Lab 6: plants What hormone is responsible for gravitropism and phototropism? Dic
ID: 276095 • Letter: L
Question
Lab 6: plants What hormone is responsible for gravitropism and phototropism? Dicots vs monocots phototrophic response: why do they look the way they do? (hint: location of apical meristem) .How do gravitropism and phototropism affect plant growth in different parts of the plant? (roots, shoots, leaves, etc.) . Plant in box with light source: what happened? . Corn clock: what happened/what was expected? . What plants exhibit negative phototropism? . Where does auxin concentrate in the roots and shoots to induce bending? Terms: apical meristem, apical dominance, axillary buds, leaf abscission, zone of abscission How did the leaf abscission experiment (coleus plant) work? . o What did the auxin capsule do? o What were the expected results? o How does this relate to/mimic leaves in autumn when leaves fall? .How did the apical dominance (mint plant) experiment work? o o o What did the auxin capsule do? What were the expected results? How does this relate to tree branching le. training your bonsai to get branches? What does auxin do in various parts of the plant that we discussed this lab? Review prelab and discussion questions . .Explanation / Answer
Hi Answer:
Q.What hormone is responsible for gravitropism and phototropism?
Answer: Auxin is the responsible hormone for Gravitropism as well as for the phototropism.
Q.Dicots vs monocots phototropic response: why do they look the way they do?
Answer: both plants show positive response towards the light and move or bend towards the light source. Example sunflower it moves towards the sun direction.
Q.How do gravitropism and phototropism affect plant growth in different parts of the plant?
Answer: In gravitropism, the plant growth toward the earth roots shows positive gravitropism whereas the leaves or shoots shows the positive phototropism.
Q.Plant in a box with light source: what happened?
Answer: It will bend towards the direction of the light source.
Q.What plant exhibits negative phototropism?
Answer: Growth away from light is called negative phototropism (or Skototropism). Some vine shoot tips exhibit negative phototropism
Q.Where doses auxin concentrates in the roots and shoots to induce bending:
Answer: Auxins are made in the tips of the shoots and roots of the plant, and can diffuse to other parts of the plant.
Terms:
Apical meristem: meristem is the tissue where most of the undifferentiated cells are present. The meristem present at the tip or apical region of a shoot and root is known as apical meristem.
Apical dominance: the condition in which the main stem of the plant is dominant over the side stems or branches is known as apical dominance.
Axillary buds: They are also known as lateral buds, these are the embryonic shoots located at the axial of the leaf and have the capacity to form shoots.
Leaf abscission: Abscission is the process of shedding down the leaf from the plant. Leaf abscission took place due to several physical and chemical changes which took place in abscission zone.
Zone of abscission: is the area which joins the leaf with the plant. It is not visualized by the naked eye and it looks the part of leaf but under the microscope, this zone is clearly visualized having specific cell layers. The various chemical and physical changes happened in this zone which causes the abscission of the leaf.
Q.What does auxin do in various parts of the plant that we discuss this lab?
Answers: Auxins responsible for the Gravitropism (roots) and phototropism (shoots) plants.
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