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 431 Discuss
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Which of the following describes 'Aneuploidy'

A
Presence of an exact multiple of the haploid set
B
Loss or gain of one or more individual chromosomes
C
Exchange of segments between non-homologous chromosomes
D
Complete set of chromosomes from two different species

Answer & Explanation

Correct Option: B

Aneuploidy results from non-disjunction during meiosis, e.g., Trisomy 21.
Question 432 Discuss
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The 'Lenticels' in woody plants are primarily used for

A
Photosynthesis
B
Water absorption
C
Gaseous exchange
D
Sugar transport

Answer & Explanation

Correct Option: C

Lenticels are porous tissues in the bark that allow for the exchange of gases between the atmosphere and the internal tissues.
Question 433 Discuss
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Which among the following is a 'Polysaccharide'

A
Glucose
B
Sucrose
C
Glycogen
D
Lactose

Answer & Explanation

Correct Option: C

Glycogen is a complex carbohydrate and is the primary storage form of glucose in animals.
Question 434 Discuss
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Identify the 'Double-Membrane' bound organelle from the following

A
Lysosome
B
Ribosome
C
Nucleus
D
Vacuole

Answer & Explanation

Correct Option: C

The nucleus, mitochondria, and chloroplasts are the only organelles with two surrounding membranes.
Question 435 Discuss
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The movement of 'Stomata' is regulated by the movement of ions into and out of

A
Subsidiary cells
B
Guard cells
C
Epidermal cells
D
Mesophyll cells

Answer & Explanation

Correct Option: B

Influx of K+ ions into guard cells increases turgor pressure, causing the stomatal pore to open.
Question 436 Discuss
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Which disease is known as the 'Breakbone Fever'

A
Malaria
B
Dengue
C
Chikungunya
D
Typhoid

Answer & Explanation

Correct Option: B

Dengue fever is called breakbone fever because of the severe joint and muscle pain it causes.
Question 437 Discuss
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The 'Primary Endosperm Nucleus' in angiosperms is

A
Haploid
B
Diploid
C
Triploid
D
Tetraploid

Answer & Explanation

Correct Option: C

Endosperm (3n) is formed by the fusion of one male gamete (n) with two polar nuclei (2n).
Question 438 Discuss
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Which of the following describes the 'All-or-None' law in physiology

A
A muscle fiber contracts completely or not at all in response to a threshold stimulus
B
Every neuron in a nerve fires simultaneously
C
The strength of a heart beat is independent of the stimulus
D
A cell produces all its enzymes at once

Answer & Explanation

Correct Option: A

Once a threshold stimulus is reached, the muscle fiber (or neuron) generates a full response.
Question 439 Discuss
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Which of the following is the 'Fastest' way of CO2 transport in the blood

A
As dissolved CO2 in plasma
B
As Bicarbonate ions
C
As Carbaminohemoglobin
D
As Carbon Monoxide

Answer & Explanation

Correct Option: B

About 70% of CO2 is transported as bicarbonate (HCO3-) ions.
Question 440 Discuss
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Identify the 'Connecting Link' between Annelida and Arthropoda

A
Peripatus
B
Neopilina
C
Echidna
D
Balanoglossus

Answer & Explanation

Correct Option: A

Peripatus (Velvet worm) has segmented bodies and nephridia (Annelid) and jointed legs and tracheal breathing (Arthropod).
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