List of top Biology Questions

Cell $A$ has osmotic potential of - $18$ bars and pressure potential of $8$ bars, whereas, cell $B$ has osmotic potential of - $14$ bars and pressure potential $2$ bars. The direction of flow of water will be

The two critical steps in the evolution of humans were the

In which of the following patterns of viral replication, viruses enter a cell, replicate and then cause the cell to burst, releasing new viruses?

Pythons possess tiny leg bones that serve no purpose in locomotion. Such organs are

Which of the following hormones is secreted by implanted blastocyst that acts on the corpus luteum in the ovary, stimulating the body to produce estrogens and progesterone to maintain the uterine lining?

This method of finding a gene is used when researchers know very little about the gene they are trying to find. This process results in a complete gene library: a collection of copies of DNA fragments that represent the entire genome of an organism.

Enzyme often have additional parts in their structures that are made up of molecules other than proteins. When this additional chemical part is an organic molecule, it is called

Genetically engineered bovine $(bST)$, sometimes called $rbST$ (recombinant bovine somatotropin) or $rbGH$ (recombinant bovine growth hormone) are used in the

Animals possess nerve networks or nervous systems to respond to their environment. But the single called Amoeba does not possesses any nerve cell, so, how it come to know whether a particle it encounters is a grain of sand and not its dinner ?

A gamete may carry either of the traits but not both. This is Mendel?? second law or law of independent assortment.

Darwin's finches provide excellent evidence in favour of organic evolution. These are related to which of the following evidences?

Which one of the following is correct pairing of a body part with the kind of muscle tissue present in it?

Global agreement in specific control strategies to reduce the release of ozone depleting substances was adopted by

Chipko movement was launched for the protection of

Biochemical oxygen demand (BOD) in a river water

The presence of tube feet is a characteristic feature of the phylum

Which one of the following is not air pollutant ?

Consider the following statements and choose the correct option. (I) The genetic constitution of a plant is unaffected in vegetative propagation. (II) Rhizome in ginger serves as an organ of vegetative reproduction. (III) Totipotency of cells enables us to micropropagate plants.

$DDT$ residues are rapidly passed through food chain causing biomagnification because $DDT$ is

Which insecticide is more hazardous to human health ?

Branch of zoology dealing with the study of fishes is called

The width of DNA molecule is

A monocarpic plant is one which

Lowest or basic unit of classification is

Plasmids are extra chromosomal genetic material of