BIOLOGY 102 EXAM 2 QUESTIONS AND
ANSWERS
What do plants need?
A) Sunlight
B) Water
C) Oxygen
D) Carbon Dioxide
E) A,B,and D
F) All of the above - Correct Answers -F) All of the above
Given what you have learned, what plant characteristic would you not expect to see in a
tropical rainforest?
A) Extensive branching of the stems
B) Large, broad leaves
C) Small leaves
D) Many leaves shaded by leaves above it - Correct Answers -C) Small leaves
How do think water moves from the roots to the leaves?
A) Cohesion
B) Adhesion
C) DiGerences in water potential
D) Transpiration
E) All of the above
F) I have no clue - Correct Answers -E) All of the above
Secretin modulates digestion by
A) acting as an enzyme in the duodenum.
B) triggering bile release into the intestine.
C) triggering bu^er release from the pancreas.
D) acting as an enzyme in the stomach.
E) triggering acid release in the stomach. - Correct Answers -C) triggering bu^er release
from the pancreas.
Which of the following is a disadvantage of a closed circulatory system compared with
an open circulatory system?
A. A closed circulatory system uses more energy.
B. Higher pressures in a closed circulatory system support increased size and more
activity.
, C. Closed vessels allow fluid to be directed to specific body regions.
D. Exchange of gas and nutrients is faster in a closed circulatory system. - Correct
Answers -A. A closed circulatory system uses more energy.
The fluid that moves around in the circulatory system of a typical insect is the _____.
A. intracellularfluid
B. hemolymph
C. bloodplasma
D. digestive juices
E. cytosol - Correct Answers -B. hemolymph
The value for Ψ in root tissue was found to be -0.15 MPa. If you take the root tissue and
place it in a 0.1 M solution of sucrose (Ψ = -0.23), net water flow would:
A) be from the tissue into the sucrose solution.
B) be from the sucrose solution into the tissue.
C) be in both directions and the concentrations would remain equal.
D) be impossible to determine from the values given here. - Correct Answers -A) be
from the tissue into the sucrose solution.
About ____% of a plant's water escapes through the stomata, although the stomata
account for just ____% of the external leaf surface.
A) 75; 10
B) 75; 1-2
C) 95; 10
D) 95; 1-2 - Correct Answers -D) 95; 1-2
Sugar maples are tapped for their sugar-rich sap in the early spring. This sap is
transported in ______ and is moving from the ______.
A) xylem, leaves
B) xylem, roots
C) phloem, leaves
D) phloem, roots - Correct Answers -D) phloem, roots
If a potato tuber sends sugar to the rest of the plant during spring but receives sugar
from the rest of the plant during summer, it moves from being _____.
A) A source to a sink
B) A sink to a source - Correct Answers -A) A source to a sink
The basis of the pull generated by transpiration in the xylem is ____.
A) positive root pressure from diGerences in solute potential between soil and root.
B) positive pressure generated by the shrinking in diameter of the trunk or stem.
C) negative pressure at the air-water interface in the leaf.
D) pressure created by proton pumping of stomatal guard cells.
E) adhesion of water molecules to xylem cell walls. - Correct Answers -C) negative
pressure at the air-water interface in the leaf.
ANSWERS
What do plants need?
A) Sunlight
B) Water
C) Oxygen
D) Carbon Dioxide
E) A,B,and D
F) All of the above - Correct Answers -F) All of the above
Given what you have learned, what plant characteristic would you not expect to see in a
tropical rainforest?
A) Extensive branching of the stems
B) Large, broad leaves
C) Small leaves
D) Many leaves shaded by leaves above it - Correct Answers -C) Small leaves
How do think water moves from the roots to the leaves?
A) Cohesion
B) Adhesion
C) DiGerences in water potential
D) Transpiration
E) All of the above
F) I have no clue - Correct Answers -E) All of the above
Secretin modulates digestion by
A) acting as an enzyme in the duodenum.
B) triggering bile release into the intestine.
C) triggering bu^er release from the pancreas.
D) acting as an enzyme in the stomach.
E) triggering acid release in the stomach. - Correct Answers -C) triggering bu^er release
from the pancreas.
Which of the following is a disadvantage of a closed circulatory system compared with
an open circulatory system?
A. A closed circulatory system uses more energy.
B. Higher pressures in a closed circulatory system support increased size and more
activity.
, C. Closed vessels allow fluid to be directed to specific body regions.
D. Exchange of gas and nutrients is faster in a closed circulatory system. - Correct
Answers -A. A closed circulatory system uses more energy.
The fluid that moves around in the circulatory system of a typical insect is the _____.
A. intracellularfluid
B. hemolymph
C. bloodplasma
D. digestive juices
E. cytosol - Correct Answers -B. hemolymph
The value for Ψ in root tissue was found to be -0.15 MPa. If you take the root tissue and
place it in a 0.1 M solution of sucrose (Ψ = -0.23), net water flow would:
A) be from the tissue into the sucrose solution.
B) be from the sucrose solution into the tissue.
C) be in both directions and the concentrations would remain equal.
D) be impossible to determine from the values given here. - Correct Answers -A) be
from the tissue into the sucrose solution.
About ____% of a plant's water escapes through the stomata, although the stomata
account for just ____% of the external leaf surface.
A) 75; 10
B) 75; 1-2
C) 95; 10
D) 95; 1-2 - Correct Answers -D) 95; 1-2
Sugar maples are tapped for their sugar-rich sap in the early spring. This sap is
transported in ______ and is moving from the ______.
A) xylem, leaves
B) xylem, roots
C) phloem, leaves
D) phloem, roots - Correct Answers -D) phloem, roots
If a potato tuber sends sugar to the rest of the plant during spring but receives sugar
from the rest of the plant during summer, it moves from being _____.
A) A source to a sink
B) A sink to a source - Correct Answers -A) A source to a sink
The basis of the pull generated by transpiration in the xylem is ____.
A) positive root pressure from diGerences in solute potential between soil and root.
B) positive pressure generated by the shrinking in diameter of the trunk or stem.
C) negative pressure at the air-water interface in the leaf.
D) pressure created by proton pumping of stomatal guard cells.
E) adhesion of water molecules to xylem cell walls. - Correct Answers -C) negative
pressure at the air-water interface in the leaf.
