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NEET Biology 2019 PYQs
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90 questions in NEET 2019
Which one of the following equipments is essentially required for growing microbes on a large scale, for industrial production of enzymes?
A
BOD incubator
B
Bioreactor
C
Sludge digester
D
Industrial oven
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Which of these following methods is the most suitable for disposal of nuclear waste?
A
Burry the waste within rocks deep below the
Earth's surface
B
Dump the waste within rocks under deep ocean
C
Bury the waste under Antarctic ice-cover
D
Shoot the waste into space
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Which of the following pairs of gases is mainly
responsible for green house effect?
A
Carbon dioxide and Methane
B
Nitrogen and Sulphur dioxide
C
Oxygen and Nitrogen
D
Ozone and Ammonia
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Polyblend, a fine powder of recycled modified
plastic, has proved to be a good material for:
A
making tubes and pipes
B
construction of roads
C
use as a fertilizer
D
making plastic sacks
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Which of the following in true for Golden rice?
A
It has yellow grains, because of a gene introduced
from a primitive variety of rice
B
It is drought tolerant, developed using
Agrobacterium vector
C
It is pest resistant, with a gene from Bacillus
thuringiensis
D
It is Vitamin A enriched, with a gene from
daffodil
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Which of the following sexually transmitted diseases
is not completely curable?
A
Chlamydiasis
B
Genital herpes
C
Genital warts
D
Gonorrhoea
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Which of the following statements is not correct?
A
Lysosomes have numerous hydrolytic enzymes.
B
The hydrolytic enzymes of lysosomes are active
under acidic pH.
C
Lysosomes are membrane bound structures.
D
Lysosomes are formed by the process of packaging in the endoplasmic reticulum.
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From evolutionary point of view, retention of the
female gametophyte with developing young embryo
on the parent sporophyte for some time, is first
observed in:
A
Liverworts
B
Pteridophytes
C
Mosses
D
Gymnosperms
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Conversion of glucose to glucose-6-phosphate, the
first irreversible reaction of glycolysis, is catalyzed by:
A
Hexokinase
B
Aldolase
C
Enolase
D
Phosphofructokinase
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Phloem in gymnosperms lacks:
A
Both sieve tubes and companion cells
B
Companion cells only
C
Sieve tubes only
D
Albuminous cells and sieve cells
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Explanation: In gymnosperms, the phloem does not have sieve tubes or companion cells. Instead, it contains sieve cells with associated albuminous cells. Thus, it lacks both sieve tubes and companion cells.
? Did You Know? NCERT describes gymnosperm phloem as having sieve cells and albuminous cells, not sieve tubes or companion cells.
? NCERT Memory Line: Gymnosperm phloem: sieve cells + albuminous cells (no sieve tubes, no companion cells).
