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1.1 State: The concentration of abscisic acid in mid-winter The difference in abscisic acid concentration from May to June The season in which new leaves will appear 1.2 Between which two months did the tree lose the most leaves? 1.3 Give a reason for your answer in QUESTION 1.1.2.

Biology

ScanSolve AI Answer

Answer

c

April and May\text{April and May}

Step-by-step solution

4 steps

Step 1: Analyze the graph for Question 1.1.1 (a).
Mid-winter falls in July according to the graph's "Winter" label. Locate July on the x-axis and read the corresponding abscisic acid concentration from the y-axis.

Part a· 1 step

The concentration of abscisic acid in mid-winter (July) is 5 µg⋅DW−1\boxed{\text{5 µg·DW}^{-1}}.

  1. Analyze the graph for Question 1.1.1 (b).

    Find the abscisic acid concentration for May and June, then calculate the difference.
    Concentration in May: 8 µg·DW⁻¹
    Concentration in June: 7 µg·DW⁻¹

Part b· 1 step

The difference in abscisic acid concentration from May to June is 8−7=1 µg⋅DW−18 - 7 = \boxed{\text{1 µg·DW}^{-1}}.

  1. Analyze the graph and introductory text for Question 1.1.1 (c).

    The introductory text states the tree loses leaves in autumn and goes into dormancy during winter. New leaves appear after dormancy.

Part c

April and May\text{April and May}

New leaves will appear in the Spring\boxed{\text{Spring}}.

  1. Analyze the graph and introductory text for Question 1.1.2.

    The tree loses leaves in autumn. Abscisic acid (ABA) promotes leaf shedding. Identify the period in autumn with the highest ABA concentration or the most significant increase.
    Autumn includes March, April, and May. The abscisic acid concentration peaks in May at 8 µg·DW⁻¹. The sharpest increase in concentration, leading to this peak, occurs between April and May.

    The tree lost the most leaves between April and May\boxed{\text{April and May}}.

  2. Provide a reason for the answer in Question 1.1.2.

    Abscisic acid is a plant hormone known to promote leaf abscission (shedding). The graph shows the highest concentration of abscisic acid between April and May, which is during the autumn season when the tree loses its leaves.

    The reason is that abscisic acid (ABA) promotes leaf abscission, and the graph shows the highest concentration of ABA between April and May, which is when the tree loses its leaves in autumn.

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