Plant Physiology Practice Questions
Thanaweya Amma (Egypt) · Thanaweya Biology · 134 free MCQs with instant results and detailed explanations.
134
Total
35
Easy
66
Medium
33
Hard
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Sample Questions from Plant Physiology
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What is the primary process through which plants convert light energy into chemical energy?
A.
Photosynthesis
B.
Respiration
C.
Transpiration
D.
Fermentation
Show Answer & Explanation
Correct Answer: A
Photosynthesis is the process where plants use sunlight to convert carbon dioxide and water into glucose and oxygen, making it the primary way they convert light energy into chemical energy.
Q2
Easy
Which part of the plant is primarily responsible for water absorption?
A.
Roots
B.
Leaves
C.
Stem
D.
Flowers
Show Answer & Explanation
Correct Answer: A
Roots are the primary structures that absorb water from the soil, allowing the plant to maintain hydration and facilitate nutrient uptake.
Q3
Easy
What is the role of chlorophyll in plants?
A.
Absorbs sunlight
B.
Stores nutrients
C.
Transports water
D.
Protects against pests
Show Answer & Explanation
Correct Answer: A
Chlorophyll is the pigment responsible for absorbing sunlight, which is essential for the process of photosynthesis in plants.
Q4
Medium
Which process in plants primarily involves the absorption of water and minerals from the soil?
A.
Photosynthesis
B.
Transpiration
C.
Mineral Uptake
D.
Respiration
Show Answer & Explanation
Correct Answer: C
Mineral uptake involves the absorption of nutrients from the soil through roots, essential for plant growth.
Q5
Medium
What is the primary function of stomata in plants?
A.
Absorb water
B.
Photosynthesis
C.
Gas exchange
D.
Support structure
Show Answer & Explanation
Correct Answer: C
Stomata are small openings on leaves that allow for gas exchange, enabling CO2 intake and O2 release.
Q6
Medium
If a plant is exposed to more light, how does it affect the rate of photosynthesis?
A.
It decreases the rate
B.
It has no effect
C.
It increases the rate until a certain point
D.
It stops photosynthesis
Show Answer & Explanation
Correct Answer: C
Increased light intensity generally enhances the rate of photosynthesis up to a saturation point, beyond which it levels off.
Q7
Medium
What is the role of chlorophyll in plants?
A.
Water absorption
B.
Light absorption for photosynthesis
C.
Nutrient transport
D.
Cell division
Show Answer & Explanation
Correct Answer: B
Chlorophyll is the pigment that absorbs light energy, which is crucial for the process of photosynthesis.
Q8
Hard
Which of the following statements best describes the process of phototropism in plants?
A.
It is the growth response of plants towards light, facilitated by auxins.
B.
It is the movement of plants in response to gravity, influenced by gibberellins.
C.
It involves the opening and closing of stomata due to water availability.
D.
It is the process of leaf abscission triggered by ethylene production.
Show Answer & Explanation
Correct Answer: A
Phototropism is the directional growth of plants toward light, primarily regulated by the hormone auxin, which redistributes in the plant in response to light direction.
Q9
Hard
In a given plant, if the stomatal conductance is measured to be 0.5 mol m-2 s-1 and the internal CO2 concentration is 300 ฮผmol mol-1, what is the estimated rate of photosynthesis in terms of CO2 assimilation if the photosynthetic efficiency is 5 ฮผmol CO2 per mol of water transpired?
A.
2.5 ฮผmol CO2 per second
B.
5 ฮผmol CO2 per second
C.
1.5 ฮผmol CO2 per second
D.
0.25 ฮผmol CO2 per second
Show Answer & Explanation
Correct Answer: A
Using the stomatal conductance and the photosynthetic efficiency, we can calculate the rate of CO2 assimilation: 0.5 mol m-2 s-1 x 5 ฮผmol CO2/mol H2O = 2.5 ฮผmol CO2/s.
Q10
Hard
What is the primary role of the xylem in vascular plants?
A.
Transporting water and nutrients from roots to leaves
B.
Storing food produced during photosynthesis
C.
Facilitating gas exchange during respiration
D.
Transporting sugars from leaves to other parts of the plant
Show Answer & Explanation
Correct Answer: A
The xylem's primary function is to transport water and dissolved minerals from the roots to the leaves, crucial for photosynthesis and maintaining plant health.
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Plant Physiology โ Thanaweya Amma (Egypt) Thanaweya Biology Practice Questions Online
This page contains 134 practice MCQs for the chapter Plant Physiology in Thanaweya Amma (Egypt) Thanaweya Biology. The questions are organized by difficulty โ 35 easy, 66 medium, 33 hard โ so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.