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Class 11 Photosynthesis in Higher Plants worksheet
CBSE Biology. Light reactions, Calvin cycle, C4 pathway, photorespiration, pigments. Every sheet has 20 questions in three sections and an answer key, and the numbers change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
The first stable product of the Calvin (C3) cycle is:
- glucose
- RuBP
- oxaloacetic acid
- 3-phosphoglyceric acid (PGA)
Answer
(d) 3-phosphoglyceric acid (PGA)
- 2.
How many molecules of NADPH does the Calvin cycle use to make 4 molecules of glucose?
- 48
- 72
- 24
- 12
Answer
(a) 48
6 CO₂ per glucose; 3 ATP and 2 NADPH per CO₂
- 3.
Where does the build-up of protons for ATP synthesis take place?
- The inner (lumen) side of the thylakoid membrane
- The stroma of mesophyll chloroplasts
- The bundle sheath cells
- The thylakoid lumen
Answer
(d) The thylakoid lumen
Section B · short answer
- 4.
What is the difference between cyclic and non-cyclic photophosphorylation?
Answer
Non-cyclic uses both photosystems; electrons from water pass to NADP⁺, so it makes ATP and NADPH and releases oxygen. Cyclic uses only PS I; electrons return to PS I, so it makes only ATP and no NADPH or oxygen.
- 5.
To make 1 molecule of glucose, how many CO₂ molecules must be fixed, how many turns of the Calvin cycle are needed, and how many ATP and NADPH are used?
Answer
6 CO₂; 6 turns; 18 ATP and 12 NADPH
one turn fixes one CO₂, using 3 ATP and 2 NADPH
Section C · long answer
- 6.
Describe the light reactions (the Z scheme).
Answer
Light absorbed by PS II excites the P680 electron, which passes along an electron transport chain (with cytochromes) to PS I; water is split to replace PS II electrons, releasing O₂. PS I (P700) is excited again and its electrons pass down a second chain to NADP⁺, reducing it to NADPH. The electron path looks like a Z. Protons pumped into the lumen drive ATP synthase.
Fresh sheets for your child
In the app, every Photosynthesis in Higher Plants sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
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