5 questions from past BPSC papers, each with the correct answer and an
explanation of why. Free to read — no signup.
How often it has appeared
Paper
67
68
70
71
70Re
Total
Plant Physiology
4
6
2
3
3
18
Questions
68th Pre · 2023
In lichen, a chlorophyll-containing partner ___ live together.
Alga and a fungus
Fungus and a bacterium
Alga and a virus
Alga and a moss
Why: Symbiosis: alga + fungus.
68th Pre · 2023
Stomata open or close due to change in
Position of nucleus in cells
Protein composition of cells
Amount of water in cells
Chlorophyll concentration
Why: Guard cell turgor.
68th Pre · 2023
Chlorophyll absorbs ___ wavelengths of sunlight.
Red and blue
Green and blue
Green and red
Yellow only
Why: Reflects green; absorbs red & blue.
70th Re-Exam · 2025
Quinine for malaria is obtained from which part of plant?
Leaves
Root
Stem bark
Flower
Why: Cinchona bark.
70th Pre · 2024
Which fertilizer component stimulates early growth?
Potassium
Nitrogen
Oxygen
Phosphorus
Why: Phosphorus — root growth.
Study these topics in order, and remember them
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