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- 1. Multiple Choice
The image is a cross section through an Ammophila leaf, which grows on coastal sand dunes.
What feature suggests that Ammophila is a xerophyte?
A. The leaf surface area is increased.
B. The rolled leaf reduces the upper epidermis area.
C. The rolled leaf protects the lower epidermis from the wind.
D. The lower epidermis can transpire more easily.
- 2. Multiple Choice
In the micrograph of a plant stem, which letter indicates the xylem?
A.
B.
C.
D.
- 3. Multiple Choice
Which process is most responsible for movement of water from roots to leaves of a plant on a hot sunny day?
A. Active translocation of mineral ions in roots
B. Active transport of organic compounds into sieve tubes
C. Raised hydrostatic pressure gradients
D. Evaporation of water from mesophyll cell walls
A.
B.
C.
D.
- 4. Multiple Choice
The graph shows the percentage of stomata that are open in two different species of plants over a 24-hour period.
What does this graph show about plants X and Y?
A. Plant X absorbs most carbon dioxide at night.
B. Plant Y is adapted to desert conditions.
C. Plant X photosynthesises most at midday.
D. Plant Y only respires during the day.
- 5. Multiple Choice
The image shows part of a section through the stem of a non-woody plant. Where does transport of sucrose occur?
A.
B.
C.
D.
- 6. Multiple Choice
The apparatus in the diagram was used to assess the effects of factors on transpiration rates.
Which factor would be a controlled variable in an experiment designed to assess the effects of temperature on transpiration rate?
A. The opening and closing of stomata
B. The opening and closing of stomata
C. The height of the water in the reservoir
D. The evaporation of water from the leaves
- 7. Multiple Choice
Excessive irrigation can cause increased salinity in the soil. What effect does this have on water transport in the plant roots?
A. Decreases movement of water from soil into the root
B. Absorption of water with a higher solute concentration
C. Increases movement of water from soil into the root
D. Absorption of water with a lower solute concentration
- 8. Multiple Choice
Which is the most efficient way for some desert plants to conserve water?
A. By having no leaves, so water evaporates from the green stem with less surface
B. By loading organic compounds in the phloem of the roots
C. By accumulating salt within their tissues, so water is retained by osmosis
D. By growing long hair on their surface, so air moisture is absorbed at night
- 9. Multiple Choice
What is transported in xylem tissue?
A. Sucrose from leaves to fruits
B. Starch from leaves to storage organs
C. Water from roots to leaves
D. Salts from soil to roots
- 10. Multiple Choice
Which abiotic factors affect transpiration in plants?
A. temperature, humidity and wind
B. pH, temperature and salinity
C. light, pH and humidity
D. humidity, temperature and salinity
- 11. Multiple Choice
The diagram below shows a cross section of a stem. What is the structure labelled Y and one of its functions?
A. Structure Y: Phloem, function: storage of water and starch
B. Structure Y: xylem, function: mechanical support
C. Phloem, gas exchange
D. Xylem, transport of sugars
A.
B.
C.
D.
- 12. Multiple Choice
Under which conditions would the rate of transpiration be greatest?
A. Humid and cool with wind
B. Dry and hot with wind
C. Dry and hot with no wind
D. Humid and cool with no wind
- 13. Multiple Choice
How do mineral ions in the soil move into the root?
A. Osmosis
B. Mass flow of water
C. Translocation
D. Through phloem
- 14. Multiple Choice
What is a role of xylem?
A. It absorbs minerals from the soil by active transport.
B. It translocates amino acids from source to sink.
C. It carries glucose to the leaves.
D. It contributes to the plant support with lignified walls
- 15. Multiple Choice
Cobalt chloride paper is blue when dry but turns pink with water. Blue cobalt chloride paper was fastened to the upper and lower surfaces of a plant leaf. After 20 minutes, many small pink dots were observed on the paper on the lower surface, and a few pink dots were seen on the upper surface. What conclusions can be drawn?
I. There are more stomata on the lower surface than on the upper surface.
II. Stomata on the upper surface are blocked by the waxy cuticle.
III. More transpiration occurs through the lower surface than through the upper surface.
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
- 16. Multiple Choice
Which process and cause are responsible for water uptake by the roots?
A.
B.
C.
D.
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