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 6 of 14
- A. Due to the less negative water potential of the external environment than the cell
- B. Due to the more negative water potential of the external environment than the cell
- C. Due to the less positive water potential of the external environment than the cell
- D. Due to more positive water potential of the external environment than the cell
Explanation: When salt is applied to vegetables, it dissolves and creates a solution with a more negative water potential.
Correct answer: Due to the more negative water potential of the external environment than the cell- A. Ernst munch
- B. Robert Hooke
- C. Mohl
- D. Darwin
Explanation: The starch-sugar hypothesis is one hypothesis that explains the opening and closing of stomata. It was proposed by German botanist H. Mohl.
Correct answer: Mohl- A. Ernst Munch
- B. Charles Darwin
- C. Robert Brown
- D. Robert Hooke
Explanation: The pressure-flow hypothesis was formulated by Ernst Münch in 1930.The pressure flow hypothesis, also known as the mass flow hypothesis…
Correct answer: Ernst Munch- A. Companion cells
- B. Sieve tube members
- C. Vessels
- D. Parenchyma
Explanation: Phloem components are sieve tubes, companion cells, phloem fibres, and phloem parenchyma cells.The main components of the xylem are the…
Correct answer: Vessels- A. Plasmodcsmala
- B. Cortex
- C. Endodermis
- D. Pith
Explanation: In roots, the apoplast pathway of water is disrupted when water reaches the endodermis.
Correct answer: Endodermis- A. Hormonal signals affecting guard cells
- B. Change in turgor pressure of guard cells
- C. Role in gaseous exchange
- D. Impact of plant respiration
Explanation: The correct answer is that the opening and closing of stomata are driven by changes in the turgor pressure of guard cells (Option B).
Correct answer: Change in turgor pressure of guard cells- A. Opens partially
- B. Closes completely
- C. Opens completely
- D. Remains unchanged
Explanation: The correct answer is that the stomatal pore closes completely when sugar is converted into starch in guard cells.
Correct answer: Closes completely- A. Two meters
- B. Five meters
- C. One meter
- D. Half meter
Explanation: The correct answer is "One meter". A rye plant less than one meter tall can develop branch roots with a combined length of over 600…
Correct answer: One meter- A. 50% of vascular plants
- B. 70% of angiosperms
- C. 70% of gymnosperms
- D. 90% of angiosperms
Explanation: Answer is "90% of angiosperms"Explanation: Mycorrhizal fungi get sugar and shelter from the plant, and in exchange increase the plant's…
Correct answer: 90% of angiosperms- A. 200 meters
- B. 400 feet
- C. 300 meters
- D. 500 feet
Explanation: The correct answer is "200 meters." Xylem water tension, a result of transpiration and the cohesive and adhesive properties of water, can…
Correct answer: 200 meters- A. 100 times
- B. 200 times
- C. 300 times
- D. 150 times
Explanation: The correct answer is "200 times." During the process of imbibition, seeds absorb a significant amount of water, causing their volume to…
Correct answer: 200 times- A. Metabolism
- B. Respiration
- C. Photosynthesis
- D. Vernalization
Explanation: The correct answer is Photosynthesis. During photosynthesis, plants use about 1% of the absorbed water to convert carbon dioxide and light…
Correct answer: Photosynthesis- A. Cuticular transpiration
- B. Stomatal transpiration
- C. Lenticular transpiration
- D. None of these
Explanation: The correct answer is Lenticular transpiration. This type of transpiration occurs through lenticels, which are unique to woody plants and…
Correct answer: Lenticular transpiration- A. Gibberellins
- B. Ethylene
- C. Abscisic acid
- D. Cytokinins
Explanation: The correct answer is Abscisic acid. Abscisic acid (ABA) is a plant hormone that plays a critical role in regulating the closure of…
Correct answer: Abscisic acid- A. Increased
- B. Does not change
- C. Decreased
- D. First increased and then decreased
Explanation: The correct answer is "Decreased." When leaves transpire, they lose water vapor, which decreases the water potential of the mesophyll…
Correct answer: Decreased- A. 1 meter/8 years
- B. 1 meter/day
- C. 1 meter/hour
- D. 20 cm/min
Explanation: The correct answer is "1 meter/hour" because studies have shown that the average velocity of sugar transport in the phloem is…
Correct answer: 1 meter/hour- A. Capillarity
- B. Role of atmospheric pressure
- C. Pulsating action of living cells
- D. Transpiration cohesion theory of Dixon
Explanation: The transpiration cohesion theory states that water molecules in the xylem of a tree are held together by cohesion, or the attraction…
Correct answer: Transpiration cohesion theory of Dixon- A. Adhesion
- B. Cohesion
- C. Capillary action
- D. Transpiration
Explanation: This is the correct answer. Adhesion refers to the attraction between molecules of different substances.
Correct answer: Adhesion- A. Grana
- B. Stroma
- C. Thylakoid
- D. Both grana and stroma
Explanation: Dark reactions (light-independent reactions) of photosynthesis take place in the stroma of chloroplasts.
Correct answer: Stroma- A. Hydrophytes
- B. Mesophytes
- C. Xerophytes
- D. Succulant
Explanation: Brassica belongs to the cabbage family while rose belongs to the rose family.
Correct answer: Mesophytes