31.

Assertion: No secondary growth takes place in monocots.

Reason: Secondary growth is not related with cambium.

• 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: Soil particles, particularly clay and organic matter in soil, contain negative charges that attract positively-charged ions such as Ca²⁺, K⁺ and Mg²⁺.

Reason: Essential elements derived from soil are termed as mineral elements while those derived from air or water are known as nonmineral elements.

• 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: Presence of large amounts of nutrients in water body causes excessive growth of planktonic algae.

Reason: It is due to biomagnification.

• 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.

Match column1 and column2 and select the correct options from codes given below.

      Column1        Column2

A. Pigments          1) Abrin, ricin

B. Toxin                2) Concanavalin A

C. Alkaloid            3) Carotenoids A

D. Lectins             4) Morphine, codeine

• A-(4), B-(3), c-(1), D-(2)

• A-(2), B-(4), c-(1), D-(3)

• A-(3), B-(1), c-(4), D-(2)

• A-(1), B-(2), c-(3), D-(4)

Hormones for the menstrual cycle are produced by

• ovaries only

• uterus only

• ovaries and uterus

• ovaries and anterior pituitary

Match Column - I with Column -II and select the correct option from given codes.

   Column-I                 Column- II

A. Brassica                (i) Himgiri

B. Okra                     (ii) Pusa Komal

C. Wheat                  (iii) Pusa Gaurav

D. Cowpea                (iv) Pusa Sawani

• A- (iii), B- (iv), C-(1), D- (ii)

• A-(i), B- (iii), C - (ii), D- (iv)

• A- (iv), B- (iii), C- (i), D- (ii)

• A- (ii), B - (iv), C- (i), D - (iii)

What is the correct sequence of the formation of female gametophyte in angiosperms

• Nucellus, megapore tetrad, megaspore mother cell, megaspore, female gametophyte

• Megaspore tetrad, nucellus, megaspore mother cell, megaspore, female gametophyte

• Nucellus, megaspore mother cell, megaspore tetrad, megaspore, female gametophyte

• Megaspore mother cell, megaspore tetrad, megaspore, nucellus, female gametophyte

Match the following and select the correct option.

        Column-I          Column- II
A. Emphysema        (i) Increase in the concentration of non-biodegradable                                                                    substances in food chains

B. ADA deficiency    (ii) $\alpha$-1 antitrypsin

C. Eutrophication    (iii) Bone marrow transplantation

D. Biomagnification (iv) Nutrient enrichment of a water body

• A- (iii), B - (ii), C- (iv), D - (i)

• A-(ii), B- (iii),C- (iv), D-(i)

• A-(ii), B - (iv),C - (i), D - (iii)

• A- (iv), B- (ii), C- (iii), D-(i)

Select the correct order of processing of PCR.

• Extension, primer annealing, denaturation

• Denaturation, primer annealing, extension

• Denaturation, extension, primer annealing

• Primer annealing, denaturation, extension

Plasmid vector in DNA recombinant technology means

• a virus that transfers gene to bacteria

• extra-chromosomal autonomously replicating circular DNA

• sticky end of DNA

• any fragment of DNA carrying desirable gene.