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PPSC MCQs

Punjab Public Service Commission — Complete MCQ Bank

1,262 Questions
Exam Preparation Guide

How to prepare for PPSC

PPSC examinations recruit candidates for Punjab government departments and commonly test general knowledge, current affairs, English and post-related subjects.

Punjab AffairsGeneral KnowledgeCurrent AffairsEnglish
Give special attention to Punjab geography, history and administration alongside the advertised post’s specialist syllabus.
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All Subjects Biology Chemistry Computer Science Current Affairs English Everyday Science General Knowledge Islamic Studies Mathematics Pakistan Studies Physics
171
Biology Medium

What is the term for a community of organisms interacting with their physical environment?

  • ABiome
  • BPopulation
  • CEcosystem
  • DCommunity
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Correct Answer: Option C — Ecosystem
Explanation: An ecosystem is a biological community of interacting organisms together with the physical environment in which they live including both biotic living and abiotic non-living components.
Submitted by: PaperMCQs
172
Biology Medium

What is the term for all the populations of different species living and interacting in the same area?

  • ACommunity
  • BPopulation
  • CBiosphere
  • DEcosystem
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Correct Answer: Option A — Community
Explanation: A community is an assemblage of populations of different species that live and interact in the same geographical area at a given time sharing resources and affecting each other.
Submitted by: PaperMCQs
173
Biology Medium

What is the term for all the organisms of the same species living in the same area at the same time?

  • ACommunity
  • BEcosystem
  • CPopulation
  • DBiome
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Correct Answer: Option C — Population
Explanation: A population is a group of individuals of the same species living in the same area at the same time who can interbreed and share genetic resources.
Submitted by: PaperMCQs
174
Biology Medium

What is the term for an interconnected network of food chains in an ecosystem?

  • APyramid of biomass
  • BTrophic level
  • CFood web
  • DFood chain
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Correct Answer: Option C — Food web
Explanation: A food web is a complex network of interconnected food chains in an ecosystem representing the multiple feeding relationships and energy pathways between organisms.
Submitted by: PaperMCQs
175
Biology Easy

What is the term for the sequence of feeding relationships in an ecosystem?

  • APyramid of numbers
  • BEcological niche
  • CTrophic level
  • DFood chain
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Correct Answer: Option D — Food chain
Explanation: A food chain is a linear sequence showing how energy and nutrients are transferred from one organism to another through feeding relationships starting from producers.
Submitted by: PaperMCQs
176
Biology Medium

Which type of nutrition involves organisms that feed on dead and decaying organic matter?

  • ASaprotrophic
  • BAutotrophic
  • CHolozoic
  • DParasitic
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Correct Answer: Option A — Saprotrophic
Explanation: Saprotrophic nutrition involves organisms such as fungi and bacteria secreting digestive enzymes onto dead organic matter and absorbing the digested nutrients playing a key role in decomposition.
Submitted by: PaperMCQs
177
Biology Medium

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

  • APhototropism
  • BGeotropism
  • CHydrotropism
  • DThigmotropism
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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
178
Biology Medium

What is the term for the bending of a plant toward light called?

  • AGeotropism
  • BPhototropism
  • CHydrotropism
  • DThigmotropism
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Correct Answer: Option B — Phototropism
Explanation: Phototropism is the growth response of a plant toward a light source caused by unequal distribution of auxin making cells on the shaded side elongate more than those on the lit side.
Submitted by: PaperMCQs
179
Biology Medium

Which type of tissue in plants transports dissolved food from leaves to other parts?

  • APhloem
  • BCambium
  • CXylem
  • DEpidermis
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Correct Answer: Option A — Phloem
Explanation: Phloem is the vascular tissue in plants responsible for transporting dissolved sugars and other organic compounds produced during photosynthesis from leaves to all parts of the plant.
Submitted by: PaperMCQs
180
Biology Medium

Which type of tissue in plants transports water and minerals from roots to leaves?

  • APhloem
  • BCambium
  • CEpidermis
  • DXylem
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Correct Answer: Option D — Xylem
Explanation: Xylem is the vascular tissue in plants that transports water and dissolved minerals from the roots upward through the stem to the leaves through a process driven by transpiration.
Submitted by: PaperMCQs
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