Which of the following is a barrier method of contraception?

Which of the following is TRUE for gel electrophoresis ?

Arrange the following steps of Polymerase Chain Reaction in correct sequence.
A. Annealing of Primer
B. Denaturation of dsDNA
C. Extension of Primer
D. Amplification
Choose the correct answer from the options given below:

Read the passage carefully and answer the questions based on the passage:
Pollen pistil interaction involves all events from the landing of pollen grains on the stigma until the pollen tube enters the embryo sac (when the pollen is compatible). When a pollen tube grows through the style and enters into the ovules, it finally discharges two male gametes in one of the synergids. Syngamy and triple fusion are two fusion events occur in angiosperms. Thus, angiosperms exhibit double fertilization. The products of these fusions are the diploid zygote and triploid primary endosperm nucleus. Zygote develops into embryo and primary endosperm cell forms the endosperm tissue. The developing embryo passes through different stages before maturation.
Formation of diploid zygote is a result of:

A single stranded DNA or RNA tagged with a radioactive probe is allowed to hybridize to its complementary DNA in a clone of cells followed by detection using __________.

The stain commonly used to visualise DNA fragments separated by gel electrophoresis is:

Match List - I with List - II.

LIST I (Causal Agent)	LIST II (Disease)
(A) Salmonella typhi	(I) Typhoid
(B) Streptococcus pneumoniae	(II) Pneumonia
(C) Rhino Viruses	(III) Common cold
(D) Plasmodium	(IV) Malaria

Choose the correct answer from the options given below:

A simple random sample consists of four observations 1, 3, 5, 7. The point estimate of population standard deviation is :

Amniocentesis should not be used for:

The displacements of four light waves are given below. If the amplitudes \( a_1 \) and \( a_2 \) are nearly equal, then the interference fringes may be observed due to superposition of:
(A) \( y = a_1 \sin \omega t \)
(B) \( y = a_2 \sin (\omega t + \phi) \)
(C) \( y = a_1 \sin 2\omega t \)
(D) \( y = a_2 \sin 3(\omega t + \phi) \)

Fruits develop without fertilization in few species, the process is called:

Which one of the following step is not involved in the genetic modification of an organism?

The ratio of speed of light in vacuum to the speed of light in a medium is :
Where \(\mu_{ r }=\) relative permeability of the medium,\(\epsilon_{ r }=\) relative permittivity of the medium