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JKCET Biology — practice by topic

Browse 425 questions across 112 Biology topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Biology topics

Molecular Basis of Inheritance (51)Sexual Reproduction in Flowering Plants (45)Human Reproduction (40)Cell Cycle and Cell Division (36)Principles of Inheritance and Variation (32)Principles Of Inheritance (30)Reproductive Health (30)Human Health and Disease (26)Inheritance and Variation (23)Reproduction in Lower and Higher Animals (22)Origin and Evolution (17)Plant Water Relations (16)Photosynthesis in Higher Plants (13)Cell Biology (12)Cell Structure (12)Cell: The Unit of Life (12)Biotechnology: Principles and Processes (11)Plant Growth (10)Locomotion and Movement (8)Biomolecules (7)Chemical Coordination and Integration (7)Excretory Products (7)Excretory Products and their Elimination (7)Genetic Code (6)Human Health (6)Biology (5)Microbes in Human Welfare (5)Asexual Reproduction (4)Darwinism (4)DNA Replication (4)Genetic Material (4)Female Reproductive System (3)Genetic Terminology (3)Menstrual Cycle (3)Mineral Nutrition (3)Translation (3)Autosomal Inheritance (2)Biological Classification (2)Biotechnology Applications (2)Central Dogma (2)Cytokinin (2)Dihybrid Cross (2)DPD (2)Genetic Drift (2)Lamarckism (2)Male Reproductive System (2)Mendelism (2)Monohybrid Cross (2)RNA World (2)Spermatogenesis (2)Transcription (2)Transpiration (2)Ascent of Sap (1)Auxin (1)Cancer Cell Biology (1)Cell Constant (1)Cell EMF (1)Chromosomal Theory (1)Coacervates (1)Co Dominance (1)

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**Reproduction** in animals is defined as:Read the answer and worked solution →In **asexual reproduction**, the daughter organisms produced from a single parent are:Read the answer and worked solution →**Gemmule formation** is an asexual reproductive method seen exclusively in:Read the answer and worked solution →External **budding** as a method of asexual reproduction is best illustrated by:Read the answer and worked solution →

Worked practice questions

**Reproduction** in animals is defined as:

  1. Growth of an organism from juvenile to adult
  2. Biological process of formation of new life from pre-existing similar life
  3. Daily metabolic activity needed for survival
  4. Repair or regrowth of lost body parts
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Correct answer: B. Biological process of formation of new life from pre-existing similar life

Reproduction is the biological process of forming new life forms from pre-existing similar life — it ensures continuity of species. Repair/regrowth is regeneration (distinct from reproduction).

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In **asexual reproduction**, the daughter organisms produced from a single parent are:

  1. Genetically diverse offspring
  2. Genetically identical clones
  3. Always sterile
  4. Always of the opposite sex
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Correct answer: B. Genetically identical clones

Asexual reproduction does not involve meiosis or gamete fusion. Single parent ⇒ daughters share the parent's genome exactly ⇒ they are clones.

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**Gemmule formation** is an asexual reproductive method seen exclusively in:

  1. Hydra
  2. Sponges (e.g. Spongilla)
  3. Planaria
  4. Amoeba
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Correct answer: B. Sponges (e.g. Spongilla)

Gemmules are internal buds of dormant archaeocytes coated by amoebocytes — they form **only in sponges** and survive unfavourable conditions. Hydra buds externally Planaria fragments; Amoeba undergoes binary fission.

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