About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and

• phosphorus and sulphur

• sulphur and magnesium

• magnesium and sodium

• magnesium and sodium

Two genes R and Y are located very close on the chromosomal linkage map of a maize plant. When RRYY and rryy genotypes are hybridised, the F₂ segregation will show:

• higher number of the recombinant types.

• segregation in the expected 9 : 3 : 3 : 1 ratio

• segregation in 3 : 1 ratio

• segregation in 3 : 1 ratio

Which one of the following is being utilised as a source of biodiesel in the Indian countryside?

• betroot

• sugarcane

• pongamia

• pongamia

In which one of the following the BOD (Biochemical Oxygen Demand ) of sewage (s), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order?

• SE < S < PE < DE

• SE < PE < S < DE

• PE < S < SE < DE

• PE < S < SE < DE

In the human female, menstruation can be deferred by the administration of

• LH only

• Combination of FSH and LH

• Combination of estrogen and progesterone 

• Combination of estrogen and progesterone 

Select the correct statement from the following:

• Darwinian variations are small and directionless

• Fitness is the end result of the ability to adapt and gets selected by nature

• All mammals except whales and camels have seven cervical vertebrae

• All mammals except whales and camels have seven cervical vertebrae

87.

Two plants can be conclusively said to belong to the same species if they

• can reproduce freely with each other and form seeds

• have more than 90 per cent similar genes

• look similar and possess identical secondary metabolites

• look similar and possess identical secondary metabolites

A sequential expression of a set of human genes occurs when a steroid molecule binds to the

• transfer RNA

• messenger RNA

• DNA sequence

• DNA sequence

In a coal-fired power plant, electrostatic precipitators are installed to control emission of

• SO₂

• NO_X

• SPM

• SPM

Probiotics are

• safe antibiotics

• cancer inducing microbes

• new kind of food allergens

• new kind of food allergens