What is phototropism?Absorption of light energy by chlorophyllGrowth inhibited by lightGrowth stimulated by gravityGrowth stimulated by light2Which of the following statements correctly describes a plant’s response to gravity? Shoots and roots exhibit negative gravitropismShoots exhibit negative gravitropism, roots exhibit positive gravitropismShoots and roots exhibit positive gravitropismShoots exhibit positive gravitropism, roots exhibit negative gravitropism3What are the effects of the plant hormone auxin? Inhibits root and shoot growthInhibits root growth, stimulates shoot growthStimulates root and shoot growthStimulates root growth, inhibits shoot growth4When investigating the effect of light on seedling growth, which of the following is the independent variable?Number of seedsTemperatureDirection of lightDirection of growth5Which of the following best explains how the movement of auxin stimulates plant shoots to grow towards light directed at one side of the plant? Auxin is distributed evenly across the shoot, stimulating it to grow upwardsAuxin accumulates in the lit side of the shoot, stimulating the cells on this side to grow moreAuxin accumulates in the unlit side of the shoot, stimulating the cells on this side to grow moreAuxin accumulates in the unlit side of the shoot, suppressing growth of the cells on this side

Phototropism is the growth of an organism which responds to a light stimulus. It is most often observed in plants, but can also occur in other organisms such as fungi. The cells on the plant that are farthest from the light have a chemical called auxin that reacts when phototropism occurs. This causes the plant to have elongated cells on the farthest side from the light. Therefore, the correct answer is "Growth stimulated by light".

Gravitropism is a turning or growth movement by a plant or fungus in response to gravity. Roots exhibit positive gravitropism because they grow in the direction of gravitational pull (i.e., downward). Shoots exhibit negative gravitropism because they grow in the direction opposite to that of the gravitational pull (i.e., upward). Therefore, the correct answer is "Shoots exhibit negative gravitropism, roots exhibit positive gravitropism".

Auxins are a class of plant hormones (or plant growth regulators) which play an essential role in coordination of many growth and behavioral processes in the plant's life cycle. They are essential for plant body development, including cell division, elongation and differentiation. Therefore, the correct answer is "Inhibits root growth, stimulates shoot growth".

In an experiment investigating the effect of light on seedling growth, the independent variable is the one that is changed or controlled in a scientific experiment to test the effects on the dependent variable. Here, the independent variable is "Direction of light".

Auxin is a plant hormone produced in the stem tip that promotes cell elongation. Auxin moves to the darker side of the plant, causing the cells there to grow larger than corresponding cells on the lighter side of the plant. This produces a curving of the plant stem tip toward the light, a plant movement known as phototropism. Therefore, the correct answer is "Auxin accumulates in the unlit side of the shoot, stimulating the cells on this side to grow more".