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 181 Discuss
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Interspecific interaction between two species, in which both members benefit, is referred to as:

A
neutralism
B
commensalism
C
mutualism
D
uniquely

Answer & Explanation

Correct Option: C

Mutualism is a biological interaction where both interacting species derive a fitness benefit. A classic example is the relationship between bees and flowering plants, where bees get nectar and plants get pollinated.
Question 182 Discuss
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Which of the following is generally NOT considered an essential macronutrient for most terrestrial plants?

A
Calcium
B
Potassium
C
Magnesium
D
Sodium

Answer & Explanation

Correct Option: D

While calcium, potassium, and magnesium are essential macronutrients required for various plant physiological functions, sodium is generally not considered an essential element for most terrestrial plants.
Question 183 Discuss
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Who is famous for discovering the random movement of microscopic particles in a fluid, now known as Brownian motion?

A
Watson
B
Robert Brown
C
Anton van Leeuwenhoek
D
Robert Hook

Answer & Explanation

Correct Option: B

In 1827, botanist Robert Brown observed pollen grains moving randomly in water under a microscope. This phenomenon, later explained by Albert Einstein as evidence of atoms, is known as Brownian motion.
Question 184 Discuss
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Milk is a notoriously poor source of which vitamin?

A
A
B
C
C
B
D
D

Answer & Explanation

Correct Option: B

While milk is naturally rich in calcium, vitamin D, and various B vitamins, it is deficient in Vitamin C (ascorbic acid). Pasteurization processes further destroy any negligible amounts of Vitamin C present.
Question 185 Discuss
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Who used a home-made microscope to discover the invisible world of microbes, for which he is called the founding father of microbiology?

A
Antoni van Leeuwenhoek
B
Matthias Schleiden
C
Rudolf Virchow
D
Robert Brown

Answer & Explanation

Correct Option: A

Antoni van Leeuwenhoek, a Dutch scientist, was the first to observe and precisely describe single-celled organisms, which he called 'animalcules,' using handcrafted microscopes in the 1670s.
Question 186 Discuss
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Which of the following cellular structures is primarily responsible for protein synthesis?

A
Ribosomes
B
Golgi apparatus
C
Cell membrane
D
Nucleus

Answer & Explanation

Correct Option: A

Ribosomes are the molecular machines within all living cells that perform biological protein synthesis. They read messenger RNA sequences to assemble amino acids into functional polypeptide chains.
Question 187 Discuss
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Which of the following statements about animal hearts is INCORRECT?

A
Crocodiles have four heart chambers.
B
Birds have four-chambered heart.
C
Fishes have two chambered heart.
D
Frogs have four-chambered heart.

Answer & Explanation

Correct Option: D

Frogs, being amphibians, have a three-chambered heart consisting of two atria and one ventricle. In contrast, birds, mammals, and crocodilians have a fully divided four-chambered heart.
Question 188 Discuss
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Which of the following describes centrioles?

A
a heterogeneous family of organelles found ubiquitously in plant cells
B
a membrane-bound cell organelle that contains digestive enzymes
C
a paired barrel-shaped organelle located in the cytoplasm of animal cells near the nuclear envelope
D
a stack of small flat sacs formed by membranes inside the cell's cytoplasm

Answer & Explanation

Correct Option: C

Centrioles are paired, barrel-shaped organelles found in the cytoplasm of animal cells that play a crucial role in organizing microtubules during cell division and forming the spindle apparatus.
Question 189 Discuss
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Which of the below is a psychological disorder of refusal to eat food, caused by a distorted perception of weight?

A
Bulimia Nervosa
B
Anorexia Nervosa
C
Marasmus
D
Kwashiorkor

Answer & Explanation

Correct Option: B

Anorexia nervosa is an eating disorder characterized by abnormally low body weight, an intense fear of gaining weight, and a distorted body image, leading to severe self-induced starvation.
Question 190 Discuss
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Choose the INCORRECT statement about lichens.

A
Fungi and cyanobacteria both lives in lichens independently.
B
Lichens contains cyanobacteria.
C
Lichens are seen slow-growing large coloured patches on the bark of trees.
D
Fungi are found in lichen living a symbiotic life.

Answer & Explanation

Correct Option: A

In a lichen, the fungus and the photosynthetic partner (algae or cyanobacteria) do not live independently; they exist in a highly integrated, mutualistic symbiotic relationship to survive in harsh conditions.
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