31.

Which type of meristems allow the fallen stems of cereals/ grasses to become erect?

• Apical meristem

• Lateral meristem

• Intercalary meristem

• Secondary meristem

Curdling of milk in small intestine occurs due to the action of

• trypsin

• erypsin

• rennin

• chymotrypsin

Biomagnification refers to

• rapid growth due to excessive intake of nutrients

• increase in population size

• decrease in population size

• increase in concentration of non-degrabable pollutants as they pass through food chain

The AIDS virus spreads through

• killer 'T' cells

• helper 'T' cells

• suppressor 'T' cells

• carrier 'T' cells

CO is more toxic than CO₂ because

• it affects the nervous system

• it damages lungs

• it reduces the oxygen carrying capacity of haemoglobin

• it forms acid with water

Leprosy is also called as

• Hansen's disease

• sarcoma

• slim disease

• leukamia

Cancer causing genes (oncogenes)  were discovered by

• Watson and Crick

• Beadle and Tatum

• Bishop and Varamus

• Temin and Baltimore

Beak is toothed in

• pelican

• kiwi

• ostrich

• Archaeopteryx

Interacting populations are

• symbiotic

• mutualistic

• parasitic

• coevolved

Tay Sach's disease is due to

• sex linked recessive gene

• sex linked dominant gene

• autosomal dominant gene

• autosomal recessive gene