One of the functions of water in seed germination is to?

Step 1: Analyze the question The question asks about one function of water in seed germination. Germination starts when a dormant seed resumes active growth.

Step 2: Explain the concept A dry seed has very little water, so its metabolism is almost shut down. When the seed takes in water (imbibition), several things happen:

• The seed coat softens and swells, and eventually bursts.
• The enzymes in the seed become activated (for example, amylase).
• The activated enzymes break down stored food (starch, proteins, fats) into soluble forms.
• These soluble foods are transported to the growing embryo (radicle and plumule), which uses them for growth and energy.

Step 3: Evaluate each option

• A. Dilute the embryo: Wrong. Water does not dilute the embryo. It hydrates the tissues so metabolism can start.
• B. Make the soil wet and soft: Wrong. This describes the soil, not a function of water inside the seed.
• C. Activate the enzymes: Correct. Water activates the enzymes that digest stored food and drive germination.
• D. Promote aerobic respiration: Not the best answer. Oxygen is what is needed for aerobic respiration. Water supports metabolism in general, but its direct role is as a medium that activates enzymes.

Step 4: Answer The correct option is C. activate the enzymes.

Tip: Remember the three needs of germination: water, oxygen, and suitable temperature. Water's job is to activate enzymes and soften the seed coat. Oxygen's job is respiration. Matching each factor to its job helps you avoid trap options like D.