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.
Which part of the plant provides the surface for the evaporation that drives the transpiration pull?
A.Cell walls of the mesophyll
B.The outer surface of the cuticle
C.The vascular bundles in the stem
D.The root cap
- 2.
What is the relationship between the water potential of soil and the water potential of root hair cells in a healthy plant?
A.Soil has a higher water potential than the root cells.
B.Soil has a lower water potential than the root cells.
C.Water potentials are always equal.
D.Roots have a water potential of zero.
- 3.
In which form is water primarily transported within the xylem?
A.Liquid
B.Vapor
C.Ice
D.Combined with glucose
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.
What occurs when the solute concentration in the phloem decreases at the sink?
A.The water potential increases and water leaves the phloem
B.The water potential decreases and water enters the phloem
C.The pressure increases
D.Sucrose is converted to starch in the phloem
- 2.
Which part of the plant would have the highest hydrostatic pressure in its phloem during a sunny day?
A.A growing root tip
B.A mature photosynthesizing leaf
C.A developing fruit
D.The dormant terminal bud
- 3.
What is the function of the sieve plate's pores?
A.To filter out large molecules
B.To allow for the flow of sap between elements
C.To prevent water from entering the phloem
D.To store starch
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.
Which plant hormone was the first to be discovered and is known to regulate many aspects of growth?
A.Auxin
B.Gibberellin
C.Abscisic acid
D.Ethylene
- 2.
What happens to the genetic makeup of the plants produced by micropropagation compared to the parent plant?
A.They are genetically identical clones
B.They have half the number of chromosomes
C.They have a completely different DNA sequence
D.They are 50% identical
- 3.
In a root, where is the highest concentration of auxin found when the root is placed horizontally?
A.On the upper side
B.On the lower side
C.In the middle
D.At the very tip only
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.
Which part of the flower is collectively called the stamen?
A.Stigma and Style
B.Anther and Filament
C.Ovary and Ovule
D.Sepal and Petal
- 2.
The conversion of to during the night is used by plants to:
A.Produce energy for growth
B.Measure the length of the dark period
C.Attract pollinators
D.Speed up photosynthesis
- 3.
What happens to the maltose produced during germination?
A.It is converted into glucose for use by the embryo
B.It is stored in the testa
C.It is released into the atmosphere
D.It is converted back into starch immediately
Download the worksheet for Plant Biology (AHL) - Reproduction in plants to practice offline. It includes additional chapter-level practice questions.