Biology Lesson

What enzyme fixes CO₂ in C₄ and CAM plants?

• ATP synthase

• rubisCO

• PEP carboxylase

• lactase

In a plant cell, where are ATP synthase complexes located?

• thylakoid membranes only

• inner mitochondrial membranes only

• thylakoid membrane and inner mitochondrial membranes

• thylakoid membrane and plasma membranes

Where do the enzymatic reactions of the Calvin cycle take place?

• stroma of the chloroplast

• thylakoid membranes

• matrix of the mitochondria

• thylakoid space

In C3 photosynthesis, the reactions that require ATP take place in

• the light reactions alone

• the calvin cycle only

• both the light reactions and the calvin cycle

• the citric acid cycle

CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they

• fix CO2 into organic acids during the night when temperatures are cooler.

• fix CO2 into by combining it with RuBP in the Calvin cycle.

• obtain CO2 through their roots during the day.

• fix CO2 into organic acids in the mesophyll cells, which do not rely on stomata.

Compared to C3 plants, C4 plants

• have higher rates of photorespiration.

• can continue to fix CO2 even at relatively low CO2 concentrations and high oxygen concentrations.

• do not use rubisco for carbon fixation.

• grow better under cool, moist conditions.

In mitochondria, the electron transport chain pumps protons from the matrix into the intermembrane space, whereas in chloroplasts, the electron transport chain pumps protons from

• matrix to stroma

• stroma to thylakoid space

• intermembrane space to stroma

• thylakoid space to stroma

Plants or plant like organisms that make their own food using energy from the sunlight -

• Heterotrophs

• autotrophs

• saprophytes

• chemotrophs

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

What colour of light is best absorbed by plants?

• Red and blue

• Green and Yellow

• Red and green

• Blue and green

• Only green

Tags

NGSS.HS-LS1-5

An organism that consumes other organisms for energy is:

• Autotroph

• Decomposer

• Heterotroph

• Fungi

Tags

NGSS.HS-LS2-5