F5 Biology C1 & C2

Diagram shows an apparatus set-up of an experiment. Which of the following factor causes the air bubbles to move from X to Y in the shortest period of time?

• Surrounding temperature

  decrease

• Relative humidity increase

• Light intensity decrease

• Air movement increase

Why increased humidity can lower transpiration rates?

• Smaller stoma openings

• Larger stoma openings

• Water molecules have high kinetic energy

• The air space is saturated with water vapor

Which ions involves in the opening and closing of stomata?

• Sodium ion

• Calcium ion

• Potassium ion

• Chloride ion

Which of the following that causes stoma state as in the diagram?

• Water diffuses out from the guard cells

• The osmotic pressure of the guard cells

  increases

• The osmotic pressure of the guard cells

  decreases

• Water diffuses into the guard cells

Which of the following is the importance of secondary growth?

• Allows the plant to achieve maximum height

• Allow the plant to develop flower and leaves

• Increase the diameter bark for stability

• Increase the diameter bark for stability

Diagram shows the cross section of leaf.

What is X?

• Spongy mesophyll cell

• Palisade mesophyll cell

• Guard cell

• Stomata

Diagram shows the cross section of leaf.

What is Y?

• Spongy mesophyll cell

• Palisade mesophyll cell

• Guard cell

• Stomata

Diagram shows the cross section of leaf.

Which of the following is NOT the function of Z?

• Control the opening and closing of stomata

• Transpiration

• To allow the gaseous exchange

• To carry out photosynthesis

Which of the following is the importance of primary growth to plant?

• Produce more xylem and phloem tissues

• Provides stability to plant by increasing the stem and root diameter to suit the height.

• Produce stronger and thicker bark

• Allows maximum elongation of plants to absorb sunlight for photosynthesis

Diagram shows a cross section of a leaf. This plant is exposed to dust from a nearby housing construction site. What is the effect on photosynthesis if structure X is covered with dust from the construction site?

• The production of starch increases

• The production of sucrose decreases

• The release of oxygen to the environment increases

• The release of carbon dioxide to the environment decreases