List of top Biology Questions

When the margins of sepals or petals overlap one another without any particular direction, the condition is termed as

At which stage of HIV infection does one usually show symptoms of AIDS?

Forelimbs of cat, lizard used in walking; forelimbs of whale used in swimming and forelimbs of bats used in flying are an example of:

Which one of the following are analogous structures?

How do parasympathetic neural signals affect the working of the heart?

Which structures perform the function of mitochondria in bacteria?

You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?

Just as a person moving from Delhi to Shimla to escape the heat for the duration of hot summer, thousands of migratory birds from Siberia and other extremely cold northern regions move to:

An example of ex situ conservation is:

The solid linear cytoskeletal elements having a diameter of 6 nm and made up of a single type of monomer are known as:

Fruit colour in squash is an example of:

Transformation was discovered by

Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (A-D). Identify the blanks.

The main function of mammalian corpus luteum is to produce:

Commonly used vectors for human genome sequencing are:

Which vector can clone only a small fragment of DNA?

To obtain virus-free healthy plants from a diseased one by tissue culture technique, which part/parts of the diseased plant will be taken?

Stimulation of a muscle fibre by a motor neuron occurs at

Select the correct option.

Direction of RNA synthesis		Direction of reading of the template DNA strand
(1)	3' — 5'	5' — 3'
(2)	5' — 3'	5' — 3'
(3)	3' — 5'	3' — 5'
(4)	5' — 3'	3' — 5'

Which one of the following shows isogamy with non-flagellated gametes?

Person with blood group AB is considered as universal recipient because he has:

Which of the following is a hormone releasing Intra Uterine Device (IUD)?