List of top Biology Questions

Define the terms:
Genetic drift
Homologous organs
What is biofortification?
Mention one example each of fortification with reference to –
a. Amino acid content
b. Vitamin-C content
Define – Imbibition
Explain how imbibition helps root hairs in adsorption of water.
Draw a neat diagram of the conducting system of human heart and label AV node, Bundle of His, and Purkinje fibres.
What is ex-situ conservation?
Mention any two places where the ex-situ conservation is undertaken.
Draw a neat diagram of thyroid gland and label thyroid follicle, follicular cells, and blood capillaries.
A child has low BMR, delayed puberty and mental retardation. Identify the disease.

Identify ‘A’ in the given graph of population growth.

Define the terms:
a. Gross Primary Productivity
b. Net Primary Productivity
Give reason – ABA is also known as antitranspirant.
Explain the role of chlorophyllase enzyme in banana.
Complete the following box with reference to symptoms of mineral deficiency:
Abscission: Pre-mature fall of flowers, fruits and leaves
______: Appearance of green and non-green patches on leaves
Give an example of plant having both kidney and dumb-bell shaped guard cells in stomata.
Which disease is caused by HPV?
Identify the INCORRECT statement.
Mention the name of sterile animal produced by intergeneric hybridisation.
Calcium and Phosphate ions are balanced between blood and other tissues by ______.
Which device is used to clean both dust and gases from polluted air?
Which of the following is a hormone releasing contraceptive?
Give the name of first transgenic plant.
Which of the following is the only gaseous plant growth regulator?
How many mitotic divisions take place during the formation of a female gametophyte from a functional megaspore?
Rivet Popper Hypothesis is an analogy to explain the significance of _______.
In Hamburger’s phenomenon, _______.
Histones are rich in _______.
Which of the following group shows ZW-ZZ type of sex determination?