Free Forms and Functions of Plants MCQs with Answers
272 Forms and Functions of Plants MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Plant nutrition and transport cover mineral uptake, photosynthesis, xylem movement of water and minerals, and phloem translocation of sugars. Plant growth regulators include auxins, gibberellins, cytokinins, abscisic acid and ethene, whose effects on cell division, elongation, dormancy, fruit ripening and tropic responses should not be confused with mineral nutrition.
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Read the Forms and Functions of Plants notesFree MDCAT chapter notes with key terms272 questions · page 1 of 14
1. In plants the _ waste product is used in the chemical processes, they are not removed from the body.
- A. Ions
- B. Water
- C. Oxygen
- D. Nitrogenous
Explanation: Oxygen, a byproduct of photosynthesis, is either used by the plant in respiration or released into the atmosphere.
Correct answer: Oxygen- A. In short-day plants under long-day conditions
- B. In day-neutral plants under dark conditions
- C. In some gymnospermic plants only
- D. In long-day plants under short-day conditions
Explanation: GA can replace the long-day requirement, inducing flowering in long-day plants under short days.
Correct answer: In long-day plants under short-day conditions- A. planes of cell division
- B. Regions of meristematic activity
- C. Rate of cell growth
- D. Root of shoot tip growth
Explanation: The tunica and corpus are distinguished by the direction of cell divisions.
Correct answer: planes of cell division- A. Formation of callus
- B. Production of plasmodesmata
- C. Differentiation of new vascular tissues
- D. Regeneration of cortex and epidermis
Explanation: Callus forms first, later differentiates into vascular connections.
Correct answer: Formation of callus- A. ABA
- B. Gibberellin
- C. Ethylene
- D. Cytokinin
Explanation: GA stimulates amylase → starch → sugars for seedling energy.
Correct answer: Gibberellin- A. Tobacco
- B. Potato
- C. Tomato
- D. Cotton
Explanation: Garner & Allard (1920s) studied flowering response to day length.
Correct answer: Tobacco- A. Thigmotaxis
- B. Thigmonasty
- C. Thigmotropism
- D. Thermotaxis
Explanation: Directional growth in response to touch.
Correct answer: Thigmotropism- A. Abscisic acid
- B. Auxin
- C. Gibberellin
- D. Ethylene
Explanation: Auxin induces adventitious root formation.
Correct answer: Auxin- A. Annual plants
- B. Floral parts
- C. Vessel and tracheid elements
- D. Leaf abscission
Explanation: Xylem elements undergo programmed cell death during differentiation.
Correct answer: Vessel and tracheid elements- A. Autonomic movement of variation
- B. Paratonic movement of growth
- C. Autonomic movement of growth
- D. Autonomic movement of locomotion
Explanation: Occurs due to internal growth processes.
Correct answer: Autonomic movement of growth- A. Invertase
- B. Amylase
- C. Lipase
- D. Protease
Explanation: Amylase breaks starch → maltose/glucose → energy for germination.
Correct answer: Amylase- A. Releases wound hormones
- B. Induces differentiation of new shoots
- C. Frees axillary buds from apical dominance
- D. Apical shoot grows faster
Explanation: Removes apical bud → axillary buds grow → hedge dense.
Correct answer: Frees axillary buds from apical dominance- A. Specialized muscle-like cells
- B. Chemical stimulation by prey
- C. Passive process
- D. Rapid turgor pressure changes
Explanation: Sudden turgor loss in specialized cells closes trap rapidly.
Correct answer: Rapid turgor pressure changes- A. High Auxin:Cytokinin Ratio
- B. High Cytokinin:Auxin Ratio
- C. High Gibberellin:Auxin Ratio
- D. High Gibberellin:Cytokinin Ratio
Explanation: High cytokinin-to-auxin ratio → shoot formation; high auxin → root formation.
Correct answer: High Cytokinin:Auxin Ratio- A. Ethylene
- B. Abscisic Acid
- C. IAA
- D. Starch
Explanation: .ABA induces dormancy and prevents premature germination.
Correct answer: Abscisic Acid- A. Cytokinin
- B. Gibberellic Acid
- C. Auxin
- D. Antigibberellin
Explanation: GA stimulates stem elongation, flowering, and fruit development.
Correct answer: Gibberellic Acid- A. Cell Division
- B. Leaf Fall and Dormancy
- C. Shoot Elongation
- D. Cell Elongation and Wall Formation
Explanation: ABA induces leaf abscission & seed dormancy under stress.
Correct answer: Leaf Fall and Dormancy- A. Gibberellins
- B. Enzymes
- C. Auxin
- D. Cytokinins
Explanation: Auxin distribution controls shoot bending toward light and root growth.
Correct answer: Auxin- A. Bending of shoot towards light
- B. Movement of root towards soil
- C. Nyctinastic leaf movements
- D. Movement of sunflower head tracking the sun
Explanation: Nyctinasty is turgor-based, circadian-regulated, not auxin controlled.
Correct answer: Nyctinastic leaf movements- A. Auxin
- B. Cytokinin
- C. Gibberellins
- D. Ethylene
Explanation: GA induces flowering without cold treatment.
Correct answer: GibberellinsForms and Functions of Plants MCQs: common questions
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