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 12 of 14
- A. C55H70O6N4Mg
- B. C70H55O11N5Mg4
- C. C14H55O6N5Mg3
- D. C55H76O5N6Mg2
Explanation: The correct molecular formula of chlorophyll b is C55H70O6N4Mg. This formula indicates the presence of 55 carbon atoms, 70 hydrogen atoms…
Correct answer: C55H70O6N4Mg222. The complex force of photosynthesis can be studied by the use of one of the following isotopes :
- A. 6C14
- B. 1H2
- C. 2He4
- D. 6O16
Explanation: Oxygen-16 is the ideal isotope for studying photosynthesis because it allows for precise measurements of oxygen uptake and flow during the…
Correct answer: 6O16- A. Iron
- B. Sodium
- C. Potassium
- D. Magnesium
Explanation: The porphyrin ring of chlorophyll contains a magnesium atom at its center.
Correct answer: Magnesium- A. Tracheids
- B. Trachea
- C. Collenchyma
- D. Sieve tubes
Explanation: Phloem tissues are composed of sieve tubes, which are specialized cells responsible for transporting organic materials, such as sugars…
Correct answer: Sieve tubes- A. Nitrogen
- B. Oxygen
- C. Carbon monoxide
- D. Carbon dioxide
Explanation: Chloroplasts are the site of photosynthesis in plant cells, where carbon dioxide (CO2) is fixed into organic molecules.
Correct answer: Carbon dioxide- A. Thylakoid
- B. Grana
- C. Stroma
- D. Christa
Explanation: Plant cells synthesize sugar in the stroma of chloroplasts. The stroma contains the enzymes necessary for the Calvin cycle, which is the…
Correct answer: Stroma- A. plant hormones
- B. carotenoids
- C. plant enzymes
- D. water present in mysophyll tissue
Explanation: Carotenoids are the photoprotective pigments that absorb light of high intensity and transfer the energy to chlorophyll for…
Correct answer: carotenoids- A. nitrogen
- B. magnesium
- C. potassium
- D. both a and b
Explanation: Chlorosis is the yellowing of leaves due to a lack of chlorophyll, often caused by nutrient deficiencies.
Correct answer: both a and b- A. phosphorus
- B. potassium
- C. magnesium
- D. nitrogen
Explanation: The correct answer is phosphorus. Phosphorus is essential for the development of roots, flowers, seeds, and fruit.
Correct answer: phosphorus230. Hydathodes are
- A. hormones secreting glands
- B. water secreting glands
- C. nectar secreting glands
- D. enzymes secreting glands
Explanation: Hydathodes are holes in leaf magrin through which water is secreted out during guttation.
Correct answer: water secreting glands- A. hydroxyl group
- B. methyl group
- C. carboxyl group
- D. aldehyde group
Explanation: Chlorophyll 'a' is an essential pigment in photosynthesis, and its structure includes a porphyrin ring.
Correct answer: methyl group- A. Hydrophytes
- B. Xerophytes
- C. Mesophytes
- D. All of the above
Explanation: Sunken stomata are a characteristic adaptation found in xerophytes, which are plants adapted to dry, arid environments.
Correct answer: Xerophytes- A. Violet blue light
- B. Orange light
- C. Blue-red light
- D. Red, orange light
Explanation: Chlorophyll a and b primarily absorb blue and red light. Blue light, being high in energy, excites electrons to a higher energy level…
Correct answer: Blue-red light- A. Vessels, tracheids, parenchyma
- B. Sieve tubes, companion cells, fibers
- C. Parenchyma, sieve tube, vessels
- D. Fibers, companion cells, tracheids
Explanation: Xylem tissue is primarily responsible for water transport in plants and consists of four main components: tracheids, vessels, parenchyma…
Correct answer: Vessels, tracheids, parenchyma235. Carotenoid contains:
- A. Carotenes
- B. Xanthophylls
- C. Chlorophyll - C
- D. Both (A) and (B)
Explanation: The carotenoids are divided into two main classes: carotenes and xanthophylls.
Correct answer: Both (A) and (B)- A. Adhesion
- B. Cohesion
- C. Collision
- D. Corrosion
Explanation: The correct answer is Adhesion. Adhesion describes the attraction between unlike molecules.
Correct answer: Adhesion- A. Water potential
- B. Pressure potential
- C. Solute potential
- D. Osmotic potential
Explanation: The correct answer is Solute potential. The concentration of water molecules is inversely proportional to solute potential because when…
Correct answer: Solute potential- A. Grasses
- B. Under ground stems
- C. Fruit-nuts
- D. Cabbage leaves
Explanation: Bulliform cells or motor cells are large, bubble-shaped epidermal cells that occur in grps on the upper surface of the leaves of many…
Correct answer: Grasses- A. N2
- B. O2
- C. CO2
- D. NH3
Explanation: The stroma of chloroplasts is where the Calvin cycle occurs, which is responsible for fixing carbon dioxide (CO2) into organic molecules…
Correct answer: CO2- A. Methyl group
- B. Carboxyl group
- C. Aldehyde group
- D. Hydroxyl group
Explanation: The porphyrin ring in chlorophyll-b is specifically attached to an aldehyde group, which includes a carbonyl group (C=O) bonded to a…
Correct answer: Aldehyde group