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The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements is involved in this reaction?
1. Magnesium and Chlorine
2. Manganese and Chlorine
3. Manganese and Potassium
4. Magnesium and Molybdenum

Anoxygenic photosynthesis is characteristic of
1. Rhodospirillum
2. Spirogyra
3. Chlamydomonas
4. Ulva

A process that makes important difference between C₃ and C₄ plants is
1. Photosynthesis
2. Photorespiration
3. Transpiration
4. Glycolysis

The correct sequence of cell organelles during photorespiration is
1. Chloroplast, – mitochondria, – peroxisome
2. Chloroplast, – vacuole, – peroxisome
3. Chloroplast, – Golgibodies, – mitochondria
4. Chloroplast, – Rough endoplasmic reticulum, – Dictyosomes

In Kranz anatomy, the bundle sheath cells have
1. Thin walls, no intercellular spaces and several chloroplasts
2. Thick walls, many intercellular spaces and few chloroplasts
3. Thin walls, many intercellular spaces and no chloroplasts
4. Thick walls, no intercellular spaces and large number of chloroplasts

CAM helps the plants in
1. Reproduction
2. Conserving water
3. Secondary growth
4. Disease resistance

PGA as the first CO2 fixation product was discovered in photosynthesis of
1. Alga
2. Bryophyte
3. Gymnosperm
4. Angiosperm

C₄ plants are more efficient in photosynthesis than C₃ plants due to
1. Lower rate of photorespiration
2. Higher leaf area
3. Presence of larger number of chloroplasts in the leaf cells
4. Presence of thin cuticle

Read the following four statements, a, b, c and d and select the right option having both correct statements. Statements:
a. Z scheme of light reaction takes place in presence of PSI only.
b. Only PS I is functional in cyclic photophosphorylation.
c. Cyclic photophosphorylation results into synthesis of ATP and NADPH2
d. Stroma lamellae lack PS II as well as NADP.
Options :
1. B and D
2. A and B
3. B and C
4. C and D

Kranz anatomy is one of the characteristics of the leaves of
1. Potato
2. Wheat
3. Sugarcane
4. Mustard

Study the pathway given below :

In which of the following options correct words for all the three blanks A, B and C are indicated ?

Oxygenic photosynthesis occurs in:
1. Oscillatoria
2. Rhodospirillum
3. Chlorobium
4. Chromatium

Cyclic photophosphorylation results in the formation of
1. ATP and NADPH
2. ATP, NADPH and O₂
3. ATP
4. NADPH

Stroma in the chloroplasts of higher plant contains:
1. Light-dependent reaction enzymes
2. Ribosomes
3. Chlorophyll
4. Light-independent reaction enzymes

The C₄ plants are photosynthetically more efficient than C₃ plants because
1. They have more chloroplasts
2. The CO₂ compensation point is more
3. CO₂ generated during photorespiration is trapped and recycled through PEP carboxylase
4. The CO₂ efflux is not prevented

In leaves of C₄ plants malic acid synthesis during CO₂ fixation occurs in
1. Guard cells
2. Epidermal cells
3. Mesophyll cells
4. Bundle sheath

Electrons from excited chlorophyll molecule of photosystem II are accepted first by
1. Ferredoxin
2. Cytochrome - b
3. Cytochrome - f
4. Quinone

The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is:
1. Quinone
2. Cytochrome
3. Iron-sulphur protein
4. Ferredoxin

In the leaves of C₄ plants, malic acid formation during CO₂ fixation occurs in the cells of:
1. Epidermis
2. Mesophyll
3. Bundle sheath
4. Phloem

In photosystem-I, the first electron acceptor is
1. Ferredoxin
2. Cytochrome
3. Plastocyanin
4. An iron-sulphur protein

During photorespiration, the oxygen consuming reaction(s) occur in
1. Stroma of chloroplasts and mitochondria
2. Stroma of chloroplasts and peroxisomes
3. Grana of chloroplasts and peroxisomes
4. Stroma of chloroplasts

Photosynthesis in C₄ plants is relatively less limited by atmospheric CO₂ levels because :
1. Four carbon acids are the primary initial CO₂ fixation products
2. The primary fixation of CO₂ is mediated via PEP carboxylase
3. Effective pumping of CO₂ into bundle sheath cells
4. RuBisCO in C₄ plants has higher affinity for CO₂

As compared to a C₃ plant, how many additional molecules of ATP are needed for net production of one molecule of hexose sugar by C₄ plants :
1. 2
2. 6
3. 0
4. 12

Photosynthetic Active Radiation (PAR) has the following range of wavelengths :
1. 400 - 700 nm
2. 450 - 950 nm
3. 340 - 450 nm
4. 500 - 600 nm

Chlorophyll-a molecule at its carbon atom 3 of the pyrrole ring II has one of the following
1. Carboxylic group
2. Magnesium
3. Aldehyde group
4. Methyl group