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Biology MCQs

20 Questions Subject Test
Subject Preparation Guide

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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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1
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Which structure in plant cells is responsible for storing water and maintaining turgor pressure?

  • A Chloroplast
  • B Nucleus
  • C Mitochondria
  • D Vacuole
2
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What is the term for the smallest unit of heredity that determines a trait?

  • A Chromosome
  • B Allele
  • C Genome
  • D Gene
3
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Which organ produces insulin to regulate blood sugar levels?

  • A Liver
  • B Kidney
  • C Pancreas
  • D Spleen
4
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Photosynthesis primarily occurs in which part of a plant cell?

  • A Chloroplast
  • B Mitochondria
  • C Nucleus
  • D Vacuole
5
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What is the term for the sequence of organisms through which energy flows in an ecosystem?

  • A Food web
  • B Trophic level
  • C Biomass pyramid
  • D Food chain
6
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Which system in the human body is responsible for movement and support?

  • A Digestive system
  • B Circulatory system
  • C Nervous system
  • D Skeletal and muscular system
7
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The human heart has how many chambers?

  • A Four
  • B Two
  • C Three
  • D Five
8
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Which hormone regulates the body's metabolic rate?

  • A Insulin
  • B Thyroxine
  • C Adrenaline
  • D Estrogen
9
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What is the term for the process of shedding an outer layer of skin, exoskeleton, or other covering?

  • A Metamorphosis
  • B Regeneration
  • C Hibernation
  • D Molting
10
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What is the term for the study of interactions between organisms and their environment?

  • A Ecology
  • B Genetics
  • C Taxonomy
  • D Physiology
11
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Which type of teeth are primarily used for tearing meat in carnivorous animals?

  • A Incisors
  • B Molars
  • C Premolars
  • D Canines
12
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Which vitamin deficiency causes the disease scurvy?

  • A Vitamin A
  • B Vitamin B12
  • C Vitamin C
  • D Vitamin D
13
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What is the term for the maximum population size an environment can sustainably support?

  • A Carrying capacity
  • B Population density
  • C Biomass
  • D Growth rate
14
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What is the term for species that have adapted to survive in extremely harsh environments?

  • A Extremophiles
  • B Endemic species
  • C Invasive species
  • D Keystone species
15
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Which structure in the cell is responsible for protein synthesis?

  • A Mitochondria
  • B Ribosome
  • C Golgi apparatus
  • D Lysosome
16
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Which reproductive method involves the fusion of male and female gametes?

  • A Asexual reproduction
  • B Budding
  • C Sexual reproduction
  • D Binary fission
17
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What is the term for a genetically determined characteristic passed from parent to offspring?

  • A Trait
  • B Mutation
  • C Phenotype
  • D Adaptation
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What is the term for the loss of water and electrolytes from the body?

  • A Osmosis
  • B Diffusion
  • C Homeostasis
  • D Dehydration
19
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Which part of the human brain controls balance and coordination?

  • A Cerebrum
  • B Medulla oblongata
  • C Cerebellum
  • D Hypothalamus
20
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What is the term for the variety of life in a particular habitat?

  • A Population
  • B Ecosystem
  • C Community
  • D Biodiversity
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