Photosynthesis in Higher Plants

Class 11 · Biology · 17 Questions

In-text 1beginner💡 Understand2 marksShort Answer

Can you explain how this conclusion could be drawn?

In-text 2intermediate🔧 Apply2 marksEssay

Can you imagine how Priestley would have conducted the experiment using a candle and a plant? Remember, he would need to rekindle the candle to test whether it burns after a few days. How many different ways can you think of to light the candle without disturbing the set-up?

In-text 3intermediate🔍 Analyze2 marksShort Answer

6\text{CO}_2 + 12\text{H}_2\text{O} \xrightarrow{\text{Light}} \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{H}_2\text{O} + 6\text{O}_2

Can you explain why twelve molecules of water as substrate are used in the equation given above?

In-text 4beginner🧠 Remember1 markVery Short

Can you name some other parts where you think photosynthesis may occur?

In-text 5intermediate💡 Understand2 marksShort Answer

When do you think the chloroplasts will be aligned with their flat surfaces parallel to the walls? When would they be perpendicular to the incident light?

In-text 6beginner🧠 Remember1 markVery Short

Can you guess which is the most abundant plant pigment in the world?

In-text 9intermediate💡 Understand1 markVery Short

Then, where are the protons and O₂ formed likely to be released – in the lumen? or on the outer side of the membrane?

In-text 10intermediate⚖️ Evaluate2 marksEssay

Can we, hence, say that calling the biosynthetic phase as the dark reaction is a misnomer? Discuss this amongst yourselves.

In-text 11beginner🧠 Remember1 markVery Short

How many carbon atoms does it have?

In-text 12intermediate🔧 Apply2 marksNumerical

Work out how many ATP and NADPH molecules will be required to make one molecule of glucose through the Calvin pathway.

1intermediate🔧 Apply2 marksShort Answer

By looking at a plant externally, can you tell whether a plant is C₃ or C₄? Why and how?

2intermediate💡 Understand2 marksShort Answer

By looking at which internal structure of a plant you can tell whether a plant is C₃ or C₄? Explain.

3intermediate🔍 Analyze2 marksShort Answer

Even though a very few cells in a C₄ plant carry out the biosynthetic – Calvin pathway, yet they are highly productive. Can you discuss why?

4intermediate💡 Understand2 marksShort Answer

RuBisCO is an enzyme that acts both as a carboxylase and oxygenase. Why do you think RuBisCO carries out more carboxylation in C₄ plants?

5intermediate🔍 Analyze3 marksLong Answer

Suppose there were plants that had a high concentration of Chlorophyll b, but lacked chlorophyll a, would it carry out photosynthesis? Then why do plants have chlorophyll b and other accessory pigments?

6beginner💡 Understand2 marksShort Answer

Why is the colour of a leaf kept in the dark frequently becomes yellow, or pale green? Which pigment do you think is more stable?

7beginner🔧 Apply2 marksShort Answer

Look at leaves of the same plant on the shady side and compare it with the leaves on the sunny side. Or, compare the potted plants kept in the sunlight with those in the shade. Which of them has leaves that are darker green? Why?