Which of the following component was not the part of S.L. Miller's experiment?

Which of the following statements are correct about energy flow?
(A) Net primary productivity is available to consumers.
(B) Secondary productivity increases with each trophic level.
(C) The growth of the food chain is limited by the inefficiency of energy transfer.
(D) About 90% energy at one trophic level does not appear at the next level.
Choose the correct answer from the options given below:

Transgenic animals that produce useful biological products can be created by the introduction of the portion of DNA (or genes) which codes for a particular product such as human protein (α-1-antitrypsin). This protein is used to treat:

Sex chromosomes of female in chicken are:

Match List I with List II

LIST I	LIST II
A. Salmonella typhi	I. Common Cold
B. Rhino virus	II. Typhoid
C. Streptococcus pneumoniae	III. Malaria
D. Plasmodium vivax	IV. Pneumonia

Choose the correct answer from the options given below:

Recombinant DNA is directly injected into the nucleus of an animal cell. This method is known as-

Read the following paragraph carefully and answer the given questions.
In the year 1963 the two enzymes responsible for restricting the growth of bacteriophage in E. coli were isolated. The first restriction endonuclease - Hind II, whose functioning depended on a specific DNA nucleotide sequence was characterized five years later. It was found that Hind II always cut DNA molecules at a particular point by recognizing a specific sequence of six base pairs. This specific base sequence is known as the recognition sequence for Hind II. Besides Hind II, today we know more than 900 restriction enzymes that have been isolated from over 230 strains of bacteria, each of which recognize different recognition sequences.
DNA fragments can be separated by a technique known as:

Butanone is less reactive than propanal towards nucleophilic addition reaction because :

An equiconvex lens of focal length 20 cm in air is immersed in water of refractive index.
What is the percentage change in focal length of the lens? \(\left(\mu_w=\frac{4}{3}\right)\left(\mu_g=\frac{3}{2}\right)\)

Identify the features developed by flowering plants to discourage self-pollination:
(A) Self incompatibility
(B) Synchronized pollen release and stigma receptivity
(C) Different positions of anther and stigma in a flower
(D) Producing bisexual flowers
Choose the correct answer from the options given below:

If \(A=\left[\begin{array}{cc}\alpha & \beta \\ \gamma & -\alpha\end{array}\right]\) is such that \(A^2=I\), then:

Which of the following contribute to increase in population density?

In a typical test cross: