Plant Water Relations, Photosynthesis, and
Reproduction: Key Concepts for Biology
1401 Exam Questions and Answers with
Verified Solutions | Latest Updated 2026
Why do plants need water? To perform photosynthesis, maintain their
tissues,
cool their leaves through transpiration,
transport
nutrients, and support growth.
How does water move through By osmosis and through vascular tissues
plant due to
cells? differences in water potentials.
What is osmosis? The diffusion of water through
semipermeable
membranes from a region of higher
concentration
to a region of lower concentration.
What happens to plant cells in a Water molecules move into the cells,
hypotonic solution? making them
turgid.
What happens to plant cells in a Water molecules move out of the cells,
hypertonic solution? causing
them to become plasmolyzed.
, What is transpiration? The loss of water vapor from the leaf to the
atmosphere, driving water movement
through
xylem from soils to leaves.
How do guard cells regulate By changing turgor pressure to open or
transpiration? close
stomata.
What is the role of Rubisco in Rubisco combines CO2 with RuBP during
photosynthesis? the
carbon fixation stage of photosynthesis.
What are the light reactions in Reactions that occur in the thylakoid
photosynthesis? membranes,
producing ATP and NADPH while splitting
water
and releasing oxygen.
Where do the carbon reactions of In the stroma of chloroplasts.
photosynthesis occur?
What is the main product of the Glucose, formed from CO2 using ATP and
carbon reactions? NADPH.
What is photorespiration? A wasteful process where RuBisCO
catalyzes the
oxidation of O2 instead of fixing CO2,
breaking
down RuBP.
Reproduction: Key Concepts for Biology
1401 Exam Questions and Answers with
Verified Solutions | Latest Updated 2026
Why do plants need water? To perform photosynthesis, maintain their
tissues,
cool their leaves through transpiration,
transport
nutrients, and support growth.
How does water move through By osmosis and through vascular tissues
plant due to
cells? differences in water potentials.
What is osmosis? The diffusion of water through
semipermeable
membranes from a region of higher
concentration
to a region of lower concentration.
What happens to plant cells in a Water molecules move into the cells,
hypotonic solution? making them
turgid.
What happens to plant cells in a Water molecules move out of the cells,
hypertonic solution? causing
them to become plasmolyzed.
, What is transpiration? The loss of water vapor from the leaf to the
atmosphere, driving water movement
through
xylem from soils to leaves.
How do guard cells regulate By changing turgor pressure to open or
transpiration? close
stomata.
What is the role of Rubisco in Rubisco combines CO2 with RuBP during
photosynthesis? the
carbon fixation stage of photosynthesis.
What are the light reactions in Reactions that occur in the thylakoid
photosynthesis? membranes,
producing ATP and NADPH while splitting
water
and releasing oxygen.
Where do the carbon reactions of In the stroma of chloroplasts.
photosynthesis occur?
What is the main product of the Glucose, formed from CO2 using ATP and
carbon reactions? NADPH.
What is photorespiration? A wasteful process where RuBisCO
catalyzes the
oxidation of O2 instead of fixing CO2,
breaking
down RuBP.
