List of top Biology Questions

A disease caused by an autosomal primary non- disjunction is:

Climax community is a state of:

Plants which produce characteristic pneumatophores and show vivipary belong to :

The decomposers in an ecosystem are ______

The pH of nutrient medium in plant tissue culture is adjusted between _____

The vascular cambium normally gives rise to

A decrease in blood pressure/volume will not cause the release of

Homozygous purelines in cattle can be obtained by

GnRH, a hypothalamic hormone, needed in reproduction, acts on

Which one of the following statements is not valid for aerosols?

Lungs are made up of air-filled sacs the alveoli. They do not collapse even after forceful expiration, because of:

Among the following characters, which one was not considered by Mendel in his experiments on pea?

Which one from those given below is the period for Mendel's hybridization experiments?

Good vision depends on adequate intake of carotene rich food.
Select the best option from the following statements:

1. Vitamin A derivatives are formed from carotene .
2. The photopigments are embedded in the membrane discs of the inner segment.
3. Retinal is a derivative of vitamin A.
4. Retinal is a light absorbing part of all the visual photopigments.

In Bougainvillea thorns are the modifications of

During DNA replication, Okazaki fragments are used to elongate

Which of the following options gives the correct sequence of events during mitosis?

Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen?

Which of the following are not polymeric?

The region of Biosphere Reserve which is legally protected and where no human activity is allowed is known as

Which one of the following statements is correct, with reference to enzymes?

The hepatic portal vein drains blood to liver from

Attractants and rewards are required for

Which cells of 'Crypts of Lieberkuhn' secrete antibacterial lysozyme?

Which of the following is made up of dead cells?