A student conducted an investigation to study phototropism in grasses. The only difference between the control group and the exp
erimental group was light conditions. The control group was provided full light, while the experimental group was shaded on one side. The diagrams show the average heights and positions of blades of grass in the investigation. Which statement best explains why the grass tips of the experimental group bent toward the light? a) Water evaporated faster on the side of the plant having full light.
b) Light sensors in the grass tips stimulated a hormone in the shoot system.
c) The xylem in the root system absorbed more nutrients from the shaded side.
d) The side facing the light has a greater chance of absorbing carbon dioxide from the atmosphere.
Phototropism refers to the movement of plants in response to light. The mechanism of phototropism involves the photoreceptors which respond to a different wavelength of light: the phytochromes to red light, cryptochromes to blue light and the phototropin to the UV light.
Plants integrate the signals obtained from these receptors and then activates the gene which will be involved in the phototropism.
The gene could be the production of the auxin hormone and the PIN proteins which helps in the distribution of the auxin in the plants. Due to the production of this hormone and its distribution in the shoot, the grass tips bend towards the light.
needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population. If they are met, natural selection automatically results.
Cuando se queman los fósiles, el carbón e hidrógeno reaccionan con el oxígeno produciendo dióxido de carbono (CO2) y agua (H2O). Durante esta reacción se produce calor. La electricidad se genera mediante la transformación de energía mecánica (calor) con energía eléctrica por medio de una turbina o generador.
