The correct order of the steps for seed germination is:
- Y: seed absorbs water - The process begins when the seed absorbs water, which activates the enzymes necessary for germination.
- Z: embryo uses stored food - After absorbing water, the embryo begins to utilize the stored nutrients from the seed to fuel its growth.
- W: roots grow down while stems and leaves grow up - Following the use of stored food, the roots start to grow downward and the stem and leaves grow upward.
- X: leaves open up - Finally, the leaves open up to begin the process of photosynthesis.
So the correct sequence is Y, Z, W, X.