Plant Physiology Practice Questions
HSC/SSC (Bangladesh) · HSC Biology · 139 free MCQs with instant results and detailed explanations.
139
Total
40
Easy
68
Medium
31
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 main function of xylem in plants?
A.
Transport of food
B.
Transport of water
C.
Storage of nutrients
D.
Photosynthesis
Show Answer & Explanation
Correct Answer: B
Xylem primarily functions in the transport of water and minerals from the roots to other parts of the plant.
Q2
Easy
What is the primary function of stomata in plants?
A.
Gas exchange
B.
Water storage
C.
Nutrient absorption
D.
Root anchorage
Show Answer & Explanation
Correct Answer: A
Stomata are small openings on the surfaces of leaves that facilitate the exchange of gases (oxygen and carbon dioxide) during photosynthesis and respiration.
Q3
Easy
Which of the following is an essential nutrient for plant growth?
A.
Oxygen
B.
Nitrogen
C.
Carbon Dioxide
D.
Water
Show Answer & Explanation
Correct Answer: B
Nitrogen is a crucial macronutrient for plants as it is a key component of amino acids, proteins, and nucleic acids, which are essential for growth and development.
Q4
Medium
Which of the following is primarily responsible for the process of photosynthesis in plants?
A.
Chlorophyll
B.
Cellulose
C.
Glucose
D.
Starch
Show Answer & Explanation
Correct Answer: A
Chlorophyll is the pigment found in plants that absorbs light energy, which is essential for photosynthesis. It facilitates the conversion of light energy into chemical energy.
Q5
Medium
In which part of the plant does the majority of water absorption occur?
A.
Leaves
B.
Roots
C.
Stems
D.
Flowers
Show Answer & Explanation
Correct Answer: B
The roots of the plant are primarily responsible for water absorption due to their extensive surface area and specialized root hairs that enhance water uptake.
Q6
Medium
What is the role of stomata in plant physiology?
A.
Photosynthesis
B.
Water retention
C.
Gas exchange
D.
Mineral absorption
Show Answer & Explanation
Correct Answer: C
Stomata are small openings on the surfaces of leaves that facilitate gas exchange, allowing carbon dioxide to enter for photosynthesis and oxygen to exit.
Q7
Medium
Which of the following hormones is primarily responsible for promoting cell elongation in plants?
A.
Ethylene
B.
Gibberellins
C.
Auxins
D.
Cytokinins
Show Answer & Explanation
Correct Answer: C
Auxins are plant hormones known to promote cell elongation, especially in stems, contributing to growth and development in plants.
Q8
Hard
Which of the following statements best describes the role of auxins in plant growth?
A.
Auxins promote cell elongation by loosening cell walls.
B.
Auxins inhibit root growth to encourage stem development.
C.
Auxins induce flowering only in long-day plants.
D.
Auxins are solely responsible for fruit ripening.
Show Answer & Explanation
Correct Answer: A
Auxins are plant hormones that play a critical role in promoting cell elongation by loosening the cell walls, which facilitates growth. This process is essential for various growth responses, including phototropism.
Q9
Hard
In a specific experiment, a plant is exposed to varying light intensities. If the rate of photosynthesis increases with light intensity up to a certain point, which law does this scenario best illustrate?
A.
Law of Limiting Factors
B.
Law of Independent Assortment
C.
Law of Conservation of Mass
D.
Law of Diminishing Returns
Show Answer & Explanation
Correct Answer: A
The Law of Limiting Factors states that the rate of a biological process is limited by the factor that is in the least supply. In this case, light intensity increases the rate of photosynthesis until other factors become limiting.
Q10
Hard
Which of the following statements best describes the role of auxins in plant growth?
A.
Auxins promote cell elongation and are involved in plant tropisms.
B.
Auxins inhibit the growth of all plant tissues.
C.
Auxins are primarily responsible for photosynthesis in leaves.
D.
Auxins control the opening and closing of stomata.
Show Answer & Explanation
Correct Answer: A
Auxins are plant hormones that primarily promote cell elongation and play a crucial role in plant tropisms, such as phototropism and gravitropism. They are not responsible for inhibiting growth, photosynthesis, or stomatal movement.
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Plant Physiology — HSC/SSC (Bangladesh) HSC Biology Practice Questions Online
This page contains 139 practice MCQs for the chapter Plant Physiology in HSC/SSC (Bangladesh) HSC Biology. The questions are organized by difficulty — 40 easy, 68 medium, 31 hard — 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.