GATE life science 2019 (Botany) mock test

By Kamal Pandey / February 7, 2021 / PhD Entrance

Applying for GATE life sciences? Here is the Botany previous year question paper formulated in the form of a quiz. This quiz contains 20 Botany questions asked in GATE 2019.

Solve complete GATE 2019 life science paper quiz- Click here

Which one of the following ecosystems is represented by an inverted pyramid of numbers?

Parasitic forest

Pond

Desert

Grassland

None

Raphides are deposits of

protein bodies

calcium oxalate

silica bodies

calcium carbonate

None

Which one of the following families shows bicollateral vascular bundle in the transverse section of the stem?

Malvaceae

Rutaceae

Asteraceae

Cucurbitaceae

None

Arbuscules are highly branched structures, formed

arbutoid mycorrhizae

endomycorrhizae

ectomycorrhizae

monotropoid mycorrhizae

None

Which one of the following combinations of polysaccharides is present in plant cell wall?

Only cellulose, hemicellulose and pectin

Only cellulose, hemicellulose and fibroin

Only cellulose, pectin and lignin

Only cellulose, hemicellulose and lignin

None

Which one of the following statements is INCORRECT?

Nitrogen fixation is anaerobic process

Root nodules are found in Glycine max

Nitrogen fixation is aerobic process

Dinitrogenase catalyzes reduction of nitrogen to ammonia

None

Which one of the following statements is INCORRECT with respect to cyclic photophosphorylation?

ATP is generated without concomitant formation of NADPH

Electron flows from Photosystem I to cytochrome bf complex

Cyclic photophosphorylation occurs when NADP+ /NADPH ratio is high

Photosystem II does not participate in cyclic photophosphorylation

None

The plant cells are considered totipotent. The phenomenon of a mature cell reverting to the meristematic state and forming undifferentiated callus tissue is called

redifferentiation

organogenesis

dedifferentiation

recalcitrancy

None

Glyphosate is a broad spectrum herbicide. Upon application to leaves, it is translocated to meristematic areas and underground rhizomes by

phloem

tracheids

xylem

border pits

None

10.

If a species has 2n = 16 chromosomes, the number of chromosomes per cell in a double monosomic individual would be_________

1 out of 2

11.

Rubisco catalyzes conversion of ribulose 1,5-bisphosphate to

P. two molecules of stable 3-phosphoglycerate
Q. one molecule of 3-phosphoglycerate and one molecule of phosphoglycolate
R. one molecule of ribulose 5-phosphophate
S. one molecule of ribose 5-phosphate
Choose only the correct combination

Q and S

R and S

P and Q

P and S

None

12.

Select correct combination of molecules given in Group I with their functions in Group II

Group I .............................Group II
P. Ubiquitin .............1. Cell wall loosening enzymes
Q. Phytotropins ......2. Repressors in gibberellin signaling
R. Extensins ..........3. Mediator of protein degradation
S. DELLA proteins ..4. Noncompetitive inhibitors of polar transport of auxin

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

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

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

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

None

13.

Match the plant species and their corresponding families with their economically important products:

Plant species .....................Family .................Plant product
P. Cannabis sativa .........1. Lamiaceae .........i. Oil from seeds
Q. Corchorus olitorius ....2. Cannabaceae ....ii. Eugenol from leaves
R. Ocimum sanctum .....3. Euphorbiaceae ...iii. Fibre from stem
S. Ricinus communis ....4. Tiliaceae ............iv. Marijuana from leaves

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

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

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

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

None

14.

Cybrids may arise through the

fusion of a normal protoplast with another nucleated protoplast of different origin

elimination of one of the nuclei from heterokaryon formed from two protoplasts of different origin

fusion of a normal cell with another nucleated cell

fusion between a normal protoplast and a protoplast containing viable nucleus

None

15.

Match the disease with causative organism and affected crop

Disease .....................Causative organism .....................Crop
P. Powdery mildew ..1. Albugo candida ..........................i. Corn
Q. White rust ..........2. Phytophthora infestans ..............ii. Tomato
R. Downy mildew ....3. Erysiphe orontii .........................iii. Potato
S. Late blight ..........4. Peronoscleropora phillippinensis..iv. Mustard

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

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

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

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

None

16.

Match the options in Group I with that of Group II with respect to steps in signal transduction mechanism in plants

Group I .....................................................Group II
P. Phospholipase C .......1. stimulates release of calcium from intracellular stores
Q. Inositol triphosphate ..2. regulates ion channels/activates various enzymes
R. Diacylglycerol ...........3. hydrolyzes posphatidylinositol bisphosphate (PIP2)
S. Phosphatidic acid ......4. phosphorylated to phosphatidic acid

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

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

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

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

None

17.

Which one of the following statements is CORRECT with respect to endosperm development? It originates

by a phenomenon called apomixis

from the fusion product of three haploid nuclei - one from male gametophyte and two from the female gametophyte

from the fusion product of two haploid nuclei - one from male gametophyte and one from the female gametophyte

from the fusion product of three haploid nuclei - two from male gametophyte and one from the female gametophyte

None

18.

Which one of the following methods is INCORRECT with respect to haploid plant production? It can be produced

by distant hybridization, followed by selective elimination of chromosomes of one of the parents

from nucellar tissue

from an unfertilized egg cell

from isolated pollen culture

None

19.

Plant weight is determined by a pair of alleles at each of the two independently assorting loci (Aa and Bb) that are additive and equal in their effects. The recessive alleles do not contribute towards plant weight. Plants with genotype aa bb are 1 g in weight, whereas plants with genotype AA BB weigh 3.4 g. Plant with genotype aa bb is crossed with a plant of genotype AA BB. The weight (in g, round off to one decimal place) of an individual plant in F1 progeny of this cross would be_________

20.

A cell in G₁ of Interphase has 12 chromosomes. In Anaphase-I of meiosis, the number of
DNA molecules per cell will be__________

2 out of 2