The Harmones are the:

A. Chemical messengers

B. Zoological messengers

C. Physical messengers

D. Bio physical messengers

Antigen is a substance which

A. Lowers body temperature

B. Destroys harmful bacteria

C. Triggers the human immune system

D. Is used as an antidote to poison

Enzymes are?

A. Proteins

B. Minerals

C. Oils

D. Fatty acids

Anaerobics are:

A. Bacteria which can complete their life-cycle without oxygen

B. Bacteria which can complete their life cycle without water

C. Colonies of unicellular bacteria

D. Colonies of multi-cellular bacteria

Vaccines are:

A. Same as monoclonal antibodies

B. Treated bacteria or viruses or one of their proteins

C. MHC proteins

D. strands of nucleic acids

Duodenum is situated:

A. At the uppermost part of the small intestine

B. Near the lungs

C. In the brain

D. At the tail end of the intestine

During the day time, plants:

A. Take in oxygen and give out carbon dioxide

B. Take in carbon dioxide and give out nitrogen

C. Take in nitrogen and give out oxygen

D. Take in carbon dioxide and give out oxygen

Age of a tree can be determined by:

A. Counting the number of rings in the stem

B. Counting the number of leaves

C. Counting the number of branches

D. Measuring the size of the tree

Bryophytes are:

A. Vascular plants

B. Non-vascular plants

C. Trancheopytes

D. Prokaryotes

The ligaments join

A. Muscle to muscle

B. bone to bone

C. Muscle to bone

D. None of these

Chromosomes are

A. Present only in the nucleus of a cell

B. The biggest in number in human cells

C. Made up of DNA as a main component

D. Visible in all cells at every time

Why do we feel drowsy after a heavy meal?

A. The biological clock is upset

B. The body muscles are fatigued

C. The hypothalamus produces melatonin to induce sleep

D. Brain receives less oxygen as blood rushes to supply oxygen and nutrition to the contracting stomach and intestines