BIOLOGY 1002 EXAM 4 2026 MOCK PAPER
COMPREHENSIVE REVIEW MATERIAL APLUS
◉ What is the likely effect of a mutation causing spongy parenchyma
to have the same structure as palisade parenchyma?
Answer: The plant will be less efficient at gas exchange due to
reduced diffusion of gases within the leaf.
◉ In an experiment where light reactions are blocked, how does the
rate of the Calvin Cycle compare between a plant kept in the dark
versus one kept in the light?
Answer: The rate will be the same in both plants because the Calvin
Cycle relies on the products of the light reactions (ATP and NADPH)
produced prior to the blockage.
◉ What does the absence of sperm in the distal reproductive ducts
despite normal spermatogenesis suggest?
Answer: Surgical interruption of the vas deferens preventing
transportation of sperm.
◉ What is the outcome if the second sperm cell fails to fuse with the
central cell in double fertilization?
Answer: A viable embryo forms, but endosperm development fails,
leading to aborted seed development.
, ◉ How does a mutation in the H+-ATPase pump that brings two
hydrogen ions into the root hair per ATP hydrolyzed affect the plant?
Answer: Phosphate uptake decreases due to reduced acidification of
the soil.
◉ Why does photosynthesis decline when leaves wilt?
Answer: Stomata close to limit further water loss, which restricts
CO2 entry into the leaf.
◉ How many ATP molecules are hydrolyzed in the Calvin cycle to
produce enough G3P for the synthesis of two glucose molecules?
Answer: 36 ATP molecules.
◉ How can tall trees survive in soil with extremely low levels of
nitrogen?
Answer: Plant-bacteria symbioses provide plants with ammonia
(NH3).
◉ How are light, CO2, water, and mineral ions classified in plant
biology?
Answer: Limiting factors.
COMPREHENSIVE REVIEW MATERIAL APLUS
◉ What is the likely effect of a mutation causing spongy parenchyma
to have the same structure as palisade parenchyma?
Answer: The plant will be less efficient at gas exchange due to
reduced diffusion of gases within the leaf.
◉ In an experiment where light reactions are blocked, how does the
rate of the Calvin Cycle compare between a plant kept in the dark
versus one kept in the light?
Answer: The rate will be the same in both plants because the Calvin
Cycle relies on the products of the light reactions (ATP and NADPH)
produced prior to the blockage.
◉ What does the absence of sperm in the distal reproductive ducts
despite normal spermatogenesis suggest?
Answer: Surgical interruption of the vas deferens preventing
transportation of sperm.
◉ What is the outcome if the second sperm cell fails to fuse with the
central cell in double fertilization?
Answer: A viable embryo forms, but endosperm development fails,
leading to aborted seed development.
, ◉ How does a mutation in the H+-ATPase pump that brings two
hydrogen ions into the root hair per ATP hydrolyzed affect the plant?
Answer: Phosphate uptake decreases due to reduced acidification of
the soil.
◉ Why does photosynthesis decline when leaves wilt?
Answer: Stomata close to limit further water loss, which restricts
CO2 entry into the leaf.
◉ How many ATP molecules are hydrolyzed in the Calvin cycle to
produce enough G3P for the synthesis of two glucose molecules?
Answer: 36 ATP molecules.
◉ How can tall trees survive in soil with extremely low levels of
nitrogen?
Answer: Plant-bacteria symbioses provide plants with ammonia
(NH3).
◉ How are light, CO2, water, and mineral ions classified in plant
biology?
Answer: Limiting factors.
