A dormant seed of a desert plant imbibes water but fails to germinate even under optimal temperature and oxygen availability. Which of the following is the MOST LIKELY explanation for this continued dormancy?
Insufficient light exposure to trigger phytochrome conversion.
Presence of inhibitors like abscisic acid in the seed coat.
Immature embryo requiring a period of after-ripening.
Hard seed coat impermeable to oxygen, preventing respiration.
Related Questions
The hard seed coat of some seeds acts as a barrier to:
Water uptake only
Oxygen uptake only
Both water and oxygen uptake
Light penetration
Which of the following is not an inhibitory substance governing seed dormancy ?
Gibberellic acid
Abscisic acid
Phenolic acid
Para-ascorbic acid
Which type of dormancy is caused by the presence of chemical inhibitors in the seed?
Physical dormancy
Morphological dormancy
Physiological dormancy
Chemical dormancy
Seed dormancy is an adaptation that primarily ensures:
Immediate germination upon seed dispersal
Germination under favorable environmental conditions
Prevention of seed predation
Increased seed dispersal distance
Which of the following combinations of factors is MOST LIKELY to break seed dormancy in a species exhibiting combinational dormancy?
Exposure to high temperatures followed by gibberellic acid application.
Scarification followed by exposure to high oxygen levels.
Cold stratification followed by exposure to light.
Soaking in water followed by exposure to ethylene.
Some seeds require a specific duration of light exposure to germinate. If a flash of red light (R) is given, followed immediately by a flash of far-red light (FR), what is the MOST LIKELY effect on germination?
Germination will be stimulated.
Germination will be inhibited.
Germination will be unaffected.
The effect will depend on the seed species.
A researcher observes that a batch of dormant seeds fails to germinate even after scarification and exposure to favorable conditions. Suspecting the presence of a volatile inhibitor, which experimental setup is MOST appropriate to confirm this hypothesis?
Grind the dormant seeds and apply the extract to non-dormant seeds.
Place the dormant seeds in a closed container with non-dormant seeds of a different species and observe germination rates.
Expose the dormant seeds to high concentrations of ethylene gas.
Soak the dormant seeds in a solution of gibberellic acid.
Which one of the following inhibits seed germination for a particular period?
Light
Water
Caron dioxide
Dormancy
For cryopreservation, plant materials are frozen at
Which of the following is NOT a method used by seeds to overcome dormancy?
Scarification of the seed coat
Stratification (exposure to cold)
Exposure to ethylene
Exposure to appropriate light conditions
