GATE XL year:2020 PYQs & Answers — Page 6

Questions 51–60 of 125. Imported answers require independent review unless marked reviewed.

Among the following, which best describes an organism that lives at the expense of other organisms, harmful but usually not killing?

Your answerChoose one option.

Predator

Symbiotic

Prey

Parasite

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The oleo-gum resin asafoetida (hing) is obtained from the cut surface of

Your answerChoose one option.

Stem

Root

Leaf

Fruit

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

‘Bakanae’ disease or ‘foolish seedling’ disease is caused by

Your answerChoose one option.

Fungus

Bacterium

Virus

Mycoplasma

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Which of the following chemicals is used for doubling of chromosome numbers during production of ‘doubled haploids’ in crop plants?

Your answerChoose one option.

Hygromycin

Kanamycin

Colchicine

Glufosinate

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

An mRNA of a nuclear encoded plant gene, DSH20 has an ORF of 1353 nucleotides. Provided that average molecular weight of amino acid is 110 Dalton (Da), calculated molecular weight of DSH20 protein in kDa (round off to 1 decimal place) is _____

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Group I, Group II and Group III represent enzyme, product of the enzymatic reaction, and metabolic process, respectively.

Group I: P. Hexokinase; Q. Fumarase; R. PEP Carboxylase; S. Glycolate oxidase

Group II: i. Malate; ii. Glucose 6-P; iii. Hydrogen peroxide; iv. Cinnamic acid; v. Oxaloacetic acid

Group III: 1. Glycolysis; 2. Photorespiration; 3. TCA cycle; 4. Photosynthesis

The CORRECT combination for Group I, Group II and Group III is

Your answerChoose one option.

P-ii-1, Q-iv-3, R-v-2, S-iii-4

P-ii-1, Q-i-3, R-iv-4, S-iii-2

P-ii-2, Q-v-3, R-i-4, S-iii-1

P-iii-1, Q-i-3, R-iv-4, S-ii-2

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Match the following in CORRECT combination between Group I and Group II with reference to the agents that interfere with oxidative phosphorylation

Group I: P. Cyanide; Q. Antimycin A; R. Aurovertin; S. 2,4-Dinitrophenol

Group II: i. Blocks electron transfer from cyt b to cyt c₁; ii. Inhibits F₁; iii. Uncoupling of phosphorylation from electron transfer; iv. Inhibits cytochrome oxidase; v. Inhibits K⁺ ionophore

Your answerChoose one option.

P-iv, Q-i, R-ii, S-iii

P-v, Q-i, R-iii, S-iv

P-iv, Q-iii, R-ii, S-v

P-v, Q-ii, R-iii, S-iv

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

In relation to Agrobacterium mediated genetic engineering in plants, match the following in CORRECT combination

Gene name: P. virA; Q. virB; R. virD1; S. virG

Function: i. Acetosyringone receptor; ii. Conjug tube formation; iii. Topoisomerase; iv. Inducer of all vir operons; v. Octopine synthesis

Your answerChoose one option.

P-iv, Q-iii, R-ii, S-v

P-ii, Q-i, R-iii, S-v

P-i, Q-ii, R-iii, S-iv

P-iii, Q-i, R-ii, S-iv

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Match the plant part (Group I) with the product obtained (Group II) and the representative plant species (Group III) in CORRECT combination.

Group I

P. Bark

Q. Leaf

R. Flower

S. Fruit

Group II

i. Tannins

ii. Saffron

iii. Codeine

iv. Aromatic oil

Group III

Papaver somniferum

Camellia sinensis

Cinnamomum zeylanicum

Crocus sativus

Your answerChoose one option.

P-ii-1, Q-i-3, R-iv-2, S-iii-4

P-ii-1, Q-i-2, R-iv-4, S-iii-3

P-ii-2, Q-iv-3, R-i-4, S-iii-1

P-iv-3, Q-i-2, R-ii-4, S-iii-1

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Select the CORRECT combination by matching the disease, causal organism and the affected plant.

Disease	Causal organism	Affected plant
P. Stem rust	i. Cercospora personata	1. Wheat
Q. Wart disease	ii. Plasmopara viticola	2. Ground nut
R. Tikka/leaf spot	iii. Synchytrium endobioticum	3. Potato
S. Downy mildew	iv. Puccinia graminis	4. Grape
		5. Apple
		6. Rice

Choose the CORRECT combination:

Your answerChoose one option.

P-iv-1, Q-iii-3, R-ii-2, S-ii-4

P-ii-1, Q-i-6, R-iv-4, S-iii-2

P-iii-1, Q-iv-3, R-i-5, S-ii-4

P-iv-1, Q-ii-3, R-iii-2, S-i-5

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

GATE XL year:2020 PYQs

Question 6

Question 7

Question 8

Question 9

Question 10

Question 11

Question 12

Question 13

Question 14

Question 15