General Science Jkssb Biology Set 1 Mcqs (605 MCQs) | JKSSB & SSC Quiz

General Science

jkssb biology set 1 mcqs

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Practice Questions

605 Total
Question 51 Discuss
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In which year did Wilhelm Johannsen coin the term 'gene' to describe the Mendelian units of heredity?

A
1909
B
1900
C
1920
D
1910

Answer & Explanation

Correct Option: A

Renowned Danish botanist Wilhelm Johannsen officially introduced the specific word 'gene' into the scientific lexicon in 1909 to concisely describe the fundamental, indivisible physical units of biological heredity.
Question 52 Discuss
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Which of the following is a rare group of genetic disorders caused by mutations of certain genes affecting the colour (pigmentation) of the skin, hair and eyes?

A
Alkaptonuria
B
Alagille syndrome
C
Albinism
D
Angelman syndrome

Answer & Explanation

Correct Option: C

Albinism is a noticeable congenital genetic disorder prominently characterized by a severe lack of bodily melanin pigment production, visibly affecting the total coloration of the skin, hair, and eyes.
Question 53 Discuss
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In which of the following plants do roots arise from parts of a plant other than the radicle?

A
Monstera
B
Turnip
C
Mustard plant
D
Maize

Answer & Explanation

Correct Option: A

Vining Monstera plants routinely develop specialized adventitious roots, which are structural roots that purposefully grow from existing stems or broad leaves rather than strictly originating from the initial embryonic radicle.
Question 54 Discuss
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Which of the following animals can change their gender during their life span?

A
Dog
B
Clownfish
C
Elephant
D
Eagle

Answer & Explanation

Correct Option: B

Clownfish distinctly exhibit sequential hermaphroditism, meaning they famously possess the unique biological ability to permanently change their functional sex from male to female during their active lifespan.
Question 55 Discuss
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Which of the following muscles regulates the exit of food from the stomach into the small intestine?

A
Cardiac sphincter
B
Diaphragm
C
Pyloric sphincter
D
Ileocecal valve

Answer & Explanation

Correct Option: C

The robust pyloric sphincter is a powerful, localized ring of smooth muscle that strictly controls the gradual passage of partially digested food (chyme) directly from the stomach down into the duodenum.
Question 56 Discuss
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In honey bees,

A
males are triploid and females are tetraploid.
B
males are haploid and females are diploid.
C
males are diploid and females are haploid.
D
males are tetraploid and females are triploid.

Answer & Explanation

Correct Option: B

Honey bees effectively utilize a complex haplodiploid sex-determination system, where unfertilized eggs seamlessly develop into haploid males (drones) and heavily fertilized eggs become standard diploid females.
Question 57 Discuss
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In a dihybrid cross between two heterozygous fruit flies with brown bodies and red eyes (BbEe × BbEe ), what will be the probability of getting BBEE genotype?

A
1/16
B
1/4
C
1/8
D
1/2

Answer & Explanation

Correct Option: A

According to established Mendelian genetics and the simple product rule, the completely independent probability of inheriting homozygous dominant alleles for two totally separate traits from heterozygous parents is 1/4 multiplied by 1/4, equaling exactly 1/16.
Question 58 Discuss
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Which of the following enzymes are essential of DNA replication in an animal cell?

A
Reverse transcriptase, DNA polymerase, DNA primase
B
Topoisomerase, DNA ligase, DNA polymerase, DNA primase
C
Reverse transcriptase, RNA polymerase, Ligase
D
Reverse transcriptase, DNA polymerase, Ligase

Answer & Explanation

Correct Option: B

Successful and highly accurate DNA replication necessarily requires topoisomerase to safely unwind the helix, primase to lay initial RNA primers, polymerase to strictly build the new continuous strand, and ligase to permanently seal all remaining fragments.
Question 59 Discuss
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Which of the following is a medium-sized globular protein that acts as a pancreatic serine protease found in the digestive system of many vertebrates?

A
Amylase
B
Lipase
C
Trypsin
D
Pepsin

Answer & Explanation

Correct Option: C

Trypsin is an absolutely critical digestive enzyme secreted locally by the pancreas that actively and efficiently breaks down large dietary proteins into much smaller peptides within the delicate small intestine.
Question 60 Discuss
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In a symport:

A
a molecule moves across a membrane independent of other molecules
B
both molecules cross the membrane in the same direction
C
both molecules cross the membrane in the opposite direction
D
a molecule moves across a membrane dependent of other molecules

Answer & Explanation

Correct Option: B

A specialized symport is a highly specific integral membrane protein that simultaneously and reliably transports two distinct types of molecules across the cell membrane in the exact same physical direction.
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