BPSC CCE Prelims
Plant Physiology Previous Year Questions (PYQs)
Practice solved questions for Plant Physiology with detailed step-by-step solutions, key insights, and trend analysis for BPSC CCE PRELIMS.
Solved Previous Year Questions
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Pollination is best defined as
Detailed Explanation:
Pollination is precisely defined as the transfer of pollen grains from the anther (male part) to the stigma (female part) of a flower. This is the actual act of pollination, distinct from subsequent reproductive processes.
Germination of pollen grains and growth of the pollen tube occur after pollination is complete. Insect visitation is merely a mechanism (agent) of pollination, not the process itself.
Therefore, the transfer of pollen grain from anther to stigma is the correct definition, making Option 4 the correct answer.
Plants receive their nutrients mainly from
Detailed Explanation:
Soil is the primary source of essential mineral nutrients for plants, including nitrogen, phosphorus, potassium, calcium, magnesium, and micronutrients like zinc and iron. These nutrients are absorbed by roots in ionic forms dissolved in soil water.
The atmosphere provides carbon dioxide for photosynthesis, and light drives photosynthesis, but neither supplies mineral nutrients. Chlorophyll is a pigment that captures light energy, not a nutrient source.
Therefore, soil is the main nutrient reservoir for plants, making Option 3 the correct answer.
Water passes from the soil into the roots by a physical process called
Detailed Explanation:
Water moves from soil into plant roots through osmosis, a process where water molecules pass through a semi-permeable membrane (root cell walls) from a region of higher water concentration (soil) to lower water concentration (root cells).
Diffusion involves movement of particles from high to low concentration but does not require a semi-permeable membrane. Absorption is a general term for uptake, while transpiration is water loss from leaves through stomata—not water uptake.
Therefore, osmosis is the specific physical process for water uptake by roots, making Option 4 the correct answer.
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In the nighttime, it is advised not to sleep under trees because
Detailed Explanation:
During photosynthesis (daytime), plants absorb CO₂ and release O₂. At night, photosynthesis stops, but respiration continues—plants absorb O₂ and release CO₂, just like animals.
In enclosed or poorly ventilated spaces, this can slightly increase CO₂ levels and reduce oxygen concentration, making it uncomfortable to sleep under trees indoors or in confined areas.
Therefore, trees liberate carbon dioxide at night through respiration, making Option 3 the correct answer.
Stem of a plant helps in distributing food to all parts of the plant. It also helps in
Detailed Explanation:
The stem of a plant serves multiple functions: it transports water and nutrients from roots to leaves, distributes food (prepared by leaves during photosynthesis) to all parts, and stores food in the form of starch in tissues like parenchyma (e.g., potato, ginger, sugarcane stems).
While stems contribute to plant shape and contain lenticels for respiration, and green stems assist in photosynthesis, the question explicitly asks what stem helps with beyond distribution—making food storage the primary additional function.
Therefore, storing food is the key function alongside distribution, making Option 1 the correct answer.
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