The stems wer kept in the dark after the tips were replaced. Explain why.
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Card 17
Front
Plant hormones have several commercial uses. Explain why plant growth hormones are used to make selective weedkillers.
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Card 18
Front
Name one other commercial use for plant growth hormones.
Back
Card 19
Front
To keep cells working properly, the ion content of the body and the body temperature must be kept constant. 1.Which organ is responsible for regulating the ion content of the blood? 2.Which organ is responsible for regulating body temperature?
