GATE life science 2018 (Botany) paper quiz

By Kamal Pandey / February 5, 2021 / PhD Entrance

This is a GATE Life science 2018 question paper which we have formulated in the form of quiz. This quiz contains Botany questions from GATE 2018.

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Which of the following genera produces dimorphic seeds that help to broaden the time of germination in a variable habitat?

Xanthium

Linum

Pisum

Mangifera

None

The genes for microRNA (miRNA) in plants are usually transcribed by

RNA polymerase IV

RNA polymerase III

RNA polymerase II

RNA polymerase I

None

Which of the statements is TRUE for transposable elements Ac and Ds?

Both Ac and Ds are autonomous because they encode their own transposase

Only Ds is autonomous because it encodes its own transposase

Both Ac and Ds are non-autonomous because they do not encode their own transposase

Only Ac is autonomous because it encodes its own transposase

None

Identify the CORRECT statement.

Ribonucleases play role in sporophytic self-incompatibility in Brassicaceae

Ribonucleases play role in gametophytic self-incompatibility in Solanaceae

Receptor-like kinases play role in gametophytic self-incompatibility in Brassicaceae

Receptor-like kinases play role in sporophytic self-incompatibility in Solanaceae

None

Which of the following statements is TRUE for an ecotone?

An ecotone is an interface zone of two or more ecosystems

An ecotone is the synonym of an ecosystem

An ecotone is a special feature of land biomes

An ecotone is exclusively characterized by decreased biodiversity

None

Acid rain with a pH of 4.0 is more acidic than the rain with a pH of 6.0 by

10 times

100 times

2 times

1000 times

None

Which of the following plants produces Ylang-ylang oil?

Pandanus odoratissimus

Cananga odorata

Carcum copticum

Pimenta racemosa

None

Identify the INCORRECT statement in connection with polar transport of auxin.

AUX1 and PIN1 proteins are located in the opposite ends of a cell for polar transport

Polar auxin transport in root tends to be both acropetal and basipetal in direction

The putative influx carrier AUX1 is a cytosolic protein

Naphthylphthalamic acid (NPA) is an inhibitor of polar auxin transport

None

Which of the following stains is used to visualize callose under the microscope?

Toluidine blue

Aniline blue

Alcian blue

Thymol blue

None

10.

The coding sequence of a gene XLR18 has the single ORF of 783 bp. The approximate molecular weight of the XLR18 protein in kDa is ______.

1 out of 2

11.

Statements given below are either TRUE (T) or FALSE (F). Select the CORRECT combination.

P. Mitosis occurs exclusively in diploid mother cell
Q. Mitosis occurs both in diploid and haploid mother cells
R. Meiosis occurs exclusively in diploid mother cell
S. Meiosis occurs both in diploid and haploid mother cells

P-F, Q-T, R-F, S-T

P-T, Q-F, R-T, S-F

P-F, Q-T, R-T, S-F

P-T, Q-F, R-F, S-T

None

12.

You are asked to design a genetic construct for high-level expression of a gene encoding the therapeutic protein 18 (TP18) via plastid transformation. Select the CORRECT set of genetic elements for this construct.

rbcS promoter → TP18 coding sequence → rbcS transcription terminator

Actin1 promoter → TP18 coding sequence → Actin1 transcription terminator

Ubiquitin1 promoter → TP18 coding sequence → Ubiquitin1 transcription terminator

rbcL promoter → TP18 coding sequence → rbcL transcription terminator

None

13.

Select the CORRECT combination of the following statements.

P. The cyclic electron transport chain involving PSI results in net production of both ATP
and NADPH
Q. The cyclic electron transport chain involving PSI results in net production of ATP
R. Rubisco enzyme usually converts RuBP and CO2 into 2-phosphoglycolate and
3-phosphoglycerate
S. Rubisco enzyme usually converts RuBP and O2 into 2-phosphoglycolate and
3-phosphoglycerate

P, R

R, S

P, Q

Q, S

None

14.

Match the fruit characters with their families and representative plant species.

Fruit character....................Family..............Plant species
P. Syconus......................1. Moraceae.......i. Canavalia ensiformis
Q. Capsule, opening by..2. Fabaceae.......ii. Artabotrys odoratissimus
apical pores or valves
R. Legume...................3. Papaveraceae..iii. Ficus religiosa
S. An etaerio of drupe..4. Annonaceae.....iv. Papaver somniferum
.................................................................v. Pistacia vera
.................................................................vi. Citrus aurantium

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

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

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

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

None

15.

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

Disease.............Affected plant..............Causal organism
P. Black rot........1. Corn.............i. Fusarium oxysporum f.sp. cubense
Q. Loose smut....2. Banana........ii. Acidovorax avenae subsp. citrulli
R. Panama wilt...3. Watermelon..iii. Botryosphaeria obtusa
S. Bacterial fruit..4. Apple...........iv. Ustilago maydis
blotch
...................................................v. Plasmopara viticola
...................................................vi. Venturia inaequalis

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

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

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

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

None

16.

Select the CORRECT combination by matching Group-I with Group-II.

Group-I................................Group-II
P. Photorespiration..............1. Glutamate → 2-Oxglutarate
Q. Respiration.....................2. Acetyl-CoA → Malonyl-CoA
R. Amino acid degradation..3. 2-Oxglutarate → Succinyl-CoA
S. Fatty acid synthesis........4. Glycine → Serine

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

P-2, Q-1, R-4, S-1

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

P-3, Q-4, R-2, S-3

None

17.

Match the plant alkaloids with their uses and source species.

Alkaloid....................Use...................Source species
P. Codeine.........1. Stimulant..........i. Hyoscyamus niger
Q. Caffeine.........2. Analgesic.........ii. Catharanthus roseus
R. Scopolamine..3. Antineoplastic...iii. Cola nitida
S. Vinblastine.....4. Anticholinergic..iv. Papaver somniferum
......................................................v. Coptis japonica
......................................................vi. Senecio jacobaea

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

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

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

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

None

18.

Identify the CORRECT combination of statements with respect to chemical defense in plants.

P. Pisatin, a phytoalexin produced by Ricinus communis is a constitutive defense compound
Q. Phaseolus vulgaris produces Phaseolus agglutinin I, which is toxic to the cowpea weevil
R. A single step non-enzymatic hydrolysis of cyanogenic glycoside releases the toxic
hydrocyanic acid (HCN) to protect plant against herbivores and pathogens
S. Avenacin, a triterpenoid saponin from oat prevents infection by Gaeumannomyces
graminis, a major pathogen of cereal roots

P, S

P, Q

R, S

Q, S

None

19.

In garden pea, dwarf plants with terminal flowers are recessive to tall plants with axial flowers. A true-breeding tall plant with axial flowers was crossed with a true-breeding dwarf plant with terminal flowers. The resulting F1 plants were testcrossed, and the following progeny were obtained:

Tall plants with axial flowers = 320
Dwarf plants with terminal flowers = 318
Tall plants with terminal flowers = 79
Dwarf plants with axial flowers = 83
The map distance between the genes for plant height and flower position is______cM.

20.

Two true-breeding snapdragon (Antirrhinum majus) plants, one with red flowers and another with white flowers were crossed. The F1 plants were all with pink flowers. When the F1 plants were selfed, they produced three kinds of F2 plants with red, pink and white flowers in a 1:2:1 ratio. The probability that out of the five plants picked up randomly, two would be with pink flowers, two with white flowers and one with red flowers is _____%.

2 out of 2