TestUstad

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.

Last updated

Plant Nutrition and TransportPlant Growth Regulators
Read the Forms and Functions of Plants notesFree MDCAT chapter notes with key terms

272 questions · page 7 of 14

121. The primary electron acceptor in cyclic photophosphorylation is:

  • A. Carbon dioxide
  • B. A protein that contains iron and sulphur
  • C. NADP
  • D. FAD

Explanation: c) NADP:NADP (nicotinamide adenine dinucleotide phosphate) is the correct answer.

Read the full explanation →
Correct answer: NADP

122. Which plant was called by Charles Darwin as 'the most wonderful plant in the world'?

  • A. Aldrovanda (water fly trap)
  • B. Utricularia (bladder wort)
  • C. Dionaea muscipula (venus fly trap)
  • D. Pitcher plant
  • E. Drosera intermedia (sundew)

Explanation: Explanation for this question will be added soon.

Read the full explanation →
Correct answer: Dionaea muscipula (venus fly trap)

123. Which of the following statements are correct about phloem translocation? I. It occurs from a source to a sink II. The source is where the photosynthetic products are synthesized III. The movement is driven by a pressure gradient produced due to differences in osmotic pressure between the source and the sink IV. Sieve plates maintain pressure gradient between the source and the sink by resisting flow along the sieve tubes

  • A. Only option I
  • B. Only option II
  • C. Both options I and II
  • D. Both options II and IV
  • E. All are correct

Explanation: Explanation for this question will be added soon.

Read the full explanation →
Correct answer: All are correct

124. The enzyme responsible for carboxylation in Calvin cycle is:

  • A. Rubisco
  • B. Rubiscase
  • C. Ribulin
  • D. Isomerase
  • E. None of these

Explanation: Explanation for this question will be added soon.

Read the full explanation →
Correct answer: Rubisco

125. This is not a class of chlorophyll:

  • A. Chlorophyll a
  • B. Chlorophyll b
  • C. Chlorophyll d
  • D. Chlorophyll g
  • E. Chlorophyll c

Explanation: Explanation for this question will be added soon.

Read the full explanation →
Correct answer: Chlorophyll g

126. The first action spectrum was obtained by?

  • A. Theodor Wilhelm Engelmann
  • B. Malleus
  • C. Ada Lovelace
  • D. Linus Pauling

Explanation: The first action spectrum was made by T. W. Engelmann, who split light into its components by the prism and then illuminated Cladophora…

Read the full explanation →
Correct answer: Theodor Wilhelm Engelmann

127. The pathways of water transport in which water moves through plasmodesmata is:

  • A. Apoplast
  • B. Symplast
  • C. Vacuolar
  • D. Ascent of sap

Explanation: In plant cells, water can move from one cell to another through plasmodesmata, which are microscopic channels that connect plant cells.

Read the full explanation →
Correct answer: Symplast

128. Estimating relative CO2 consumption or O2 release during photosynthesis at different wavelengths of light, is termed as:

  • A. Action spectrum
  • B. Absorption spectrum
  • C. Dark reaction
  • D. Light reaction

Explanation: Action spectra show the effectiveness of different colors of light for carrying out photosynthesis measured by CO2 consumption or O2…

Read the full explanation →
Correct answer: Action spectrum

129. Nitrogen-fixing bacteria in root nodules fix nitrogen in soil and air into:

  • A. Ammonia
  • B. Nitrite
  • C. Nitrate
  • D. Amino acid

Explanation: The symbiotic nitrogen-fixing bacteria invade the root hairs of host plants, where they convert free nitrogen to ammonia, which the host…

Read the full explanation →
Correct answer: Ammonia

130. Light independent reactions take place in:

  • A. Grana
  • B. Stroma
  • C. Thylakoid
  • D. Both Grana and Stroma

Explanation: The light dependent reaction takes place in the thylakoid membrane. The dark reaction(light-independent reaction) takes place in the stroma.

Read the full explanation →
Correct answer: Stroma

131. Chlorophyll pigments are present in:

  • A. Chloroplast
  • B. Chromoplast
  • C. Elioplast
  • D. Amyloplast

Explanation: Greenish pigment carrier for photosynthesis present in the chlorophyll in the cell.

Read the full explanation →
Correct answer: Chloroplast

132. Xanthophylls are which pigment?

  • A. Yellow
  • B. Red
  • C. Orange
  • D. Green

Explanation: Xanthophylls are accessory pigments in the thylakoid membrane of chloroplast in plant cells. They belong to the group carotenoids.

Read the full explanation →
Correct answer: Yellow

133. End product of light reaction of photosynthesis is:

  • A. ADP and NADPH
  • B. ATP and NADPH
  • C. Carbon dioxide and water
  • D. NADPH and AMP

Explanation: ATP and NADPH are synthesized in the light reactions of photosynthesis, which are then used in the Calvin cycle to produce sugars.

Read the full explanation →
Correct answer: ATP and NADPH

134. The number of ATP used to produce 1 glucose in Calvin cycle is:

  • A. 18
  • B. 27
  • C. 9
  • D. 36

Explanation: It would take six turns of the cycle, or 6 CO2 start text, 18 ATP, and 12 NADPH, to produce one molecule of glucose.

Read the full explanation →
Correct answer: 18

135. In the light reaction, water is used in:

  • A. Reduction
  • B. Oxidation
  • C. Photolysis
  • D. Oxygenation

Explanation: It provides protons and electrons for further process of photosynthesis.

Read the full explanation →
Correct answer: Photolysis

136. Light reaction takes place in which part of the chloroplast?

  • A. Thylakoid
  • B. Stroma
  • C. Lamella
  • D. Membrane

Explanation: The light reaction takes place in the thylakoid membranes. In the light reaction, the light is absorbed and energy is used to drive…

Read the full explanation →
Correct answer: Thylakoid

137. What are the products of light dependent reactions of photosynthesis?

  • A. ATP. RuBP and reduced NAD
  • B. ATP, oxygen and reduced NADP
  • C. GP, oxygen and reduced NAD
  • D. GP reduced NADP and RuBP

Explanation: The three products of the light reaction of photosynthesis are ATP, NADPH, and O2

Read the full explanation →
Correct answer: ATP, oxygen and reduced NADP

138. In the process of photosynthesis water act as:

  • A. Proton accepter
  • B. Electron donor
  • C. CO2 reducer
  • D. CO2 accepter

Explanation: Water also provides electrons that bind to the hydrogen atoms to the carbon to produce glucose.

Read the full explanation →
Correct answer: Electron donor

139. During photosynthesis, CO2 works as:

  • A. Proton donor
  • B. Eleclton donor
  • C. Proton acceptor
  • D. Source of O2

Explanation: During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil.

Read the full explanation →
Correct answer: Proton acceptor

140. End product of Calvin cycle Is:

  • A. 3-phosphoglycerate
  • B. 1,3- biphosphogylcerate
  • C. Glyceraldehyde -3-phosphate
  • D. Glucose

Explanation: In the second stage, ATP and NADPH are used to convert the 3-PGA molecules into molecules of a three-carbon sugar…

Read the full explanation →
Correct answer: Glyceraldehyde -3-phosphate
Start Free Forms and Functions of Plants Practice MCQs Test