and ‘Q’ form an interconnection. ‘P’ initiates with wheat grass whose population supports a few grasshoppers, frogs and snakes. 
‘Q’ starts with dead decaying leaves of wheat grass which are eaten by earthworms and then food chain is continued with frog of food chain ‘P’. 
Identify the types of food chains ‘P’ and ‘Q’:

Student to attempt either option (A) or (B): (A) What is meant by ‘right’ and ‘wrong’ type of pollen when pollen lands on the stigma? A two-celled right type pollen has landed on the stigma. Explain the events taking place till fertilization in angiosperms. Why is pollen pistil interaction said to be dynamic?
OR
(B)
  • Give the schematic representation of oogenesis in human females indicating chromosome number at each step.
  • In which part of the female reproductive system do the following events take place?
    • I. Formation of corpus luteum
    • II. Maturation of tertiary follicle
    • III. Fertilisation
    • IV. Implantation
A person is suffering from high grade fever. Which symptoms will help to identify if he/she is suffering from Typhoid, Pneumonia or Malaria?
  • Why are transgenic animals so called?
  • With the help of an example each, explain the role of transgenic animals in the following:
    • [(i)] Vaccine safety
    • [(ii)] Biological products
(a) “The process of evolution of different species in a given geographical area starts from a point and literally radiates to other geographical areas.” Explain it with an example.
(b) Cite an example where more than one adaptive radiation has occurred in an isolated geographical area. Name the type of evolution your example depicts.
Student to attempt either option (A) or (B): (A) How is DNA isolated in purified form from a bacterial cell?
OR
(B) Explain how human functional insulin was produced by using recombinant DNA (rDNA) technology.
Assertion (A): A piece of DNA inserted into an alien organism generally does not replicate, if not inserted into a chromosome.
Reason (R): \textit{Chromosomes have specific sequences called ‘ori’ region, where DNA replication is initiated.
Assertion (A): Swiss cheese is characterized by large holes due to CO2 production.
Reason (R): It is ripened by growing a specific fungi.
Gene therapy can be used to treat an ADA deficient patient. Explain.
Is it a permanent cure? How can ADA be cured permanently?
Student to attempt either option (A) or (B): (A) Ravi lives in a village where he suggested to the local farmers to introduce a fungus as biofertilizer into their crop fields. State the benefits provided by the fungus to the crop.
OR
(B)
  • [(i)] How do secondary lymphoid organs provide immunity?
  • [(ii)] Highlight the role of spleen as an organ that provides immunity.

Construct and label a transcription unit from which the RNA segment given below has been transcribed. Write the complete name of the enzyme that transcribed this RNA.

Study the items of columns I and II where drugs and their effects are given and match them correctly.

Choose the correct answer from the options given below:

Choose the option that correctly describes the gynoecium of \textit{Michelia:
Assertion (A): A male individual always inherits haemophilia from his mother.
Reason (R): The gene for haemophilia lies on X-chromosome.
Identify the incorrect statement regarding PCR.
Assertion (A): Biotechnology produces transgenic microorganisms that function as microfactories for proteins.
Reason (R): Transgenic microorganisms can be developed to produce proteins of human use, like insulin.

In a certain population, the frequency of three genotypes is as follows:
Genotypes: PP Pp  pp 
Frequency: 22%  62%  16% 
Choose the option that shows the frequency of P and p alleles correctly:

Penetration of the sperm in the ovum is followed by:
India has only 2.4% of the world's land area but its share of the global species diversity is:
Which one of the following is not the product of transgenic experiments?
Which of the following conditions correctly describes the manner of determining the sex in the given options?
The number of all five-letter words (with or without meaning) having at least one repeated letter that can be formed by using the letters of the word INCONVENIENCE is: