121.

The largest artery in human body is

• Aorta

• Capillary

• Vena cava

• Vena cava

Nitrification is the biological process of converting

• N₂ into nitrate

• N₂ into nitrite

• Ammonia into nitrite

• Ammonia into nitrite

What is the main purpose of white blood corpuscles?

• to carry nutrients

• to combat infection

• to carry oxygen

• to carry oxygen

Clove is obtained from

• Root

• Stem

• Leaves

• Leaves

The suicidal bags of the cell are

• Lysosomes

• Ribosomes

• Dictyosomes

• Dictyosomes

Who among the following is credited with starting the work on plant tissue culture?

• F.C. Steward

• P. Maheshwari

• P.R. White

• P.R. White

DOTS is a treatment given to patients suffering from ..............

• Polio

• AIDS

• Hepatitis

• Hepatitis

Polyploidy arises due to change in the

• Number of chromatids

• Structure of genes

• Number of chromosomes

• Number of chromosomes

Increased RBC's in the blood leads to a condition called

• Anemia

• Haemophilia

• Polycythemia

• Polycythemia

Haematopoiesis take place in

• Lungs

• Pancreas

• Liver

• Liver