List of top Biology Questions

Explain brood parasitism with the help of a suitable example.

Why is an early detection of these diseases essential?

Draw a schematic diagram of the \textit{E.coli vector pBR 322 and mark the following in it:}
(a) ori
(b) rop
(c) ampicillin resistant gene
(d) tetracycline-resistant gene
(e) restriction site Bam HI
(f) restriction site EcoRI

Biodiversity hotspots cover less than 2\% of Earth’s land area. Strict protection of these areas can reduce the rate of ongoing extinctions. Explain.

Differentiate between grazing food chain and detritus food chain.

Mention any two ways by which HIV and Hepatitis-B can be transmitted to a healthy person.

Assertion (A): Patents are granted by the government to an inventor.
Reason (R): Patents prevent others from commercial use of an invention.

Name the first developed transgenic cow.

Study the graph given below that represents the changes in the thickening of the uterine wall in women ‘X’ and women ‘Y’ over a period of one month: \textit{(Refer to the provided graph.)}
What does the graph with respect to woman ‘X’ and woman ‘Y’ indicate? Give a suitable reason.

Assertion (A): Some aquatic ecosystems have inverted biomass pyramids.
Reason (R): More energy is required by the organisms occupying higher trophic levels.

Assertion (A): A given fig species can be pollinated only by its partner wasp.
Reason (R): The wasp pollinates the fig inflorescence while searching for suitable egg-laying sites.

Explain the improvement in the quality of the milk produced by it.

The commonly used vector for human genome sequencing was/were:

Select the option that gives the correct identification of ovum, morula, and blastocyst in a human female reproduction system as shown in the following diagram: \textit{(Refer to the provided diagram.)}

Assertion (A): Plasmids are autonomously replicating circular extra-chromosomal DNA.
Reason (R): Plasmids are usually present in eukaryotic cells.

ELISA technique is based on the principle of:

The ‘molecular scissors’ fall in the category of:

Turner’s syndrome in humans occurs due to:

Study the table given below: \begin{center} \begin{tabular}{|c|l|l|} \hline Contraceptive & Mode of Action
\hline A. The pill & I. Prevent sperm reaching cervix
B. Condom & II. Prevent implantation
C. Vasectomy & III. Inhibits ovulation
D. Copper-T & IV. Semen contains no sperm
\hline \end{tabular} \end{center} Select the option where contraceptive/contraceptive method are correctly matched with their mode of action:

Study the following diagram of Transverse Section of a young anther of an angiosperm:
\textit{(Refer to the provided diagram)}
Select the option where parts ‘A’, ‘B’, and ‘C’ are correctly identified.

Hugo de Vries proposed the mutation theory of organic evolution after his experiments on:

Which of the options has correct identification of ‘P’, ‘Q’, and ‘R’ in the illustration of ‘Central Dogma’ given below?

Identify the category of genetic disorder depicted in the pedigree chart given below:

A list of organisms is given in column ‘R’, whereas in column ‘S’ a list of products produced by them: \begin{center} \begin{tabular}{|c|c|} \hline Column ‘R’ (Organisms) & Column ‘S’ (Products)
\hline \textit{Lactobacillus} & Cheese
\hline \textit{Saccharomyces cerevisiae} & Curd
\hline \textit{Aspergillus niger} & Citric acid
\hline \textit{Acetobacter aceti} & Acetic acid
\hline \end{tabular} \end{center} Select the option where the organisms are correctly matched with the product:

In a fertilized ovule of an angiosperm, the cells in which \(n\), \(2n\), and \(3n\) conditions respectively occur are: