True or false: 1. chemicals produced by a plant that control its growth a d development are called hormones.2. a plant's roots grow away from a rock they hit in the soil. this is an example of positive thigmotropism.3. chlorophyll speeds up that rate at which a plant's cells grow and controls a plant's response to light.4. the critical night length for a certain plant is 10 hours. this plant will flower only when nights are shorter than 10 hours.5. a plant's adaptation that it survive freezing temperatures and lack liquid of water is dormancy. 6. the blooming of poinsettias in winter and irises in spring is an example of phototropism. and

Chemicals produced by a plant that control its growth and development are called hormones. → True

A plant's roots grow away from a rock they hit in the soil. This is an example of positive thigmotropism.→ False

Chlorophyll speeds up the rate at which a plant's cells grow and controls a plant's response to light. → False

The critical night length for a certain plant is 10 hours. This plant will flower only when nights are shorter than 10 hours. → False, the plant will flower if the night length is longer than 10 hours.

A plant's adaptation that helps it survive freezing temperatures and lack liquid water is dormancy. → True

The blooming of poinsettias in winter and irises in spring is an example of phototropism. → False, the blooming of poinsettias in winter is as a result of photoperiodism

Plant hormones are chemicals produced by the plant for the control of plant growth and development.

Learn more about Plant hormones here:

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a (congress) should be your answer since they make all federal laws in the u.s.