Why can scratching or chipping the seed coat speed up the germination of hard-coated seeds like alfalfa?
A. Bacteria or fungi can enter the seed and release growth factors.
B. Carbon dioxide can enter the seed and stimulate photosynthesis.
C. The mechanical stress activates hydrolytic enzymes.
D. Water and oxygen can enter the seed to reach the embryo more quickly.
E. Damage to the seed coat triggers the aleurone layer to release amylase.
Answer: D
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A xenograft is graft tissue from a donor of one species transplanted to a recipient of another species.
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Fill in the blank(s) with correct word