Question

1. what is the function of phytochromes?

chemicals used to sense darkness
pigments that absorb light energy from the sun
hormones that promote cell elongation
accessory pigments that help in photosynthesis

Explanation:

Phytochromes are photoreceptors in plants that detect light. They are sensitive to red and far - red light. Their main function is to sense light conditions. Among the options, "chemicals used to sense darkness" is incorrect as they sense light. "Pigments that absorb light energy from the Sun" is more characteristic of chlorophyll (the main pigment for photosynthesis). "Hormones that promote cell elongation" is the function of auxins. Phytochromes are not accessory pigments for photosynthesis.

Answer:

chemicals used to sense darkness