Nutrition in Plants 5107/5078 WS3

The diagram shows a section through a leaf. During photosynthesis, where does the greatest conversion of light energy to chemical energy take place?

• A

• B

• C

• D

Which parts of a leaf contain chlorophyll?

• epidermis and stomata

• epidermis and xylem

• guard cells and xylem

• mesophyll and guard cells

Chlorophyll is a green substance found in the cells of plants. What is the function of chlorophyll?

• It converts glucose to energy.

• It converts light energy into chemical energy.

• It converts oxygen into carbon dioxide.

• It converts starch into glucose.

Which of the following is produced by photosynthesis?

• carbon dioxide

• nitrogen

• sugar (glucose)

• chlorophyll

The diagram shows the tissues in a cross-section of a leaf. Starting with the layer containing the highest number of chloroplasts first and ending with the layer containing no chloroplasts, which sequence of letter shows the distribution of chloroplasts in a leaf?

• X→Y→W→Z

• X→Y→Z→W

• Y→X→W→Z

• Z→Y→X→W

The graph shows the effect of varying light intensity on photosynthesis. Which environmental factors could be limiting the rate of photosynthesis between points X and Y?

• carbon dioxide concentration

• light intensity

• temperature

The diagram shows an investigation using an aquatic plant.

What is the main gas present at Y?

• air

• carbon dioxide

• nitrogen

• oxygen

The graph shows the rate of photosynthesis plotted against an unknown factor. Which factor is limiting the rate of photosynthesis as shown in the graph?

• carbon dioxide concentration

• light intensity

• number of chloroplasts

• temperature

Which chemical change takes place in green plants but not in animals?

• glucose → cellulose

• glucose → glycogen

• glycogen → glucose

• glycogen → cellulose

The photomicrograph shows a section through a leaf. Which labelled cell has the function shown?

• Cell 1: absorption of light

• Cell 2: transport of sucrose

• Cell 3: transport of water

• Cell 4: synthesis of carbohydrate

Answer explanation

Palisade mesophyll cells make glucose during photosynthesis. Glucose is a carbohydrate.