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 5 of 14
- A. Option A
- B. Option B
- C. Opion C
- D. Option D
Explanation: The C4 cycle, also known as the Hatch-Slack pathway, has two main steps: initial carbon fixation in mesophyll cells and the subsequent…
Correct answer: Option D- A. Leaves
- B. Buds
- C. Roots
- D. Branches
Explanation: The correct answer is Leaves. The Venus flytrap is known for its specialized leaves that act as traps.
Correct answer: Leaves- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: In general, water moves from an area of higher water potential to an area of lower water potential.
Correct answer: Option A- A. 3.0 kPa
- B. 4.3 kPa
- C. −3.0 kPa
- D. −4.3 kPa
Explanation: Water potential = solute potential + pressure potential-3.65+(-0.65)= pressure potentialPressure potential = -3.0kpaSo C is correct option.
Correct answer: −3.0 kPa- A. I only
- B. II only
- C. I and III
- D. II and III
Explanation: The correct answer is 'I only.' Aerenchyma is a type of tissue with large air spaces that facilitates gas exchange, particularly in…
Correct answer: I only- A. Sclereid
- B. Tracheid
- C. Parenchyma
- D. Collenchyma
Explanation: The correct answer is collenchyma. Collenchyma tissues are specialized for providing support to young, growing parts of the plant, such as…
Correct answer: Collenchyma- A. Pond
- B. River
- C. Desert
- D. Polar region
Explanation: The correct answer is Option D: polar region.The transverse section of the leaf likely shows adaptations like thick cuticles or reduced…
Correct answer: Polar region- A. Sunflower plant
- B. Water lily
- C. Cactus
- D. Pinus
Explanation: Aerenchyma is a specialized plant tissue characterized by large air spaces within its structure, primarily found in waterlogged plants e.g…
Correct answer: Water lily- A. Primary xylem and Primary phloem
- B. Primary xylem and Secondary xylem
- C. Primary xylem and secondary phloem
- D. Primary phloem and secondary phloem
Explanation: In a dicot stem, the vascular cambium is located between the primary xylem and primary phloem. So option A is correct.
Correct answer: Primary xylem and Primary phloem- A. 10 years
- B. 12 years
- C. 14 years
- D. 16 years
Explanation: The age of a tree can be determined by counting its annual rings, which are visible in the cross-sectional view of the woody stem.
Correct answer: 12 years- A. Stomata are closed during daytime
- B. Vascular tissues are well-developed
- C. Reproductive organs are multicellular
- D. Leaves have salt glands on the upper surface
Explanation: The correct answer is that xerophytes often close their stomata during the daytime to minimize water loss through transpiration, which is…
Correct answer: Stomata are closed during daytime- A. Lakes
- B. Ponds
- C. Oceans
- D. Deserts
Explanation: As an adaptation to the environment, plants in oceans have salt glands to excrete excess salt from their body. So option C is correct.
Correct answer: Oceans- A. Forms the bark
- B. Helps in translocation
- C. Involves in ascent of sap
- D. Is resistant to insect and fungal attacks
Explanation: Heartwood is the central, dark region in the cross section of a tree trunk.
Correct answer: Is resistant to insect and fungal attacks- A. ATP, NADH2, O2
- B. ATP, NADPH, O2
- C. ATP, NADPH, CO2
- D. PGA, NADH, O2
Explanation: The products of light-dependent reactions in photosynthesis are ATP and NADPH and Oxygen.
Correct answer: ATP, NADPH, O2- A. Apical meristem
- B. cork cambium
- C. Vascular cambium
- D. intercalary meristem
Explanation: Secondary xylem, also known as wood, is a tissue produced by the vascular cambium during secondary growth.
Correct answer: Vascular cambium- A. The defense system
- B. Multisensory hydraulic valve
- C. Hydrostatic pressure
- D. All of these
Explanation: Guard cells are specialized cells found in the epidermis of leaves that surround and regulate the opening and closing of stomata, which…
Correct answer: Multisensory hydraulic valve- A. Iron-cytochromes and chlorophyll
- B. Molybdenum cell permeability
- C. Cobalt- Required by nitrogen fixers
- D. Calcium- formation of cell wall.
Explanation: Molybdenum is an essential component in two enzymes that convert nitrate into nitrite (a toxic form of nitrogen) and then into ammonia…
Correct answer: Molybdenum cell permeability- A. Sodium
- B. Nitrogen
- C. Potassium
- D. Iron
Explanation: The correct answer is Potassium. Potassium is crucial for numerous plant processes, including water regulation and enzyme activation.
Correct answer: Potassium- A. Dionaea muscipula
- B. Drosera excelsa
- C. Drosera intermedia
- D. Nepenthes purpurea
Explanation: Dionaea muscipula, commonly known as the Venus flytrap, has highly specialised leaves that act as snap traps to capture and digest…
Correct answer: Dionaea muscipula- A. Gibberellins - Leaf fall
- B. Cytokinin - Cell division
- C. IAA - Cell wall elongation
- D. Abscisic acid - Stomatal closure
Explanation: Gibberellins promote growth, not leaf fall.
Correct answer: Gibberellins - Leaf fall