GATE XL branch:xl PYQs & Answers — Page 43

Questions 421–430 of 1235. Imported answers require independent review unless marked reviewed.

Match the tasks given in Group I with the associated techniques conventionally used as listed in Group II.

Group I P. Ploidy analysis Q. Profiling DNA methetion R. Identifying non-coding RNAs S. Identifying SNPs T. Satellite DNA isolation

Group II

RNA sequencing

Exome sequencing

Fluorescence in situ hybridization

Bisulfite sequencing

Density-gradient centrifugation

Your answerChoose one option.

P-2; Q-1; R-3; S-4; T-5

P-3; Q-4; R-1; S-2; T-5

P-5; Q-4; R-1; S-2; T-3

P-3; Q-5; R-1; S-2; T-4

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Periderm is a protective tissue found in stems and roots of gymnosperm and woody dicotyledons. It contributes to the increased thickness by secondary growth. Match the peridermal components given in Group I with the cell/tissue types given in Group II.

Group I (P) Phelloids (Q) Phellogen (R) Phellem (S) Phelloderm

Group II (1) Tissue resembling cortical parenchyma (2) Cork cambium (3) Cork-like cells (4) Cork

Your answerChoose one option.

P-4; Q-3; R-1; S-2

P-3; Q-2; R-4; S-1

P-2; Q-1; R-3; S-4

P-4; Q-1; R-3; S-2

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Match the following rice diseases in Group I with their causal agents in Group II.

Group I (P) Blast (Q) False smut (R) Sheath blight (S) Downy mildew

Group II (1) Sclerophthora macrospora (2) Rhizoctonia solani (3) Ustilaginoidea virens (4) Puccinia graminis (5) Magnaporthe grisea

Your answerChoose one option.

P-5; Q-3; R-2; S-1

P-4; Q-2; R-5; S-3

P-4; Q-5; R-3; S-1

P-5; Q-4; R-1; S-2

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Central vascular cylinder or stele consists of the primary vascular system (xylem and phloem) and the associate fundamental tissue. Match the schematics of stele in Group I (xylem shown in green, and phloem shown as ▦) with their respective types in Group II.

Group I: (P), (Q), (R), (S), each represented by a schematic.

Diagram for Life Sciences question 58 (figure 2)

Diagram for Life Sciences question 58 (figure 3)

Diagram for Life Sciences question 58 (figure 4)

Group II (1) Protostele (2) Eustele (3) Atactostele (4) Ectophloic siphonostele (5) Amphiphloic siphonostele

Your answerChoose one option.

P-2; Q-4; R-1; S-3

P-5; Q-1; R-4; S-2

P-5; Q-3; R-1; S-2

P-3; Q-4; R-2; S-5

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Consider the following four experimental observations (i, ii, iii, iv) on the effect of the FT gene on flowering transition in the shoot apical meristem (SAM) of Arabidopsis thaliana.

i) The FT promoter is active in leaves alone.

ii) The ft null mutation causes delayed flowering transition of the SAM.

iii) Expressing a recombinant FT protein fused to nuclear localization signal sequence under the endogenous promoter does not rescue the delayed-flowering phenotype of the ft null mutant.

iv) Downregulation of FT transcript in the SAM by RNA interference in the wild-type background does not alter flowering transition.

Which one of the following conclusions best explains the above observations?

Your answerChoose one option.

FT protein resident in leaves causes flowering transition of the SAM.

FT transcript moves from leaves to the meristem and promotes flowering.

FT protein moves from leaves to the SAM and promotes flowering.

Both FT transcript and FT protein are required in the SAM to promote flowering.

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Which one of the options given correctly matches the alkaloids in Group I with their source plants in Group II?

Group I P. Cocaine Q. Caffeine R. Morphine S. Atropine

Group II

Coca

Nightshade

Coca

Poppy

Your answerChoose one option.

P-3; Q-1; R-4; S-2

P-1; Q-3; R-4; S-2

P-2; Q-1; R-3; S-4

P-4; Q-2; R-1; S-3

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A drought tolerant rice genotype was found to be associated with a missense mutation in the gene A. Which one or more of the following experiments is/are appropriate to validate whether the mutation in A is the causal factor for drought tolerance?

Your answerSelect all correct options. You can choose more than one.

Introduce the same mutation in a drought sensitive rice genotype and test if it becomes drought tolerant.

Delete the wild-type A in drought sensitive plant and test if it becomes drought tolerant.

Determine the stability of the protein encoded by the wild-type and the mutant forms of A.

Repair the mutation in the drought tolerant rice genotype and test if it becomes drought sensitive.

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Blue light can directly induce opening of stomata. Blue light also triggers photosynthesis in the guard cells, which indirectly induces stomatal opening. Which one or more of the following experimental approaches would test the direct effect of blue light on stomatal opening?

Your answerSelect all correct options. You can choose more than one.

Application of low photon fluxes of red light followed by high fluence rate of blue light.

Application of high fluence rates of red light followed by low photon fluxes of blue light.

Application of high fluence rates of blue light followed by high photon fluxes of red light.

Inhibition of photosynthetic electron transport by dichlorophenyldimethylurea (DCMU).

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In a diploid angiosperm species, flower colour is regulated by the R gene. RR and Rr genotypes produce red flowers, whereas the rr genotype produces white flowers. If two individual plants are randomly selected from a large segregating population of a genetic cross between RR and rr parents, the probability of both the plants producing red flowers is ______. (Rounded off to two decimal places)

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A cytoplasmic male-sterile female plant with the restorer (nuclear) genotype rr is crossed to a male-fertile male plant with the genotype RR. Both RR and Rr can restore the fertility, whereas rr cannot. When an F1 female plant with Rr genotype was test-crossed to a male-fertile male plant with the rr genotype, the percentage of the population that is male fertile would be ______ %. (Answer in integer)

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GATE XL branch:xl PYQs

Question 55

Question 56

Question 57

Question 58

Question 59

Question 60

Question 61

Question 62

Question 63

Question 64