The diagram shows the events in the Calvin cycle. What are X and Y respectively?

Phosphoglyceric acid; Triose phosphate

Triose phosphate; Phosphoglyceric acid

The yield of greenhouse crops is higher than that of field crops due to increased photosynthetic activity by the plants. Which TWO of the following factors MOST likely contribute to this?

Humid air and moist soil conditions

Higher than average carbon dioxide levels

Constant application of farmyard manure

Which of the following combinations correctly describes the MAIN factors affecting the rate of photosynthesis?

Light intensity and temperature

Carbon dioxide concentration and state of the stomata

Phytochromes and the availability of ions

The Calvin cycle is temperature dependent because

enzymes involved in the reaction are affected by changes in temperature

increased temperature increases the diffusion of carbon dioxide

increased temperature increases the rate of collision of molecules

the reduction of glycerate phosphate to triose phosphate requires high temperature

High oxygen concentration can limit photosynthesis by preventing the formation of glycerate phosphate. This is due to

oxygen combining with Rubisco instead of carbon dioxide

the oxidation of reduced NADP by oxygen

oxygen combining with RuBP instead of carbon dioxide

triose phosphate which cannot regenerate RuBP in high oxygen concentration

The spongy mesophyll is the chief site of gaseous exchange in a dicotyledonous leaf. This is possible because the cells are

found near the lower surface of the leaf

irregular in shape and tightly packed

elongated in shape and vertically packed

found near the upper surface of the leaf

The function of the light dependent reaction in photosynthesis is to

produce electrons to stabilize the photosystems

An investigation of the effect of light intensity and temperature on the rate of photosynthesis of a suspension of Chlorella cells showed that at higher light intensities, the cells photosynthesized much faster at 20 degrees Celsius than at 15 degrees Celsius. This is because

photosynthesis is an enzyme controlled process

carbon dioxide diffuses at higher temperatures

high temperatures favour high transpiration rates

higher light intensities increase the rate of photolysis of water

Which of the following combinations correctly identifies Cell X and its importance in photosynthesis?

Palisade - contains photosynthetic pigments

Spongy - contains numerous chloroplasts

Spongy - contains photosynthetic pigments

Palisade - contains numerous mitochondria

Which of the following correctly outline the roles of chloroplasts in photosynthesis?

They are the sites of conversion of light energy to ATP.

Involved in cyclic and non-cyclic photophosphorylation

Absorb light mainly in the green part of the spectrum.

ATP is often described as the 'universal energy currency of cells'. An important feature of ATP is that it

couples catabolic and anabolic processes

takes part in a limited number of metabolic reactions

When non-cyclic photophosphorylation occurs

light energy in the green region of the light spectrum is absorbed

The knowledge of the limiting factors which affect the rate of photosynthesis of a particular plant species CANNOT be used directly to

produce disease resistant plants

increase the food yield of the plant

During photosynthesis, P680 emits electrons that

can be recycled directly to P680

Which of the following is true about the thylakoid?

It is involved in the light-dependent reaction of photosynthesis

It manufactures enzymes for the process of photosynthesis

It is involved in the light-independent reaction of photosynthesis

Photosynthesis

Authored by Krishna Kumar

Biology

University

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MULTIPLE SELECT QUESTION

45 sec • 1 pt

Which of these functions correctly describes the role of a dicotyledonous leaf?

Control of transpiration

Removal of poisonous gases from the air

Absorption of radiant energy

Food storage

MULTIPLE SELECT QUESTION

45 sec • 1 pt

Which of the following are products of photophosphorylation?

ATP

ADP

NADP

NADPH

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

On a warm, sunny day, photosynthesis is limited by

temperature

light intensity

oxygen availability

carbon dioxide availability

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the chloroplast, where are photosystems located?

III

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The role of the antenna complex in Photosystems I and II is to

produce oxygen

regenerate RuBP

produce carbohydrates

collect light energy

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following occur in the Calvin cycle?

Fixation of carbon dioxide and production of ATP

Fixation of carbon dioxide and regeneration of RuBP

Oxidation of NADPH and production of ATP

Reduction of NADP and regeneration of RuBP

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The graph shows the effects of increasing light intensity on the rate of photosynthesis. At which of the labelled stages would light be a limiting factor?

III

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Photosynthesis

Which of these functions correctly describes the role of a dicotyledonous leaf?

Which of the following are products of photophosphorylation?

On a warm, sunny day, photosynthesis is limited by

In the chloroplast, where are photosystems located?

The role of the antenna complex in Photosystems I and II is to

Which of the following occur in the Calvin cycle?

The graph shows the effects of increasing light intensity on the rate of photosynthesis. At which of the labelled stages would light be a limiting factor?

The diagram shows the events in the Calvin cycle. What are X and Y respectively?

The yield of greenhouse crops is higher than that of field crops due to increased photosynthetic activity by the plants. Which TWO of the following factors MOST likely contribute to this?

In the chloroplast, ribulose bisphosphate carboxylase can be found in region

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