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 381 Discuss
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The 'Poliomyelitis' virus primarily attacks which system of the human body

A
Respiratory system
B
Digestive system
C
Nervous system
D
Excretory system

Answer & Explanation

Correct Option: C

Polio virus targets motor neurons in the spinal cord, potentially leading to muscle weakness and paralysis.
Question 382 Discuss
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What is the function of the 'Casparian Strip' in plant roots

A
To increase water absorption area
B
To force water and minerals to enter the vascular cylinder through the protoplast
C
To store starch for the plant
D
To allow for gaseous exchange

Answer & Explanation

Correct Option: B

The waxy Casparian strip in the endodermis blocks apoplastic flow, ensuring selective absorption.
Question 383 Discuss
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Which enzyme in the human saliva is responsible for the hydrolysis of starch into maltose

A
Pepsin
B
Lipase
C
Salivary Amylase
D
Trypsin

Answer & Explanation

Correct Option: C

Also known as Ptyalin, salivary amylase begins the chemical digestion of carbohydrates in the mouth.
Question 384 Discuss
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Statement I Mitosis results in two identical daughter cells Statement II Meiosis results in four haploid genetically diverse daughter cells

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

Answer & Explanation

Correct Option: C

Mitosis is for growth/repair (cloning), while meiosis is for gamete formation (introducing variation).
Question 385 Discuss
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Which of the following is known as the 'Graveyard of RBCs'

A
Liver
B
Spleen
C
Kidney
D
Bone Marrow

Answer & Explanation

Correct Option: B

Old and damaged red blood cells are filtered out and destroyed in the spleen.
Question 386 Discuss
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The conversion of Nitrate to atmospheric Nitrogen by bacteria is called

A
Nitrification
B
Denitrification
C
Ammonification
D
Nitrogen Fixation

Answer & Explanation

Correct Option: B

Denitrifying bacteria like Pseudomonas convert nitrates back into N2 gas, completing the nitrogen cycle.
Question 387 Discuss
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A person with 'Hypermetropia' cannot see nearby objects clearly because the image is formed

A
In front of the retina
B
Behind the retina
C
Exactly on the blind spot
D
On the optic nerve

Answer & Explanation

Correct Option: B

In farsightedness, the eyeball is too short or the lens is too flat, causing light to focus behind the retina.
Question 388 Discuss
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Which among the following hormones is called the 'Emergency Hormone'

A
Insulin
B
Thyroxine
C
Adrenaline
D
Estrogen

Answer & Explanation

Correct Option: C

Adrenaline (Epinephrine) prepares the body for quick action during stressful or dangerous situations.
Question 389 Discuss
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The 'U-shaped' part of the nephron that plays a role in water conservation is

A
Proximal tubule
B
Loop of Henle
C
Collecting duct
D
Glomerulus

Answer & Explanation

Correct Option: B

The Loop of Henle creates a concentration gradient in the kidney medulla, allowing for water reabsorption.
Question 390 Discuss
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Identify the vector for the disease 'Yellow Fever'

A
Anopheles mosquito
B
Aedes aegypti
C
Culex mosquito
D
Tsetse fly

Answer & Explanation

Correct Option: B

Yellow fever is a viral disease transmitted to humans by the bite of infected Aedes or Haemagogus mosquitoes.
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