Which process describes the seed’s uptake of water before germination?

Which process describes the seed’s uptake of water before germination?

• A. Embolism
• B. Imbibition
• C. Respiration
• D. Translocation

Answer: (B)

Imbibition is the seed’s uptake of water before germination. It’s a physical process driven by a water potential gradient: a dry seed has very low internal water content, so when it contacts moist surroundings, water enters by osmosis, causing the seed to swell and the seed coat to soften or crack. This rehydration reactivates metabolism—enzymes become active, stored reserves are mobilized, and energy production begins—so the seed can start growing once conditions favor germination. Embolism involves air bubbles blocking water transport and isn’t about the seed’s initial water uptake; respiration happens after metabolic activity resumes to release energy, and translocation is the movement of sugars within the plant, not the seed’s water uptake.

Imbibition is the seed’s uptake of water before germination. It’s a physical process driven by a water potential gradient: a dry seed has very low internal water content, so when it contacts moist surroundings, water enters by osmosis, causing the seed to swell and the seed coat to soften or crack. This rehydration reactivates metabolism—enzymes become active, stored reserves are mobilized, and energy production begins—so the seed can start growing once conditions favor germination. Embolism involves air bubbles blocking water transport and isn’t about the seed’s initial water uptake; respiration happens after metabolic activity resumes to release energy, and translocation is the movement of sugars within the plant, not the seed’s water uptake.