31.

Assertion: Glucose is the favoured respiratory substrate.

Reason: When glucose is used as respiratory substrate it is completely oxidised and RQ is 1.

• 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 water logging capacity of garden soil will be determined by measuring the weight of

• soil by adding water and humus

• water saturated soil then heating the soil till it is dry and then measuring the weight of soil

• soil by adding water, biomass and humus

• soil from different locations with biomass.

Refer to the given figure and choose the correct option regarding its parts labelled as A-F

• B-Graafian follicle, F-Corpus luteum

• C-Graafian follicle, A-Ovum

• B-Primary follicle, C-Tertiary follicle showing antrum

• E-Corpus callosum, D-Antrum cavity

The process where a population inhibits the growth of other population without affecting itself is known as

• amensalism

• mutualism

• parasitism

• commensalism

Select the correct statement regarding reproduction

• Mating in dogs is synchronised with lunar cycle.

• Salamanders always have internal fertilisation.

• In Trygon, the male introduces sperms into female through a modified pelvic fin.

• Catla has internal fertilisation

Documented microfossils have been found that are as old as

• 2.5 billion years

• 1.5 billion years

• 3.5 billion years

• 2.5 million years

Which of the following is not a factor that would limit the growth of a population

• Food shortage

• Immigration

• Disease

• Famine

When plants/animals are infected with virus, they may produce an anti-viral substance that is capable of inhibiting the multiplication of that virus. Identify the correct name ofthis substance

• Virion

• Antivirion

• Antigen

• Interferon

Match the tissues/molecules mentioned in column I with those of their degrading enzymes mentioned in column II and select the correct option from the given codes.
         Column I                   Column II
       A. Cell wall                  (i) Proteases
       B. RNA                       (ii) Pectinases
       C. Histone                  (iii) Ribonucleases
       D. Pectin                    (iv) Cellulase

• A-(iv), B-(iii), C-(i), D-(ii)

• A-(ii), B-(i), C-(iv), D-(iii)

• A-(i), B-(ii), C-(iii), D-(iv)

• A-(iii), B-(iv), C-(ii), D-(i)

Refer to the given figure and select the correct option regarding its parts labelled as A, B and C.

• A-Histone octamer, C-DNA

• B-H₁ histone, C-Histone octamer

• A-H₁ histone, B-DNA

• A-Histone octamer, C-H₁ histone