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 581 Discuss
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Identify the 'Excretory' product of birds and reptiles

A
Ammonia
B
Urea
C
Uric Acid
D
Amino acids

Answer & Explanation

Correct Option: C

Uric acid is excreted as a paste, which minimizes water loss for these animals.
Question 582 Discuss
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Which part of the 'Nephron' is the site of maximum reabsorption of electrolytes and water

A
Proximal Convoluted Tubule (PCT)
B
Loop of Henle
C
Distal Convoluted Tubule
D
Collecting duct

Answer & Explanation

Correct Option: A

About 70-80% of electrolytes and water are reabsorbed in the PCT.
Question 583 Discuss
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The 'Basal Body' of cilia and flagella has a microtubule arrangement of

A
9+2
B
9+0
C
7+2
D
9+3

Answer & Explanation

Correct Option: B

The basal body follows a '9 triplets and zero center' arrangement, unlike the axoneme which is 9+2.
Question 584 Discuss
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Identify the correctly matched 'Gland' and its location

A
Thymus - Neck
B
Adrenal - Above kidneys
C
Pituitary - Abdomen
D
Thyroid - Chest

Answer & Explanation

Correct Option: B

Thyroid is in the neck, Pituitary in the brain, Thymus in the chest (behind sternum).
Question 585 Discuss
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In the human digestive system 'Enterokinase' is an enzyme that activates

A
Pepsinogen
B
Trypsinogen
C
Chymotrypsinogen
D
Procarboxypeptidase

Answer & Explanation

Correct Option: B

Enterokinase (enteropeptidase) converts trypsinogen into active trypsin in the duodenum.
Question 586 Discuss
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Which hormone is secreted in response to 'Hypocalcemia' to increase blood calcium

A
Calcitonin
B
Parathyroid Hormone (PTH)
C
Thyroxine
D
Aldosterone

Answer & Explanation

Correct Option: B

PTH stimulates bone breakdown and kidney reabsorption to restore calcium balance.
Question 587 Discuss
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The 'Ozone' layer thickness is measured in which units

A
Decibels
B
Dobson Units (DU)
C
Pascal
D
Millimeters

Answer & Explanation

Correct Option: B

One DU is the number of molecules of ozone that would be required to create a layer of pure ozone 0.01 millimeters thick.
Question 588 Discuss
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Identify the 'Tricky' part: Which of the following does 'NOT' have a nucleus

A
Mature mammalian RBC
B
Sieve tube cells in plants
C
WBC
D
Both A and B

Answer & Explanation

Correct Option: D

Both mature mammalian RBCs and sieve tube elements lose their nuclei to specialize for transport.
Question 589 Discuss
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In the process of 'Translation' the initiator amino acid in eukaryotes is

A
Valine
B
Methionine
C
Leucine
D
Glycine

Answer & Explanation

Correct Option: B

The start codon AUG codes for Methionine, which is the first amino acid in the polypeptide chain.
Question 590 Discuss
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The 'Islets of Langerhans' contain which cells for secreting Somatostatin

A
Alpha cells
B
Beta cells
C
Delta cells
D
PP cells

Answer & Explanation

Correct Option: C

Delta cells make up about 5-10% of the islet and regulate local hormone release.
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