31.

Assertion: Pulmonary circulation consists of flow of deoxygenated blood from right ventricle to the lungs and flow of oxygenated blood from lungs to the left atrium.

Reason: Systemic circulation consists of flow of oxygenated blood from the left ventricle to all parts of the body and deoxygenated blood from different parts to right atrium.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion: Adrenocorticotropic-Releasing Hormones (ARH) excite the anterior lobe of
pituitary gland to produce adrenocorticotropic hormone (ACTH).

Reason: ACTH stimulates the adrenal cortex to secrete its glucocorticoid and mineralocorticoid hormones.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

The total number of biodiversity hotspots in the world are

• 72

• 34

• 52

• 24

Which of the following occurs due to monosomy of sex chromosome

• Down's syndrome

• Turner's syndrome

• Haemophilia

• Sickle cell anaemia

During menstrual cycle, levels of LH and estrogen are highest around

• 14day

• 21day

• 7day

• 28day

Somaclones are prepared by

• callus culture

• sexual reproduction

• micropropagation

• somatic hybridisation

Plants do not get benefit from

• N₂ in air

• O₂ in air

• CO₂ in air

• O₃ in air

Which of the following associations shows mutualism

• Fig and wasp

• Barnacles on whale

• Roundworms in human intestine

• Orchids on mango tree

How many haploid nuclei are present in a mature pollen grain

• One

• Two

• Three

• Four

In cloning of cattle a fertilized egg is taken out of the mother's womb and

• in the eight cell stage, cells are separated and cultured untill small embryos are formed which are implanted into the womb of other cows

• in the eight cell stage the individual cells are separated under electrical field for further development in culture media

• from this upto eight identical twins can be produced

• the egg is divided into 4 pairs of cells which are implanted into the womb of other cows.