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Q1. Vegetative propagation uses:
Roots, stems or leavesVegetative propagation is a form of asexual reproduction in plants that uses vegetative parts—roots (e.g., sweet potato), stems (e.g., potato, ginger, sugarcane), or leaves (e.g., Bryophyllum)—to produce new plants. Fruits, seeds, and flowers are reproductive parts, not vegetative parts, and are involved in sexual reproduction.
Q2. The thread-like structures in bread mould are:
HyphaeBread mould (Rhizopus) consists of long, branching, thread-like structures called hyphae. Hyphae form the mycelium, which spreads over the bread surface, absorbs nutrients, and bears sporangia at their tips. Sporangia are spherical structures containing spores; buds are seen in yeast; spores are reproductive units.
Q3. Regeneration requires cells that can:
Divide and differentiateRegeneration requires specialized cells (often stem cells or undifferentiated cells) that can first divide (proliferate) to increase cell numbers, and then differentiate (specialize) into various cell types (muscle, nerve, skin, etc.) to form a complete body part or a new organism. Without both abilities, regeneration cannot occur.
Q4. Vegetative propagation does not involve:
SeedsSeeds are products of sexual reproduction (formed after fertilization). Vegetative propagation, by definition, uses only vegetative plant parts—roots, stems, and leaves. Seeds are not involved in vegetative propagation, though they are the primary means of reproduction in many plants.
Q5. Layering and grafting are methods of:
Vegetative propagationLayering (bending a stem to the ground so it roots) and grafting (joining a scion from one plant to the rootstock of another) are artificial methods of vegetative propagation. They do not involve seeds, gametes, or fertilization, and produce offspring genetically identical to the parent plant.
Q6. Which structure helps Bryophyllum reproduce?
Leaf marginsBryophyllum (now often called Kalanchoe) reproduces vegetatively through adventitious buds that develop along the leaf margins (edges). These buds, called epiphyllous buds, fall off, land on soil, and grow into new plants. This is a unique and well-known example of vegetative propagation through leaves.
Q7. Plants produced by vegetative propagation bear flowers:
Earlier than seed-grown plantsVegetatively propagated plants are essentially clones of the mature parent plant and have already reached the developmental stage required for flowering. They bypass the juvenile (non-flowering) phase that seed-grown plants must go through. Therefore, they bear flowers and fruits earlier than plants grown from seeds.
Q8. Budding results in offspring that are:
Genetically similar to parentBudding is a form of asexual reproduction. The bud forms by mitosis from the parent cell or body, receiving an identical copy of the parent’s DNA. Therefore, offspring are genetically similar (clones) to the parent, barring rare mutations. They are not unrelated, not always smaller (they grow), and not necessarily sterile.
Q9. A major advantage of vegetative propagation is that offspring are:
Genetically similar to parentThe genetic similarity (clonal nature) of offspring in vegetative propagation is a major advantage in agriculture. Desirable traits—such as high yield, disease resistance, fruit quality, and flower color—are preserved unchanged across generations. Genetically different offspring (sexual reproduction) would not guarantee preservation of these traits.
Q10. Budding is a reproductive process seen in:
HydraHydra, a small freshwater cnidarian, reproduces asexually by budding. A small outgrowth (bud) forms on the parent’s body, develops tentacles and a mouth, and eventually detaches as a new individual. Planaria regenerates; Plasmodium undergoes multiple fission; Spirogyra fragments. Hydra is the classic example of budding in animals.
Q11. The mass of cells formed during tissue culture is called:
CallusIn plant tissue culture, explants (small pieces of plant tissue) are placed on nutrient medium with hormones. Undifferentiated cells divide rapidly to form an unorganized, lumpy mass of cells called a callus. The callus can then be induced to differentiate into roots, shoots, and eventually whole plants. A bud is an organized structure; a zygote is a fertilized egg; a spore is a reproductive cell.
Q12. Tissue culture involves growing plants from:
Plant tissue or cellsTissue culture (micropropagation) is a technique where a small piece of plant tissue (explant)—such as meristem, leaf disc, or stem segment—or even isolated single cells is grown aseptically on a nutrient medium to regenerate whole plants. It does not use fruits, flowers (directly), or seeds, though these can be sources of explants.
Q13. Spore formation is seen in:
RhizopusRhizopus (bread mould) reproduces asexually by producing haploid spores inside sporangia. Under favourable conditions, sporangia burst, releasing spores that germinate into new mycelia. Amoeba reproduces by fission; Hydra by budding; Planaria by regeneration. Spore formation is characteristic of many fungi like Rhizopus.
Q14. Banana and jasmine are commonly propagated by:
Vegetative propagationCommercial banana plants are seedless (triploid) and cannot reproduce by seeds. Jasmine (Chameli) also produces few seeds or takes too long. Both are propagated vegetatively—banana by suckers (stem offshoots) or rhizomes; jasmine by stem cuttings or layering. This ensures uniform, fast-growing, and fruit-bearing plants.
Q15. Tissue culture allows production of plants that are:
Disease-freeTissue culture uses small explants, often from meristematic tissue which is typically virus-free. By using sterile techniques and appropriate surface sterilization, plants produced are free from soil-borne pathogens, viruses, and fungi. This is a major advantage for producing healthy, disease-free planting material (e.g., virus-free potatoes, bananas).
Q16. Which method is best suited for rapid multiplication?
Spore formationSpore formation allows the production of millions of microscopic spores in a short time from a single organism. Each spore can germinate into a new individual under suitable conditions. This method (e.g., in Rhizopus, ferns, mosses) leads to extremely rapid multiplication compared to budding (one or few buds), regeneration (requires fragment growth), or sexual reproduction (slower, requires mating).
Q17. Budding in Hydra uses:
Regenerative cellsIn Hydra, budding involves interstitial cells (a type of stem cell) that are capable of repeated division and differentiation. These regenerative cells proliferate at the bud site, forming a small outgrowth that develops tentacles, a mouth, and a gastrovascular cavity. Spores, gametes, and seeds are not involved in Hydra’s budding.
Q18. In money plant, new plants develop from:
Stem pieces with leavesMoney plant (Epipremnum aureum, also called pothos) is commonly propagated by stem cuttings. A piece of stem containing nodes and leaves, when placed in water or soil, develops adventitious roots from the nodes and grows into a new plant. This is a form of vegetative propagation using stem pieces.
Q19. The formation of different tissues from cells during regeneration is called:
DevelopmentIn regeneration, after cells proliferate (divide), they undergo differentiation to form various specialized tissues (muscle, nerve, epidermis, etc.). This process of forming different tissues and organs is called development. Fertilisation is fusion of gametes; fission is cell division; fragmentation is breaking into pieces. Development encompasses tissue and organ formation.
Q20. Buds in Hydra develop due to:
Repeated cell divisionBudding in Hydra occurs when a group of cells (interstitial cells) at a specific site undergoes repeated mitotic divisions. This rapid cell proliferation creates a bulge (bud), which grows, develops tentacles and a mouth, and eventually detaches. Meiosis and fertilisation are involved in sexual reproduction, not budding. Tissue decay is destructive, not constructive.
Q21. Vegetative propagation helps in growing plants that:
Have lost seed-producing abilityMany cultivated plants (e.g., banana, sugarcane, potato, seedless grapes, orange varieties) are sterile or produce non-viable seeds due to polyploidy, hybrid nature, or genetic mutations. Vegetative propagation allows these plants to be multiplied indefinitely despite their inability to produce seeds. This is a key agricultural application.
Q22. Potato shows vegetative propagation through:
Notches or budsPotato (Solanum tuberosum) propagates vegetatively through tubers (modified stems). The “eyes” of a potato are notches containing buds (axillary buds). When a potato piece with an eye is planted, the bud sprouts, producing a new plant. Roots, flowers, and leaves (except the buds on tubers) are not the primary propagating structures in potato.
Q23. Which method gives rise to many individuals at once?
Spore formationSpore formation produces an enormous number of individuals simultaneously. A single sporangium in Rhizopus contains hundreds to thousands of spores, each capable of forming a new organism. Regeneration (one individual from a fragment), grafting (one plant from two parts), and budding (one bud at a time) produce far fewer individuals at once.
Q24. Hormones are added in tissue culture to promote:
DifferentiationIn plant tissue culture, specific ratios of plant growth regulators (auxins, cytokinins) are added to the nutrient medium. Auxins promote root differentiation; cytokinins promote shoot differentiation. By manipulating hormone balance, the undifferentiated callus is induced to differentiate into roots, shoots, and complete plantlets. Respiration, digestion, and excretion are not directly promoted by hormones in this context.
Q25. All the reproductive methods discussed so far involve:
Single parentVegetative propagation, budding, regeneration, spore formation, and fragmentation are all forms of asexual reproduction. They involve only one parent (no gamete formation or fusion) and produce offspring that are genetically identical to the parent. Fertilisation, gamete fusion, and two parents are features of sexual reproduction.
Q26. Spores are protected by:
Thick wallsFungal spores (e.g., Rhizopus) and bacterial endospores are surrounded by thick, resistant cell walls often containing chitin, sporopollenin, or other tough materials. These thick walls provide protection against desiccation, heat, UV radiation, and chemicals, allowing spores to survive harsh conditions until favourable conditions for germination arise.
Q27. Spore formation helps organisms to:
Survive unfavourable conditionsSpores are highly resistant structures that allow organisms (especially fungi and bacteria) to survive extreme conditions—drought, heat, cold, lack of nutrients, or toxic environments. When conditions improve, spores germinate and resume growth. This is a survival strategy, not a means to stop growth permanently or reproduce slowly.
Q28. Vegetative propagation occurs mainly in:
PlantsVegetative propagation is a natural and artificial method of asexual reproduction primarily found in plants. Examples include runners (strawberry), tubers (potato), rhizomes (ginger), bulbs (onion), and leaf buds (Bryophyllum). While some simple animals can regenerate or bud, the term “vegetative propagation” is specifically used for plants.
Q29. Regeneration is not considered true reproduction because:
Organisms are not normally cut into piecesIn nature, regeneration primarily functions as a repair mechanism (regrowing lost tails, limbs, etc.) rather than a routine method of producing new individuals. While some organisms (like planaria) can regenerate whole bodies from fragments, this is not their primary or usual mode of reproduction. True reproduction normally occurs without deliberate fragmentation of the parent body.
Q30. Spores germinate when they land on a:
Moist surfaceSpores require moisture for germination. Water activates enzymes, allows metabolic processes to resume, and enables the spore wall to rupture, allowing the emerging hypha (in fungi) or germ tube to absorb nutrients. Hot, dry, or salty surfaces are typically inhospitable and may prevent germination or kill the spore.
Q31. Which organisms can regenerate from body pieces?
Hydra and PlanariaHydra and Planaria (flatworms) are well-known for their remarkable regenerative abilities. A small body fragment (even 1/200th of a planaria) can regenerate into a complete organism. Frogs, fish, humans, and dogs have limited regeneration (e.g., wound healing, liver regrowth) but cannot regenerate entire bodies from random pieces. Amoeba and Paramecium reproduce by fission, not regeneration from pieces.
Q32. Regeneration mainly occurs in organisms with:
Simple body organisationRegeneration of entire organisms from body fragments is possible only in organisms with relatively simple body organization (e.g., Hydra, planaria, sponges). These organisms have fewer specialized tissues and retain populations of pluripotent or totipotent stem cells. Highly complex organisms (vertebrates) cannot regenerate entire bodies from fragments due to complex tissue organization and loss of stem cell potency.
Q33. A mature bud in Hydra:
Detaches and becomes independentIn Hydra, a bud grows, develops tentacles and a mouth, and forms a miniature hydra. When fully mature, the bud detaches from the parent body and lives as an independent individual. This allows the parent to produce multiple offspring over time without sacrificing itself. Permanent attachment, death, or spore formation does not occur in Hydra budding.
Q34. Asexual reproduction generally leads to:
Rapid population increaseAsexual reproduction allows a single parent to produce many offspring in a short time without the need to find a mate. This leads to rapid population growth under favourable conditions. However, it results in low genetic variation, not high variation. Survival depends on environmental stability; reduced survival occurs if conditions change unfavourably.
Q35. Asexual reproduction generally produces offspring that are:
Genetically identicalAsexual reproduction involves mitotic cell division (or equivalent processes) without gamete fusion. The offspring inherit an exact copy of the parent’s DNA, making them genetically identical (clones) to the parent and to each other, barring rare mutations. Genetic different offspring arise from sexual reproduction.
Q36. Potato pieces without buds:
Do not form new plantsThe “eyes” (buds) on potato tubers contain meristematic tissue capable of sprouting into new shoots. A potato piece without any buds lacks these meristems and cannot produce new plants. Even if planted, it will rot or dry out without generating shoots, though it might produce some roots (roots alone cannot form a complete potato plant).
Q37. The reproductive structures in Rhizopus are:
SporangiaIn Rhizopus (bread mould), the reproductive structures are sporangia—spherical, black structures borne at the tips of upright hyphae (sporangiophores). Sporangia contain hundreds of haploid spores. When mature, sporangia burst, releasing spores. Hyphae are vegetative structures; Rhizopus has no true roots or leaves (it is a fungus).
Q38. The common feature of budding, regeneration, vegetative propagation and spore formation is:
Single parent reproductionAll four methods—budding (Hydra, yeast), regeneration (planaria, Hydra), vegetative propagation (plants), and spore formation (Rhizopus, ferns)—are forms of asexual reproduction. They require only one parent, produce offspring without gamete formation or fusion, and do not involve fertilisation or two parents.
Q39. Regeneration is the process by which:
Body parts grow into complete organismsRegeneration is the ability to regrow lost body parts or, in some organisms, to develop an entire new individual from a small body fragment. For example, a fragment of a planaria can regenerate into a complete worm. This differs from spore production, seed germination, or gamete formation, which are separate reproductive processes.
Q40. Reproduction involving a single parent is called:
Asexual reproductionAsexual reproduction is defined as reproduction that involves only one parent. Offspring are produced without the formation or fusion of gametes. Methods include fission, budding, fragmentation, spore formation, and vegetative propagation. Sexual reproduction involves two parents. “Regenerative growth” and “cross reproduction” are not standard terms for single-parent reproduction.
Q41. Complex organisms cannot reproduce by regeneration because:
Body organisation is complexComplex multicellular organisms (e.g., humans, dogs, birds) have highly specialized tissues, organs, and organ systems arranged in a precise body plan. A random body fragment lacks the organizational instructions and stem cell populations needed to regenerate a complete, functional body. Regeneration is limited to wound healing or regrowth of simple structures (e.g., liver, skin), not entire organisms.
Q42. In regeneration, specialised cells first:
ProliferateThe first step in regeneration is proliferation (rapid cell division) of specialized or stem cells at the wound or cut site. This increases the cell population to form a blastema (a mass of undifferentiated cells). Only after sufficient proliferation do cells begin to differentiate into specific tissues and organs. Cells do not die, stop dividing, or directly become organs as the first step.
Q43. In budding, a new individual forms as an:
OutgrowthIn budding, a small external outgrowth (bud) develops on the parent body. This outgrowth grows, develops features of the adult (e.g., tentacles in Hydra), and eventually detaches as a new independent individual. It is not a fragment (which results from breaking), not a spore (single-celled reproductive unit), and not an internal cavity.
Q44. A major benefit of spore formation is:
Protection from harsh conditionsSpores are encased in thick, resistant walls that protect the genetic material from extreme heat, cold, desiccation, UV radiation, and chemicals. This allows the organism to survive unfavourable conditions (e.g., winter, drought) and resume growth when conditions improve. Dependence on water, lack of variation, and slowness are disadvantages, not benefits.
Q45. Vegetative propagation is commonly used for crops like:
Sugarcane and grapesSugarcane is propagated by stem cuttings (setts), and grapes (Vitis) are propagated by stem cuttings, layering, or grafting. These crops do not produce true-to-type seeds or have long juvenile periods. Maize, barley, wheat, rice, and pulses (beans, lentils) are typically grown from seeds (sexual reproduction), not vegetative propagation.
Q46. Tissue culture is also known as:
MicropropagationTissue culture, in the context of plant propagation, is also called micropropagation because it involves growing plants from small tissue pieces (explants) under sterile, controlled conditions on a small scale (micro). Pollination involves pollen transfer; fragmentation is natural breaking; layering is a traditional vegetative method. Micropropagation is the modern, laboratory-based term.
Q47. Bryophyllum reproduces vegetatively through:
Leaf budsBryophyllum (Kalanchoe) produces small adventitious buds along the margins (edges) of its leaves. These leaf buds (epiphyllous buds) fall off, root in the soil, and grow into new plants. This is a classic textbook example of vegetative propagation through leaves. Flowers, stem cuttings, and roots are not the primary means for Bryophyllum.
Q48. Sporangia contain:
SporesSporangia (singular: sporangium) are reproductive structures found in fungi (e.g., Rhizopus) and plants (e.g., ferns). They contain spores—microscopic, haploid reproductive cells that can germinate into new individuals under suitable conditions. Seeds (angiosperms), buds (Hydra), and gametes (sex cells) are not contained within sporangia.
Q49. Vegetative propagation is useful in agriculture because it:
Preserves desired traitsVegetative propagation produces genetically identical offspring (clones). This is highly valuable in agriculture because desirable traits—such as high yield, large fruit size, disease resistance, specific flower color, or uniform ripening—are preserved unchanged across generations. Sexual reproduction would mix traits and may not preserve the desired combination. Delayed fruiting and prevented growth would be disadvantages.
Q50. Tissue culture is commonly used for:
Ornamental plantsTissue culture (micropropagation) is most commonly used commercially for high-value ornamental plants, orchids, anthuriums, chrysanthemums, and foliage plants. It allows rapid multiplication of rare, beautiful, or disease-free specimens. While used for some food crops and trees, food grains (wheat, rice) are economically grown from seeds, and forest trees are often grown from seeds or cuttings due to cost constraints. Ornamental plants are the most prominent application.