HORTICULTURE SCIENCE
PLANT BIOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
more auxin diffuses to the shaded side to increase cell elongation
|
|
|
more auxin diffuses to the unshaded side to increase cell elongation
|
|
|
more auxin diffuses to the shaded side to decrease cell elongation
|
|
|
more auxin diffuses to the unshaded side to decrease cell elongation
|
Detailed explanation-1: -The correct answer is Auxin accumulates towards darker side to induce greater cell elongation.
Detailed explanation-2: -The higher concentration of auxin on the shady side causes the plant cells on that side to grow more so it bends toward the light. Because light is the energy source for plant growth, plants have evolved highly sensitive mechanisms for perceiving light.
Detailed explanation-3: -Unidirectional light is thought to induce lateral auxin flow to the shaded side and promotes the growth on that side (Friml et al., 2002b), which seems to be driven by PIN1, PIN3, and ABCB19.
Detailed explanation-4: -The bending of plant towards light is known as phototropism. It is due to plant hormone auxins. When the growing parts of a phototropic plant detect sunlight, auxins (synthesized at the shoot tips) help the cells grow longer.
Detailed explanation-5: -When light comes from an angle, plants will curve toward it to get better access to the light they need to grow. Hormones in the plant’s tissues, called auxins, make cells on the dark side of the plant grow taller, bending the plant toward the light.