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Biology MCQs

128 Questions Subject Test
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Build a clear understanding of living organisms, cells, genetics, human systems and the environment through carefully selected practice questions.

Cell BiologyHuman PhysiologyGeneticsEcology
Useful for academic exams, entry tests, FPSC, PPSC and general science preparation.
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121
Hard css fpsc Uploaded: 05 Aug 2026

Which organelle within the nucleus is responsible for producing ribosomal RNA?

  • A Centrosome
  • B Nucleolus
  • C Centriole
  • D Golgi body
Permalink
Correct Answer: Option B — Nucleolus
Explanation: The nucleolus is a dense region within the nucleus responsible for producing ribosomal RNA and assembling ribosome subunits that are then exported to the cytoplasm for protein synthesis.
Submitted by: PaperMCQs
122
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which gas is released by plants as a byproduct of photosynthesis?

  • A Carbon dioxide
  • B Nitrogen
  • C Oxygen
  • D Water vapour
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Correct Answer: Option C — Oxygen
Explanation: Oxygen is released as a byproduct of photosynthesis during the light-dependent reactions when water molecules are split through photolysis providing electrons to replace those lost by chlorophyll.
Submitted by: PaperMCQs
123
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the deficiency disease caused by lack of Vitamin D in children?

  • A Scurvy
  • B Rickets
  • C Beriberi
  • D Pellagra
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Correct Answer: Option B — Rickets
Explanation: Rickets is caused by Vitamin D deficiency in children leading to impaired calcium and phosphorus absorption resulting in weak soft and deformed bones.
Submitted by: PaperMCQs
124
Medium css fpsc ppsc Uploaded: 14 Jul 2026

What is the term for the variety of different species present in a given habitat?

  • A Genetic diversity
  • B Species diversity
  • C Ecosystem diversity
  • D Biodiversity
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Correct Answer: Option B — Species diversity
Explanation: Species diversity refers to the number and relative abundance of different species present in a given habitat and is an important measure of the biodiversity of an ecosystem.
Submitted by: PaperMCQs
125
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which type of reproduction involves only one parent and produces genetically identical offspring?

  • A Sexual reproduction
  • B Budding only
  • C Cross-pollination
  • D Asexual reproduction
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Correct Answer: Option D — Asexual reproduction
Explanation: Asexual reproduction involves a single parent producing genetically identical offspring through processes such as binary fission budding fragmentation or vegetative propagation.
Submitted by: PaperMCQs
126
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the term for the growth of plant roots downward in response to gravity?

  • A Phototropism
  • B Geotropism
  • C Hydrotropism
  • D Thigmotropism
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Correct Answer: Option B — Geotropism
Explanation: Geotropism is the directional growth response of plant roots toward the pull of gravity ensuring they penetrate the soil to anchor the plant and absorb water and nutrients.
Submitted by: PaperMCQs
127
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the basic structural and functional unit of all living organisms?

  • A Tissue
  • B Organ
  • C Nucleus
  • D Cell
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Correct Answer: Option D — Cell
Explanation: The cell is the basic structural and functional unit of all living organisms as proposed in the cell theory formulated by Schleiden Schwann and Virchow in the 19th century.
Submitted by: PaperMCQs
128
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which type of disease is caused by a deficiency of essential nutrients in the diet?

  • A Communicable disease
  • B Hereditary disease
  • C Autoimmune disease
  • D Deficiency disease
Permalink
Correct Answer: Option D — Deficiency disease
Explanation: Deficiency diseases result from the lack of essential nutrients in the diet such as vitamins and minerals causing conditions like scurvy rickets anaemia and goitre.
Submitted by: PaperMCQs
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