Plant Biology (AHL)
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Transport in the xylem of plants
SubtopicTransport in the xylem of plants under Plant Biology (AHL) for Grade 12 IB.
Preview questions (no answers)
- 1.
In which direction does the sap in the xylem move?
A.From the leaves to the roots only
B.Bidirectionally between the source and the sink
C.From the roots to the leaves only
D.Laterally from the phloem to the cortex
- 2.
What is the primary function of lignin in the xylem of vascular plants?
A.To store starch for the plant during winter
B.To facilitate the active transport of sucrose
C.To act as a waterproof layer for the phloem
D.To strengthen the vessel walls to prevent collapse under low pressure
- 3.
Which property of water allows it to stick to the cellulose in the walls of xylem vessels, helping to counter the force of gravity?
A.Adhesion
B.Cohesion
C.Surface tension
D.Thermal conductivity
Download the worksheet for Plant Biology (AHL) - Transport in the xylem of plants to practice offline. It includes additional chapter-level practice questions.
Transport in the phloem of plants
SubtopicTransport in the phloem of plants under Plant Biology (AHL) for Grade 12 IB.
Preview questions (no answers)
- 1.
Which structural feature of sieve tube elements allows for the low-resistance flow of phloem sap between adjacent cells?
A.Lignified cell walls
B.Sieve plates
C.Casparian strips
D.Large central vacuoles
- 2.
Based on the diagram of the pressure-flow mechanism, what does the label 'B' represent?
A.Phloem sieve tube
B.Xylem vessel
C.Companion cell
D.Stoma
- 3.
In the context of translocation, which of the following would be considered a 'sink'?
A.Mature photosynthetic leaves
B.Developing fruit
C.Green stems in summer
D.A germinating seed providing nutrients to a seedling
Download the worksheet for Plant Biology (AHL) - Transport in the phloem of plants to practice offline. It includes additional chapter-level practice questions.
Growth in plants
SubtopicGrowth in plants under Plant Biology (AHL) for Grade 12 IB.
Preview questions (no answers)
- 1.
What is the name of the technique used to produce large numbers of identical plants from small pieces of stock plant tissue?
A.Cross-pollination
B.Micropropagation
C.Grafting
D.Hydroponics
- 2.
In plant growth, what is the primary role of the hormone auxin (IAA)?
A.To promote the ripening of fruit
B.To trigger the closing of stomata during drought
C.To control the growth of stems by promoting cell elongation
D.To inhibit the germination of seeds in winter
- 3.
Where are the undifferentiated cells found that allow for primary growth in the length of a plant stem?
A.Vascular cambium
B.Lateral meristems
C.Shoot apical meristems
D.Cork cambium
Download the worksheet for Plant Biology (AHL) - Growth in plants to practice offline. It includes additional chapter-level practice questions.
Reproduction in plants
SubtopicReproduction in plants under Plant Biology (AHL) for Grade 12 IB.
Preview questions (no answers)
- 1.
Based on the functions provided in the diagram, which part of the flower is responsible for the production of male gametes?
A.Part A
B.Part B
C.Part C
D.Part D
- 2.
Which of the following sets of conditions are all essential for the germination of most seeds?
A.Light, carbon dioxide, and water
B.Water, oxygen, and an appropriate temperature
C.Soil, water, and mineral ions
D.Oxygen, light, and fertilizer
- 3.
Which part of the flower typically develops into the fruit following successful fertilization?
A.The ovule
B.The ovary
C.The receptacle
D.The stamen
Download the worksheet for Plant Biology (AHL) - Reproduction in plants to practice offline. It includes additional chapter-level practice questions.