All Free Biology MCQs with Answers

• A. Hydrophytes
• B. Mesophytes
• C. Xerophytes
• D. Succulant

Explanation: Brassica belongs to the cabbage family while rose belongs to the rose family.

• 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.

• 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.

• 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.

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

Explanation: Explanation for this question will be added soon.

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

Explanation: Explanation for this question will be added soon.

• 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…

• 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.

• 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…

• 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…

• 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.

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

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

• 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.

• 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.

• 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.

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

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

• 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…

• 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

• 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.

• 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.