Join WhatsApp ChannelDaily MCQs & Exam Updates

Biology MCQs

121 Questions Subject Test
Subject Preparation Guide

Prepare Biology with confidence

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.
Biology preparation illustration
Subject Test

Test your Biology preparation

Questions are tracked as practiced when you open Show Answer & Explanation. Tracking stays only in this browser tab and no subject-test result is saved.

Practiced MCQs
0 / 121
Use the MCQs you already prepared, or launch a random test from the full subject bank.
No login required Result is not saved Choose your own MCQ count & timer
Choose your test mode
Choose any number up to 121 available MCQs.
Enter 0 for no timer, or choose 1–300 minutes.
Tip: prepare some MCQs first, then start a quick self-check from My Practiced MCQs to test exactly what you studied.
101
Medium fpsc Uploaded: 06 Aug 2026

Which part of the respiratory system is the primary site of gas exchange?

  • A Alveoli
  • B Trachea
  • C Bronchi
  • D Larynx
Permalink
Correct Answer: Option A — Alveoli
Explanation: Alveoli are tiny, thin-walled air sacs in the lungs where oxygen from inhaled air diffuses into the blood while carbon dioxide diffuses out. Their vast surface area and thin walls maximize efficient gas exchange.
Submitted by: PaperMCQs
102
Medium ppsc Uploaded: 06 Aug 2026

Which gland is known as the master gland of the endocrine system?

  • A Thyroid
  • B Adrenal
  • C Pancreas
  • D Pituitary
Permalink
Correct Answer: Option D — Pituitary
Explanation: The pituitary gland, located at the base of the brain, regulates other endocrine glands by secreting hormones that control growth, metabolism, and reproduction. Its central regulatory role earns it the title of master gland.
Submitted by: PaperMCQs
103
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

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

  • A Pyramid of biomass
  • B Trophic level
  • C Food web
  • D Food chain
Permalink
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
104
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which type of cell division produces gametes with half the chromosome number?

  • A Budding
  • B Meiosis
  • C Mitosis
  • D Binary fission
Permalink
Correct Answer: Option B — Meiosis
Explanation: Meiosis is the type of cell division that produces four genetically diverse gametes each containing half the chromosome number of the parent cell ensuring genetic diversity in sexual reproduction.
Submitted by: PaperMCQs
105
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What term describes the specific molecule an enzyme acts upon?

  • A Substrate
  • B Product
  • C Cofactor
  • D Coenzyme
Permalink
Correct Answer: Option A — Substrate
Explanation: The substrate is the specific molecule upon which an enzyme acts binding at the active site to form an enzyme-substrate complex and being converted into products.
Submitted by: PaperMCQs
106
Medium css fpsc ppsc Uploaded: 14 Jul 2026

What is the process by which white blood cells engulf and digest bacteria and foreign particles?

  • A Phagocytosis
  • B Endocytosis
  • C Osmosis
  • D Pinocytosis
Permalink
Correct Answer: Option A — Phagocytosis
Explanation: Phagocytosis is the process by which phagocytes such as neutrophils and macrophages engulf and digest bacteria foreign particles and dead cells protecting the body from infection.
Submitted by: PaperMCQs
107
Medium ppsc Uploaded: 06 Aug 2026

Which organ in the human body is primarily responsible for detoxifying harmful substances?

  • A Kidney
  • B Spleen
  • C Pancreas
  • D Liver
Permalink
Correct Answer: Option D — Liver
Explanation: The liver plays a central role in detoxifying harmful substances, metabolizing drugs, and breaking down toxins from the bloodstream. It also produces bile for fat digestion and stores essential vitamins and glycogen reserves.
Submitted by: PaperMCQs
108
Medium pms Uploaded: 06 Aug 2026

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

  • A Chloroplast
  • B Nucleus
  • C Mitochondria
  • D Vacuole
Permalink
Correct Answer: Option D — Vacuole
Explanation: The central vacuole in plant cells stores water, nutrients, and waste products while maintaining internal pressure against the cell wall. This turgor pressure keeps plant tissues rigid and helps support the overall plant structure.
Submitted by: PaperMCQs
109
Medium css fpsc ppsc Uploaded: 14 Jul 2026

What is the process by which cells engulf large particles by wrapping the cell membrane around them?

  • A Phagocytosis
  • B Osmosis
  • C Diffusion
  • D Pinocytosis
Permalink
Correct Answer: Option A — Phagocytosis
Explanation: Phagocytosis is a type of endocytosis where the cell membrane wraps around large solid particles such as bacteria and engulfs them forming a phagosome inside the cell.
Submitted by: PaperMCQs
110
Medium css Uploaded: 06 Aug 2026

Which part of the digestive system primarily absorbs nutrients into the bloodstream?

  • A Stomach
  • B Large intestine
  • C Small intestine
  • D Esophagus
Permalink
Correct Answer: Option C — Small intestine
Explanation: The small intestine, lined with finger-like projections called villi, provides a large surface area for absorbing digested nutrients including carbohydrates, proteins, and fats directly into the bloodstream for distribution throughout the body.
Submitted by: PaperMCQs
111
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the term for the movement of water from a region of high water concentration to low concentration through a semipermeable membrane?

  • A Diffusion
  • B Osmosis
  • C Active transport
  • D Endocytosis
Permalink
Correct Answer: Option B — Osmosis
Explanation: Osmosis is the movement of water molecules through a semipermeable membrane from a region of high water potential to low water potential without requiring energy.
Submitted by: PaperMCQs
112
Medium css Uploaded: 06 Aug 2026

What is the term for the sum of all chemical reactions occurring within an organism?

  • A Metabolism
  • B Homeostasis
  • C Catabolism
  • D Anabolism
Permalink
Correct Answer: Option A — Metabolism
Explanation: Metabolism encompasses all chemical reactions occurring within a living organism, including both the breakdown of molecules to release energy and the building of complex molecules necessary for growth, repair, and cellular function.
Submitted by: PaperMCQs
113
Medium nts Uploaded: 06 Aug 2026

What is the term for plants that complete their life cycle in one year?

  • A Perennial
  • B Biennial
  • C Deciduous
  • D Annual
Permalink
Correct Answer: Option D — Annual
Explanation: Annual plants germinate, grow, flower, produce seeds, and die within a single growing season. Common examples include many vegetables and garden flowers, which must be replanted each year from seed to continue their cycle.
Submitted by: PaperMCQs
114
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which hormone regulates blood glucose levels by promoting its uptake by cells?

  • A Glucagon
  • B Adrenaline
  • C Thyroxine
  • D Insulin
Permalink
Correct Answer: Option D — Insulin
Explanation: Insulin produced by the beta cells of the pancreas lowers blood glucose levels by promoting its uptake by body cells and stimulating its conversion to glycogen in the liver.
Submitted by: PaperMCQs
115
Medium css fpsc ppsc Uploaded: 14 Jul 2026

Which process copies DNA information into mRNA in the nucleus?

  • A Translation
  • B Replication
  • C Transduction
  • D Transcription
Permalink
Correct Answer: Option D — Transcription
Explanation: Transcription is the process by which the information in a DNA sequence is copied into mRNA by the enzyme RNA polymerase taking place in the nucleus of eukaryotic cells.
Submitted by: PaperMCQs
116
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
Permalink
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
117
Medium ppsc Uploaded: 06 Aug 2026

What is the term for the specialized cells that transmit electrical impulses in the nervous system?

  • A Muscle cells
  • B Epithelial cells
  • C Blood cells
  • D Neurons
Permalink
Correct Answer: Option D — Neurons
Explanation: Neurons are specialized cells designed to transmit electrical and chemical signals throughout the nervous system. They consist of a cell body, dendrites for receiving signals, and an axon for sending impulses to other cells.
Submitted by: PaperMCQs
118
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
Permalink
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
119
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
Permalink
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
120
Medium css Uploaded: 06 Aug 2026

What is the term for a substance that speeds up chemical reactions in living organisms?

  • A Enzyme
  • B Hormone
  • C Vitamin
  • D Antibody
Permalink
Correct Answer: Option A — Enzyme
Explanation: Enzymes are biological catalysts, mostly proteins, that speed up specific chemical reactions without being consumed in the process. They lower the activation energy required for reactions, enabling essential metabolic processes to occur efficiently.
Submitted by: PaperMCQs
Practiced MCQs0 / 121