Year-wise Biology practice
NEET 2019 Biology PYQs Check your understanding, bookmark questions and revisit your mistakes.
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90 questions in this collection · Page 9 of 9
Environmental Issues
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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Environmental Issues
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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Environmental Issues
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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Environmental Issues
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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Biotechnology And Its Applications
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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Reproductive Health
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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Cell The Unit Of Life
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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Plant Kingdom
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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Respiration In Plants
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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Anatomy Of Flowering Plants
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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AI-generated explanation. Check against your textbook.
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).
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