List of top Biology Questions

Assertion (A): Gross primary productivity is always less than net primary productivity.
Reason (R): Rate of synthesis of organic matter by consumers is known as secondary productivity.
Assertion (A): Streptococcus pneumoniae} and Haemophilus influenzae} are responsible for causing infectious diseases in human beings.
Reason (R): A healthy person acquires the infection by inhaling the droplets/aerosols released by an infected person.
The population interaction where one species is harmed and the other is unaffected is:
Crystals of Bt toxin produced by some bacteria do not kill the bacteria producing them because:
The most primitive ancestor of humans is:
In plants, which one of the following helps in the absorption of phosphorus from soil?
The sequence that controls the copy number of linked DNA in the vector is termed:
Which one of the following codons has dual function?
The mosquito-borne disease in humans causing chronic inflammation of the lymphatic vessels is:
In humans, non-disjunction of the 21st pair of chromosomes leads to:
Amniocentesis is a technique that is used to:
Estrogen is secreted by:
Long ribbon-like pollen grains are seen in some:
What is the term used for the milk produced during the initial days of lactation?
Describe the changes in the ovary and the uterus as induced by the changes in the level of pituitary and ovarian hormones during menstrual cycle in a human female.
Explain why the milk produced by the mother during the initial days of lactation is considered to be very essential for the newborn infant.
In a dihybrid cross AaBb × AaBb, what percentage of offspring will show at least one recessive trait?
The plants showing: hypogynous flower, valvate aestivation, and tricarpellary ovary are:
In which group of algae are food materials stored in pyrenoids?
The number of ATP and NADPH molecules required respectively to synthesize one molecule of glucose in C\(_3\) plants is:
Which part of the human eye controls the amount of light entering it?
Which of the following statements about photosynthesis is correct?
Which plant hormone is responsible for apical dominance?
Which of the following would most likely occur in an ecosystem following the removal of a keystone species?
Which of the following statements is true regarding Mendel's law of independent assortment?