List of practice Questions

(a) Why is “in vitro fertilization (IVF)” so named? State its importance.
(b) Distinguish between GIFT and ZIFT.
(a) (i) Write the karyotype and the genetic disorder of an individual who has developed from a zygote formed from an ‘XX’ egg fertilized by a ‘Y’ sperm.
(ii) Mention any two symptoms of this genetic disorder.
(iii) Write the possible reason that leads to the formation of this ‘XX’ egg.
OR
(b) In case of any dispute, a very small sample of tissue or even a drop of blood can help us to determine the paternity of a child. Provide a scientific explanation to substantiate the statement.
(a) Explain the process by which amino acid gets attached to the tRNA molecule during translation process.
(b) How does the translation process get terminated?
(c) Expand ‘UTR’. Where are they located?
Assertion (A): Loss of biodiversity can occur due to overexploitation of resources.
Reason (R): Introduction of Clarias gariepinus in Indian rivers has led to a decline in native Indian fishes.
(a) Name any two copper releasing intra-uterine devices. State two reasons that make them effective contraceptives.
(b) Name any two outbreeding devices that flowering plants have developed and explain how they help in encouraging cross-pollination.
Although Hemophilia and sickle cell anemia are two blood-related Mendelian disorders, yet they differ in their pattern of inheritance. State any two differences.
The pyramid of biomass in the sea is generally inverted because in the sea:
Assertion (A): RNA is unstable and can mutate at a faster rate.
Reason (R): The presence of 2’-OH group in every nucleotide of RNA makes it labile and easily degradable.
Assertion (A): Virus-infected cells produce interferons.
Reason (R): Interferons can cause inflammation of virus-infected cells.
Assertion (A): Specific enzymes are used to degrade the cell wall in organisms to isolate the DNA from the cell.
Reason (R): Fungal cell wall is degraded by the enzyme cellulase.
A woman with normal vision has a colour blind father. She marries a man with normal vision. The percentage chance of their progeny being colour blind is:
The vector for dengue fever is:
Which one of the following pairs is not correctly matched?
Which one of the following is not a feature of plasmids?
In a ’transcription unit’, the ’terminator’ is located towards the:
A population is in genetic equilibrium/Hardy-Weinberg equilibrium for a gene with 2 alleles (dominant allele is ‘A’ and recessive allele ‘a’). If the frequency of allele ‘A’ is 0.6, then the frequency of genotype ‘Aa’ is:
In the double helical structure of DNA molecule, the strands are:
In humans, the secondary oocyte completes meiotic division when:
Which one of the following statements is not true?
An angiosperm embryo sac is located within the:
Which of the following is a polar molecule?
In a diode, the reverse current is practically not dependent on the applied voltage.
A thin spherical shell of radius \( R \) has a uniform surface charge density \( \rho \). Using Gauss' law, deduce an expression for the electric field:
(i) Outside the shell.
(ii) Inside the shell.
A plane light wave propagating from a rarer into a denser medium, is incident at an angle \( i \) on the surface separating two media. Using Huygen’s principle, draw the refracted wave and hence verify Snell’s law of refraction.
In a Young’s double slit experiment, the slits are separated by 0.30 mm and the screen is kept 1.5 m away. The wavelength of light used is 600 nm. Calculate the distance between the central bright fringe and the 4thx dark fringe.