Biology Test Questions And Answers

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Biology Test Questions And Answers

Do you know what is photosynthesis in plants? What are dark reactions and what are light reactions? Check out our online quiz to test yourself, prepare for an upcoming biology exam, or learn interesting facts.


Questions and Answers
  • 1. 
    The process of Photosynthesis is......
    • A. 

      Reductive, accompanied by the release of energy and catabolic

    • B. 

      Reductive, requiring the absorption of energy and catabolic

    • C. 

      Reductive, requiring the absorption of energy and anabolic

    • D. 

      Reductive, accompanied by the release of energy and anabolic

  • 2. 
    Light is necessary in the process of photosynthesis to……
    • A. 

      Split carbon dioxide

    • B. 

      Produce ATP and a reducing substance

    • C. 

      Fix carbon dioxide

    • D. 

      Combine carbon dioxide and water

  • 3. 
    In photosynthesis, dark reaction is called so because …..
    • A. 

      It occurs in dark.

    • B. 

      It does not require light energy.

    • C. 

      It cannot occur during daytime.

    • D. 

      It occurs more rapidly at night.

  • 4. 
    Rate of photosynthesis does not depend upon …….
    • A. 

      Quality of light

    • B. 

      Intensity of Light

    • C. 

      Duration of Light

    • D. 

      Temperature

  • 5. 
    The importance of hot alcohol in Melvin Calvin's experiment is for .....
    • A. 

      Killing the Algae and stopping biochemical reactions

    • B. 

      Fixing CO2 gas to a solid sugar

    • C. 

      Facilitating the action of enzymes

    • D. 

      Having an enough time for building up hexose molecules

  • 6. 
    First stable product of Calvin cycle has ….
    • A. 

      2 carbon atoms

    • B. 

      3 carbon atoms

    • C. 

      4 carbon atoms

    • D. 

      6 carbon atoms

  • 7. 
    Which one of the following is a product of dark reaction of photosynthesis?
    • A. 

      CO2

    • B. 

      ATP

    • C. 

      NADPH

    • D. 

      Phosphoglyceraldhyde

  • 8. 
    During dark reaction of photosynthesis ……
    • A. 

      Water splits

    • B. 

      CO2 is reduced to organic compounds

    • C. 

      Chlorophyll is activated

    • D. 

      6 carbon sugar is broken down into 3 carbon sugar

  • 9. 
    How many molecules of CO2 are needed to be fixed for building up 4 molecules of hexose in dark reactions of photosynthesis?
    • A. 

      6

    • B. 

      24

    • C. 

      12

    • D. 

      4

  • 10. 
    Which of these features is not of chlorophyll?
    • A. 

      It has Mg+2 as the central metal ion.

    • B. 

      It has 55 atoms of carbon.

    • C. 

      It is found in the stroma of chloroplast.

    • D. 

      Its molecules are activated by light.

  • 11. 
    During light reaction in photosynthesis the following are formed ……
    • A. 

      ATP and sugar

    • B. 

      Hydrogen, O2 and sugar

    • C. 

      ATP, hydrogen donor and O2

    • D. 

      ATP, hydrogen and O2 donor

  • 12. 
    Which light range is most effective in photosynthesis?
    • A. 

      Red

    • B. 

      Yellow

    • C. 

      Green

    • D. 

      Violet

  • 13. 
    Which of the following describes the spongy tissue?
    • A. 

      They are arranged perpendicular to the leaf surface

    • B. 

      Consists of one raw of cells

    • C. 

      Are elongated parenchymatous cells

    • D. 

      In between the cells there are wide intercellular spaces.

  • 14. 
    By examining a T.S of the vascular bundle of a dicot. Plant leaf, we can see that ……
    • A. 

      The xylem tissue lies toward the lower epidermis while the phloem towards the upper epidermis.

    • B. 

      The phloem tissue translocates disolved organic food substances to the mesophyll

    • C. 

      The xylem vessels are separated by thick-walled cells called xylem parenchyma

    • D. 

      The midrib contains the main vascular bundle of the leaf.

  • 15. 
    Which is not true for the rate of photosynthesis reaction?
    • A. 

      Light intensity increases the rate of the light dependent reaction.

    • B. 

      Increase in temperature till a certain limit, increases the rate of dark reactions.

    • C. 

      Increase in Carbon dioxide concentration, increases the rate of light independent reactions.

    • D. 

      Chloride ions increase the rate of Calvin cycle.

  • 16. 
    The first scientist to demonstrate that photosynthesis is a light dependent reaction in which hydrogen from an oxidisable compound reduces carbon dioxide to cellular material was(were), ……
    • A. 

      Van Niel

    • B. 

      Blackman

    • C. 

      Melvin Calvin

    • D. 

      Scientists at California University

  • 17. 
    Dark reactions of photosynthesis are actually not totally independent of light as …..
    • A. 

      Its initial reactions occur in the presence of light.

    • B. 

      The reactions will be inhibited by the presence of light.

    • C. 

      They can occur during the day as well.

    • D. 

      They utilize the products of the light reactions.

  • 18. 
    In the diagram below, what are A, B, C and D?
    • A. 

      (D) ATP / (C ) NADH2 / (A) ADP / (B) AMP

    • B. 

      (C ) hexose / (B) CO2 / (A) NADP / (B) ATP

    • C. 

      (B) NADPH2 / (A) ADP / (D) NADP / (C ) ATP

    • D. 

      (A) ADP / (D) NAD / (C ) ATP / (B) NADH2

  • 19. 
    In the dark reactions NADPH2 is used to ……
    • A. 

      Fix O2

    • B. 

      Synthesize ADP

    • C. 

      Fix CO2

    • D. 

      Carry energy

  • 20. 
    …….. was used to reveal dark reactions of photosynthesis.
    • A. 

      8C

    • B. 

      11C

    • C. 

      12C

    • D. 

      14C

  • 21. 
    In the graph below, at low light intensity, photosynthesis occurs slowly because …...
    • A. 

      Only a small quantity of ATP and NADPH2 is created.

    • B. 

      Competition between oxygen and carbon dioxide for the active site on the enzyme carboxylase.

    • C. 

      Competion between some limiting factors other than light.

    • D. 

      Water is not sufficient for providing H+ ions that convert NADP to NADPH2.

  • 22. 
    What happens if NADP molecules are not reduced to NADPH2 in the light reactions of photosynthesis?
    • A. 

      No ATP production will take place.

    • B. 

      The rate of splitting of water to release oxygen will decrease.

    • C. 

      Chlorophyll molecules will not be activated.

    • D. 

      Phosphoglyceraldehyde will not be formed.

  • 23. 
    Sulphur Bacteria belong to the ……… organisms.
    • A. 

      Saprophytic

    • B. 

      Parasitic

    • C. 

      Phototrophic

    • D. 

      Holozoic

  • 24. 
    In the figure below, if part X is the grana of the chloroplast and part Y is its stroma. What are (A), (B) and (C )?
    • A. 

      (A) water / (B) hydrogen / (C) glucose

    • B. 

      (A) water / (B) ADP / (C) ATP

    • C. 

      (A) ADP / (B) enzymes / (C) NADP

    • D. 

      (A) Hydrogen / (B) NADP / (C) glucose

  • 25. 
    Green plants can’t survive in the deep oceans because …..
    • A. 

      There is no soil for fixing roots

    • B. 

      The oxygen concentration is very high

    • C. 

      The light intensity is very low

    • D. 

      The carbon dioxide concentration is very low

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