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 301 Discuss
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Which of the following is responsible for the 'Earthly' smell after the first rain

A
Actinomycetes
B
Cyanobacteria
C
Lactobacillus
D
Spirogyra

Answer & Explanation

Correct Option: A

The smell (petrichor) is partly due to 'geosmin', a compound produced by soil-dwelling bacteria called Actinomycetes.
Question 302 Discuss
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In humans the digestion of proteins starts in the

A
Mouth
B
Stomach
C
Small Intestine
D
Oesophagus

Answer & Explanation

Correct Option: B

While starch digestion starts in the mouth, protein digestion begins in the stomach via the enzyme pepsin.
Question 303 Discuss
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Which of the following is known as the 'Widow's Peak' or 'Master Gland' of the endocrine system

A
Adrenal
B
Pituitary
C
Thymus
D
Thyroid

Answer & Explanation

Correct Option: B

The pituitary gland is called the master gland because it controls the secretions of many other endocrine glands.
Question 304 Discuss
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Statement I Viruses are considered a link between living and non-living Statement II Viruses lack a cellular structure but contain genetic material

A
Only Statement I is correct
B
Only Statement II is correct
C
Both Statements are correct
D
Neither Statement is correct

Answer & Explanation

Correct Option: C

Viruses show living characteristics only inside a host and are inert outside, lacking their own metabolic machinery.
Question 305 Discuss
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The scientific name of Vitamin B1 is

A
Riboflavin
B
Thiamine
C
Niacin
D
Pyridoxine

Answer & Explanation

Correct Option: B

Thiamine deficiency leads to Beri-beri.
Question 306 Discuss
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Which organ is bypassed during fetal circulation in humans via the Foramen Ovale

A
Liver
B
Lungs
C
Kidneys
D
Brain

Answer & Explanation

Correct Option: B

In a fetus, lungs are non-functional; blood shifts from right to left atrium through the foramen ovale, bypassing pulmonary circulation.
Question 307 Discuss
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The 'Suicidal Bags' of the cell are

A
Ribosomes
B
Golgi bodies
C
Lysosomes
D
Nucleolus

Answer & Explanation

Correct Option: C

Lysosomes contain hydrolytic enzymes that can digest the entire cell if the membrane ruptures.
Question 308 Discuss
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Which of the following describes the 'Bohr Effect' in physiology

A
Increase in CO2 leads to decreased affinity of hemoglobin for oxygen
B
Increase in O2 leads to decreased affinity of hemoglobin for CO2
C
Effect of pressure on solubility of gases in blood
D
Movement of chloride ions into RBCs

Answer & Explanation

Correct Option: A

The Bohr effect explains how high CO2 and low pH in tissues facilitate oxygen unloading from hemoglobin.
Question 309 Discuss
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In Mendel's experiments the recessive trait is expressed only in

A
Heterozygous condition
B
Homozygous condition
C
F1 generation always
D
Both homozygous and heterozygous conditions

Answer & Explanation

Correct Option: B

Recessive alleles (like 't') can only manifest their phenotype if the dominant allele ('T') is absent (i.e., 'tt').
Question 310 Discuss
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Which among the following is the largest gland in the human body

A
Thyroid
B
Pancreas
C
Liver
D
Adrenal

Answer & Explanation

Correct Option: C

The liver is the largest gland, while the pancreas is the second largest.
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