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11th Botany - Photosynthesis Book Back Questions Question Bank Software Sep-12 , 2019

Botany - Photosynthesis 

11th Botany - Photosynthesis Book Back Questions

Botany - Photosynthesis Book Back Questions

11th Standard

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Biology

Time : 00:30:00 Hrs
Total Marks : 15
    3 x 1 = 3

  1. Assertion (A): Increase in proton gradient inside lumen responsible for ATP synthesis
    Reason (R): Oxygen evolving complex of PS I located on thylakoid membrane facing Stroma, releases H+ ions

    (a)

    Both Assertion and Reason are True.

    (b)

    Assertion is True and Reason is False.

    (c)

    Reason is True and Assertion is False.

    (d)

    Both Assertion and Reason are False.

  2. The correct sequence of flow of electrons in the light reaction is _______.

    (a)

    PS II, plastoquinone, cytochrome, PS I, ferredoxin.

    (b)

    PS I, plastoquinone, cytochrome, PS II ferredoxin.

    (c)

    PS II, ferredoxin, plastoquinone, cytochrome, PS I.

    (d)

    PS II, plastoquinone, cytochrome, PS II, ferredoxin.

  3. Identify true statement regarding light reaction of photosynthesis.

    (a)

    Splitting of water molecule is associate with PS I.

    (b)

    PS I and PS II involved in the formation of NADPH + H+

    (c)

    The reaction center of PS I is Chlorophyll a with absorption peak at 680 nm.

    (d)

    The reaction center of PS II is Chlorophyll a with absorption peak at 700 nm.

    4. 2 x 2 = 4

  4. Two groups (A & B) of bean plants of similar size and same leaf area were placed in identical conditions. Group A was exposed to light of wavelength 400-450nm & Group B to light of wavelength of 500-550nm. Compare the photosynthetic rate of the 2 groups giving reasons.

  5. When there is plenty of light and higher concentration of O2, what kind of pathway does the plant undergo? Analyse the reasons.

    6. 1 x 3 = 3

  6. Grasses have an adaptive mechanism to compensate photorespiratory losses. Name and describe the mechanism.

    7. 1 x 5 = 5

  7. In Botany class, teacher explains, Synthesis of one glucose requires 30 ATPs in C4 plants and only 18 ATPs in C3 plants. The same teacher explains C4 plants are more advantageous than C3 plants. Can you identify the reason for this contradiction?

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