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 4 of 14
- A. Root apex
- B. Shoot apex
- C. Base of internodes
- D. Lateral sides of shoots
Explanation: Intercalary meristems are primarily found at the base of internodes in many plants and are responsible for the elongation of plant…
Correct answer: Base of internodes- A. Krebs cycle
- B. Calvin cycle
- C. Cyclic electron flow
- D. Non-cyclic electron flow
Explanation: The Calvin cycle is integral to the process of photosynthesis. It occurs in the stroma of chloroplasts and is sometimes referred to as the…
Correct answer: Calvin cycle- A. Nitrogen
- B. Potassium
- C. Phosphorus
- D. Magnesium
Explanation: Insectivorous plants grow in nitrogen-deficient soil, so they catch insects to obtain nitrogen.
Correct answer: Nitrogen- A. Have cells containing chloroplast
- B. Are located in the stem epidermis
- C. Are permanent pores that always remain open
- D. Are openings in the stem of shrubs that are regulated
Explanation: Unlike stomata, which open and close to regulate gas exchange, lenticels are permanent openings in the bark of woody plants.So option C is…
Correct answer: Are permanent pores that always remain open- A. Low, Low
- B. Low, High
- C. High, Low
- D. High, High
Explanation: Photorespiration is a process in plants where the enzyme RuBisCO oxygenates RuBP, leading to a decrease in photosynthetic output.
Correct answer: High, Low- A. I only
- B. I and II
- C. III only
- D. II and III
Explanation: The vacuolar pathway involves water moving from one cell's vacuole to the next, and it is a key pathway in transporting water to the xylem.
Correct answer: III only- A. Carbon dioxide, Potassium ions, decreases
- B. Glucose, Potassium ions decreases
- C. Carbon dioxide, Hydrogen ions increaes
- D. Glucose, Hydrogen ions increases
Explanation: As concentration of glucose and potassium ions increases, water potential decreases. This causes opening of stomata. So option B is correct.
Correct answer: Glucose, Potassium ions decreases- A. Graph A
- B. Graph B
- C. Graph C
- D. Graph D
Explanation: We know that as the wind speed increases, rate of transpiration increases.B option is the correct graphical representation of it.
Correct answer: Graph B- A. Dicot root
- B. Dicot stem
- C. Monocot root
- D. Monocot stem
Explanation: The given picture is microscopic view of dicot stem. It has epidermis, cortex, vascular bundles and pith.so option B is correct.
Correct answer: Dicot stem- A. Oxygen
- B. Rubisco
- C. Carbon dioxide
- D. Glyceraldehyde-3-phosphate
Explanation: In C3 plants, photosynthesis can be reduced by high levels of oxygen due to a process known as photorespiration.
Correct answer: Oxygen- A. Apoplast pathway
- B. Symplast pathway
- C. Vacuolar pathway
- D. Trans-membrane pathway
Explanation: The symplast pathway involves the movement of water through the cytoplasm of cells, connected by plasmodesmata which is shown in figure.
Correct answer: Symplast pathway- A. Carotene
- B. Xanthophyll
- C. Chlorophyll a
- D. Chlorophyll b
Explanation: In paper chromatography, pigments separate based on their differing solubilities in the chosen solvent and their affinity to the…
Correct answer: Chlorophyll b- A. ADP synthesis
- B. NAD formation
- C. Nitrogen fixation
- D. Carbon dioxide fixation
Explanation: During photorespiration, ribulose biphosphate carboxylase (RuBisCO) combines with oxygen instead of carbon dioxide, leading to a process…
Correct answer: Carbon dioxide fixation- A. ATP
- B. Water
- C. Oxygen
- D. NADPH
Explanation: The cyclic electron transport in the light-dependent reactions of photosynthesis specifically produces ATP.
Correct answer: ATP- A. Humidity: high, Temperature: low, Wind Speed: high
- B. Humidity: low, Temperature: high, Wind Speed: high
- C. Humidity: high, Temperature: low, Wind Speed: low
- D. Humidity: low, Temperature: high, Wind Speed: low
Explanation: The correct answer is Option C:Humidity: high, Temperature: low, Wind Speed: lowTranspiration is the process of water movement through a…
Correct answer: Humidity: high, Temperature: low, Wind Speed: low- A. Transpiration
- B. Translocation
- C. Excretion
- D. Egestion
Explanation: The correct answer is transpiration. Transpiration is the process by which water is absorbed by plant roots and then evaporated from the…
Correct answer: Transpiration- A. Photolysis
- B. Chemiosmosis
- C. Carbon fixation
- D. Cyclic phosphorylation
Explanation: In photosynthesis, oxygen is released during the photolysis of water, which occurs in the light-dependent reactions.
Correct answer: Photolysis- A. Condition I shows guard cells in a turgid state, leading to a closed stomatal pore
- B. Condition II represents flaccid guard cells, resulting in an open stomatal pore
- C. Condition I indicates turgid guard cells with an open stomatal pore, while Condition II shows flaccid guard cells with a closed stomatal pore
- D. Both conditions show guard cells in the same state, impacting stomatal opening similarly
Explanation: The correct answer is Option C.In Condition I, the guard cells are turgid, meaning they are swollen due to water intake, which causes the…
Correct answer: Condition I indicates turgid guard cells with an open stomatal pore, while Condition II shows flaccid guard cells with a closed stomatal pore- A. Reaction centre to gain the greatest possible amount of energy
- B. Light energy to be harvested in the molecule of electron acceptor
- C. Accessory pigment molecules to get closely associated with each other
- D. Chlorophyll-b molecule in the reaction centre to become highly energised
Explanation: The correct answer is Option A. Antennae pigment molecules in the photosystem are responsible for capturing light energy and funneling it…
Correct answer: Reaction centre to gain the greatest possible amount of energy- A. ATP molecules, the electrons are cycled back into the photosystem I
- B. ATP molecules, the electrons are cycled back into the photosystem II
- C. NADPH molecules, the electrons are cycled back into the photosystem I
- D. NADPH molecules, the electrons are cycled back into the photosystem II
Explanation: The correct understanding involves recognizing that in the cyclic flow of electrons during the light-dependent reactions of…
Correct answer: ATP molecules, the electrons are cycled back into the photosystem I