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Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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A) What do the results suggest about the part of the plant that regulates the thickness of developing leaves in response to light:

a) developing leaves

b) mature leaves

c) whole plant

B) Which treatment had leaves with the lowest surface area to volume ratios at a leaf size of 20mm:

a) high apex treatmetn

b) high whole treatment

c) low apex treatment

d) they all have same surface area to volume ratio

C) Which leaf will lose water more readily under dry conditions?

a) high apex

b) high whole

c) low apex

d) they will all lose water at the same rate

D) In what ways would the differences in leaf form evident between the High Whole and Low Whole treatments at the end of the experiment reflect adaptations to their different growth environments? Discuss specifically with respect to the effects of leaf form on photosynthetic rates and rates of water loss.

Scientists were interested in understanding how light affects leaf thickness.
They grew plants for one month in high light conditions. Then they
conducted the following treatments: (Low Apex: only apex was shaded),
(High Apex: only apex got high light), High Whole: whole plant received high
light, Low Whole: whole plant was shaded. The apex is topmost part of the
plant where new leaves develop. They then examined leaf thickness of new
leaves as a function of leaf length over 6 days of the treatment. The Low
Whole treatment did not have any leaves >20mm in length by day 6. They
found the following:
Leaf Thickness (um)
120
100
5
10
15
Leaf Length (mm)
20
treatment
High Apex
High Whole
Low Apex
Low Whole

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