🧬
NEET Zoology PYQs
Class XI & Class XII
•
NCERT Based
•
Instant Feedback
🧬 Zoology
📘 Class XI & XII
🤖 AI Explanations
This page score:
0 /40
407 questions in Zoology
Smooth endoplasmic reticulum _______.
A
has ribosomes attached to its surface
B
is the major site for the synthesis of lipids
C
is actively involved in protein synthesis
D
is a site for the synthesis of carbohydrates
Show explanation
Smooth endoplasmic reticulum lacks ribosomes and is primarily responsible for lipid synthesis and detoxification.
Which one of the following statements is incorrect?
A
α-cells of pancreas secrete glucagon
B
α-cells of pancreas secrete insulin
C
Glucagon stimulates glycogenolysis
D
β-cells of pancreas secrete insulin
Show explanation
Alpha cells secrete glucagon, whereas beta cells secrete insulin.
The correct sequence of adult cell cycle phases is _______.
A
G1-G2-S-M
B
G1-M-G2-S
C
G1-S-G2-M
D
S-M-G2-G1
Show explanation
The cell cycle proceeds through G1, S, G2 and M phases in that order.
Given below are two statements:
A
Both Statement I and Statement II are correct.
B
Both Statement I and Statement II are incorrect.
C
Statement I is correct but Statement II is incorrect.
D
Statement I is incorrect but Statement II is correct.
Show explanation
Reptilia means creeping or crawling animals, but crocodilians possess a four-chambered heart, making Statement II incorrect.
Given below are two statements:Statement I: Chromosomes are fully condensed at the end of prophase I.Statement II: Meiosis I resembles mitosis.
A
Both Statement I and Statement II are true
B
Both Statement I and Statement II are false
C
Statement I is correct, but Statement II is false
D
Statement I is incorrect, but Statement II is true
Show explanation
Chromosomes become fully condensed during diakinesis. Meiosis I is reductional, whereas meiosis II resembles mitosis.
Which of the following is not a characteristic of chordates?
A
Presence of notochord
B
Central nervous system is dorsal
C
Absence of gills
D
Presence of post anal part (tail)
Show explanation
Chordates possess pharyngeal gill slits during some stage of life.
Arrange the following elements in descending order of their contribution to percentage weight of the human body.
A
(a), (b), (c), (d)
B
(c), (a), (b), (d)
C
(b), (c), (d), (a)
D
(b), (a), (c), (d)
Show explanation
Oxygen contributes the highest percentage by weight, followed by carbon, hydrogen and nitrogen.
In frogs, the number of pairs of cranial nerves arising from the brain are _______.
A
6
B
9
C
10
D
12
Show explanation
Frogs possess ten pairs of cranial nerves.
Which of the following is used as a clot buster?
A
Streptokinase
B
Penicillin
C
Cyclosporin A
D
Statins
Show explanation
Streptokinase is used as a clot buster to remove blood clots from the blood vessels of patients who have suffered myocardial infarction.
Given below are two statements:Statement I: Down's syndrome is caused by the absence of one of the X-chromosomes.Statement II: Turner's syndrome is caused by the presence of an additional copy of the chromosomes.
A
Both Statement I and Statement II are correct
B
Both Statement I and Statement II are incorrect
C
Statement I is correct but Statement II is incorrect
D
Statement I is incorrect but Statement II is correct
Show explanation
Down's syndrome is caused by trisomy of chromosome 21. Turner's syndrome is caused by the absence of one X chromosome, resulting in the chromosome complement 45, XO.
