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 131 Discuss
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According to sympatric speciation, the rising of a new species occurs when:

A
organisms from the same species start to show different behavioural characteristics
B
one species is separated into different groups due to geologic events like mountain formation
C
the two groups of organisms from the same species would phenotypically look different
D
two groups of the same species cannot interbreed among themselves despite living in the same geographic location

Answer & Explanation

Correct Option: D

Sympatric speciation is the evolutionary process that occurs strictly when neighboring populations of a single species that share the exact same physical habitat somehow become deeply reproductively isolated from one another.
Question 132 Discuss
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Anorexia Nervosa is an eating disorder characterised by: a) Overeating b) Loss of appetite c) Fear of gaining weight d) Distorted body image

A
c and d
B
a and c
C
b and c
D
a and b

Answer & Explanation

Correct Option: A

Clinically, anorexia nervosa primarily involves an intense, pathological psychological fear of gaining any weight, paired directly with a persistently distorted perception of one's own bodily shape and size.
Question 133 Discuss
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Which of the following are edible polysaccharides?

A
Sucrose, glucose and cellulose
B
Cellulose, chitin and myosin
C
Methyl cellulose, chitin and actin
D
Starch, alginates, pectins and chitosans

Answer & Explanation

Correct Option: D

Starch, alginates, pectins, and chitosans are broadly categorized as complex, biologically non-toxic polysaccharides that can be safely consumed by humans, serving either as direct energy sources or beneficial dietary fiber.
Question 134 Discuss
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Which organelle contains ribosomal RNA and is involved in the production of ribosomes?

A
Golgi apparatus
B
Nucleus
C
Endoplasmic reticulum
D
Nucleolus

Answer & Explanation

Correct Option: D

The nucleolus is a visually prominent, non-membrane-bound dense region situated deep within the nucleus where essential ribosomal RNA is rapidly synthesized and physically assembled with structural proteins to form ribosomes.
Question 135 Discuss
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Cyanobacteria belong to the domain of:

A
Primary Consumers
B
Producers
C
Decomposers
D
Tertiary Consumers

Answer & Explanation

Correct Option: B

Evolutionarily ancient cyanobacteria are strictly photosynthetic autotrophs, meaning they independently produce their own complex organic food from sunlight and serve as foundational biological producers across diverse aquatic ecosystems.
Question 136 Discuss
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Muscle cells and muscle fibres are developed from embryonic precursor cells known as:

A
myonuclei
B
myocyte
C
myofibril
D
myoblasts

Answer & Explanation

Correct Option: D

During early embryonic myogenesis, highly specialized but still undifferentiated progenitor cells termed myoblasts aggressively fuse together end-to-end to eventually form the long, mature, multinucleated muscle fibers of the body.
Question 137 Discuss
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Gluten formation is observed in various foods like pasta, noodles, pizzas, and bread. Gluten occurs when two specific proteins are mixed with water. Name the two proteins responsible for gluten formation.

A
Glutenin and Albumin
B
Glutenin and Glycine
C
Glutenin and Gliadin
D
Glutenin and Casein

Answer & Explanation

Correct Option: C

When the refined proteins present in wheat flour are physically hydrated and kneaded with water, the structural proteins glutenin and gliadin interlink to form the dense, highly elastic protein network formally known as gluten.
Question 138 Discuss
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What is the term for the gradual, sequential changes in species composition in an ecosystem over time?

A
Extinction
B
Succession
C
Evolution
D
Adaptation

Answer & Explanation

Correct Option: B

Ecological succession strictly refers to the highly progressive, theoretically predictable process by which the overall biological structure and dominant species composition of a localized community change and evolve over significant periods of time.
Question 139 Discuss
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Find the odd one out. Vacuoles, Lysosomes Nucleus, Ribosomes,

A
Nucleus
B
Vacuoles
C
Ribosomes
D
Lysosomes

Answer & Explanation

Correct Option: C

Unlike vacuoles, lysosomes, and the defining nucleus, which are all distinct, classically membrane-bound cellular organelles, tiny ribosomes completely lack a surrounding lipid membrane.
Question 140 Discuss
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Which of the following are the amounts of nutrients in a keto diet?

A
Only taking high number of vitamins and minerals
B
High protein and fat, carbohydrates in a low amount
C
High carbohydrate, proper amount of protein and low fat
D
High amount of fat, adequate protein and low carbohydrate

Answer & Explanation

Correct Option: D

The metabolic ketogenic diet biologically forces the human body into ketosis to heavily burn fats rather than carbohydrates by severely restricting daily carb intake and significantly increasing the overall consumption of dietary fats.
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