Question

20. The following statements compare the differences between the chlorophylla molecule at the center of a photosystem and chlorophyll elsewhere in the photosystem which statement is false? The excited electrons in chlorophyll that are not at the photosystem center return to their resting state, whereas the excited electrons in reaction center chlorophyll a are transferred to the primary electron acceptor Chlorophylla at the photosystem center has one more electron in its chemical structure than the chlorophy molecules have elsewhere in the photosystem. Chlorophyll outside of the photosystem center can transfer energy to any number of other molecules, whereas chlorophylla at the center of the photosystem center transfers its electron to only one other molecule. There are usually many more copies of chlorophyll that are not in the photosystem center than of chlorophylla in the photosystem center. Electrons in chlorophylla at the photosystem center are replaced by splitting water, whereas electrons in the other chlorophyll molecules do not need to be replaced. 21. All of the following statements regarding C4 plants are true except: rubisco is no longer necessary to make glucose they resemble CAM plants in that they keep their stomata closed during the day C4 plants grow better than c3 plants under low co, conditions. C4 plants may expand their ranges with global warming. they require more ATP to produce glucose than 3 plants.

Answer 1

20. Option C is correct
Photosystem = A group of pigments with associated proteins
They capture the light energy and mediate electron transport chain.
Each photosystem contains a reaction center which is comprised of chlorophyll A molecule surrounded by accessory pigments.

21. Option A is correct
C4 plants utilize a special strategy to reduce photorespiration.
They utilize PEP-carboxylase as the primary carboxylase.
They exhibit Kranz anatomy and chloroplast dimorphism.
They do utilize Rubisco to fix CO2 to glucose in the bundle sheath cells.