4. Plant roots are positively gravitropic; what does this mean?   a. They are positively attracted to soil. b. They grow toward the direction of gravity. c. They grow away from other plant roots. d. They grow in the opposite direction to sunlight.   5. Plant shoots are positively phototropic; what does this mean?   a. They grow toward a light stimulus. b. They grow toward other brightly colored plants. c. They grow away from bright sunlight. d. They reflect the majority of the wavelengths of light.   6. Which of the following is correct about plant roots?   a. Plant roots are positively phototropic and negatively gravitropic. b. Plant roots are negatively phototropic and positively gravitropic. c. Plant roots are positively hydrotropic and negatively gravitropic. d. Plant roots do not display any major tropisms.

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Plant sensory system

The plant sensory system is a sophisticated system that responds to environmental stimuli such as light,temperature, gravity, and touch. Research predicts that plant hormones and signaling mechanisms areresponsible for this regulation system in plants.