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 13 of 14
- A. Magnesium
- B. Iron
- C. Phosphorus
- D. Potassium
Explanation: The correct answer is Magnesium. Magnesium is a critical component of chlorophyll, and its deficiency leads to chlorosis-a condition where…
Correct answer: Magnesium- A. Halophytes
- B. Mesophytes
- C. Sciophytes
- D. Xerophytes
Explanation: Sciophytes are plants that grow in moderate to low intensity of light under the cover of large trees.
Correct answer: Sciophytes- A. P 600
- B. P 680
- C. P 700
- D. P 760
Explanation: Photosystem I has chlorophyll a molecule which absorbs maximum light of 700 nm and is called P700, whereas reaction center of photosystem…
Correct answer: P 700- A. Red-Yellow-Green
- B. Red-Orange-Blue
- C. Orange-Blue-Green
- D. Red-Orange-Yellow
Explanation: Accessory Pigments are the source of much of the RED-ORANGE-YELLOW coloration that we see in plant leaves.
Correct answer: Red-Orange-Yellow- A. Grana
- B. Stroma
- C. Thylakoids
- D. Intergrana
Explanation: In chloroplasts, chemiosmosis occurs in the thylakoids.
Correct answer: Thylakoids- A. Sodium Ions
- B. Magnesium ions
- C. Potassium ions
- D. Calcium ions
Explanation: Influx of potassium ions decreases water potential in the guard cell so water enters the cell from surrounding cells.
Correct answer: Potassium ions- A. RuBP + ATP
- B. RuBP + PGAL
- C. NADPH + ATP
- D. PGAL + ATP
Explanation: The two products of light dependent reaction of photosystem are ATP and NADPH.The light reaction is the first stage of the photosynthesis…
Correct answer: NADPH + ATP- A. Phytochrome
- B. Phytokinin
- C. Phytocyanin
- D. Carotenoids
Explanation: Some carotenoids protect chlorophyll from intense light by absorbing and dissipating excessive light energy, rather than transferring…
Correct answer: Carotenoids- A. Yellow, Red, Green, Blue
- B. Orange, Yellow, Red, Brown
- C. Green, Yellow, Blue, Brown
- D. Blue, Red, Green, Yellow
Explanation: Photosynthetic organisms contain light-absorbing molecules called pigments that absorb only specific wavelengths of visible light while…
Correct answer: Orange, Yellow, Red, Brown- A. PC
- B. PQ
- C. Cytochrome-b
- D. Pentamerous
Explanation: Plastoquinone (PQ) is the correct answer as it accepts excited electrons from photosystem-II and transfers them down the electron…
Correct answer: PQ- A. Cristae to stroma
- B. Stroma to grana
- C. Grana to cristae
- D. Grana to stroma
Explanation: Photosynthesis occurs in 2 steps:1. Light-dependent reactions2. Light-independent reactionsLight-dependent reactions occur on the…
Correct answer: Grana to stroma- A. 4-ATP
- B. 36-ATP
- C. 32-ATP
- D. NO-ATP
Explanation: Photorespiration (also known as the C2 cycle) is a metabolic process in plants where the enzyme rubisco combines O2 with RuBP in the…
Correct answer: NO-ATP- A. PGA
- B. PGAL
- C. RUBP
- D. RUBISCO
Explanation: In the third and final stage of the Calvin cycle i.e. regeneration of RuBP, 1 glyceraldehyde 3-phosphate molecule is used to create…
Correct answer: RUBP- A. Thin & elastic
- B. Thick & elastic
- C. Thin & non elastic
- D. Thick & non elastic
Explanation: Guard cells are pairs of specialized epidermal cells that work to control excessive water loss, closing on hot, dry, or windy days and…
Correct answer: Thin & elastic- A. Phosphorus
- B. Zinc
- C. Iron
- D. Iodine
Explanation: Calcium, sodium, magnesium, phosphorus and potassium are sometimes included as macronutrients because they are required in relatively…
Correct answer: Phosphorus- A. Iron
- B. Copper
- C. Zinc
- D. Magnesium
Explanation: Magnesium (Mg2+) is an essential macronutrient of living cells and is the second most prevalent free divalent cation in plants.
Correct answer: Magnesium- A. Macronutrients
- B. Micronutrients
- C. Trace elements
- D. Minor elements
Explanation: Hydrogen, magnesium, nitrogen, and phosphorus all are macronutrients. Macronutrients are the nutrients we need in larger quantities that…
Correct answer: Macronutrients- A. Kidney shape
- B. Oval
- C. Rounded
- D. Dumbbell shaped
Explanation: The correct answer is dumbbell-shaped. Monocots have stomatal guard cells that are dumbbell-shaped, allowing for better regulation of gas…
Correct answer: Dumbbell shaped- A. Glycolate --> Glycine, Glycine --> Serine + CO2, RuBP + O2 --> Glycolate
- B. RuBP + O2 --> Glycolate, Glycine --> Serine + CO2, Glycolate --> Glycine
- C. RuBP + O2 --> Glycolate, Glycolate --> Glycine, Glycine --> Serine + CO2
- D. Glycine --> Serine + CO2, RuBP + O2 --> Glycolate, Glycolate --> Glycine
Explanation: Photorespiration is a process in plants where RuBP (Ribulose Bisphosphate) reacts with oxygen, rather than carbon dioxide, leading to a…
Correct answer: RuBP + O2 --> Glycolate, Glycolate --> Glycine, Glycine --> Serine + CO2- A. Blue, green, brown, or red
- B. Orange, yellow, blue, or brown
- C. Yellow, orange, red, or brown
- D. Blue, red, orange, or brown
Explanation: Carotenoids are accessory pigments found in plants that include colors such as yellow, orange, red, and brown.
Correct answer: Yellow, orange, red, or brown