Chapter 13 – Photosynthesis In Higher Plants

Which metal ion is a constituent of chlorophyll?

• a.Iron
• b.Copper
• c.Magnesium
• d.Zinc

Which pigment acts directly to convert light energy to chemical energy?

• a.Chlorophyll a
• b.Chlorophyll b
• c.Xanthophyll
• d.Carotenoid

Which range of wavelength (in nm) is called photosynthetically active radiation (PAR)?

• a.100 - 390
• b.390 - 430
• c.400 - 700
• d.760 – 100,00

Which light range is least effective in photosynthesis?

• a.Blue
• b.Green
• c.Red
• d.Violet

Chemosynthetic bacteria obtain energy from

• a.Sun
• b.Infra red rays
• c.Organic substances
• d.Inorganic chemicals PHOTOSYNTHESIS IN HIGHER PLANTS 69

Energy required for ATP synthesis in PSII comes from

• a.Proton gradient
• b.Electron gradient
• c.Reduction of glucose
• d.Oxidation of glucose

During light reaction in photosynthesis the following are formed:

• a.ATP and sugar
• b.Hydrogen, O2 and sugar
• c.ATP, hydrogen and O2
• d.ATP, hydrogen and O2 donor

Dark reaction in photosynthesis is called so because

• a.It can occur in dark also
• b.It does not depend on light energy
• c.It cannot occur during day light
• d.It occurs more rapidly at night

PEP is primary CO2 acceptor in

• a.C4 plants
• b.C3 plants
• c.C2 plants
• d.Both C3 and C4 plants

Splitting of water is associated with

• a.Photosystem I
• b.Lumen of thylakoid
• c.Both Photosystem I and II
• d.Inner surface of thylakoid membrane

The correct sequence of flow of electrons in the light reaction is

• a.PSII, plastoquinone, cytochromes, PSI, ferredoxin
• b.PSI, plastoquinone, cytochromes, PSII, ferredoxin
• c.PSI, ferredoxin, PSII,
• d.PSI, plastoquinone, cytochromes, PSII, ferredoxin

The enzyme that is not found in a C3 plant is

• a.RuBP Carboxylase
• b.PEP Carboxylase
• c.NADP reductase
• d.ATP synthase

The reaction that is responsible for the primary fixation of CO2 is catalysed by

• a.RuBP carboxylase
• b.PEP carboxylase
• c.RuBP carboxylase and PEP carboxylase
• d.PGA synthase

When CO2 is added to PEP, the first stable product synthesised is:

• a.Pyruvate
• b.Glyceraldehyde-3-phosphate
• c.Phosphoglycerate
• d.Oxaloacetate

In a way green plants and cyanobacteria have synthesized all the food on the earth. Comment.

Tomatoes, carrots and chillies are red in colour due to the presence of one pigment. Name the pigment. Is it a photosynthetic pigment?

Why do we believe chloroplast and mitochondria to be semi-autonomous organelle?

Observe the diagram and answer the following.

• a.Which group of plants exibits these two types of cells?
• b.What is the first product of C4 cycle?
• c.Which enzyme is there in bundle sheath cells and mesophyll cells?

A cyclic process is occurring in C3 plant, which is light dependent, and needs O2. This process doesn’t produce energy rather it consumes energy.

• a.Can you name the given process?
• b.Is it essential for survival?
• c.What are the end products of this process?
• d.Where does it occur?