REPRODUCTION IN PLANTS FINAL EXAM GUIDE
2025
|MOST COMMON QUESTIONS WITH CORRECTLY
VERIFIED ANSWERS|ALREADY A+
GRADED|GUARANTEED PASS
provide examples of photoautotrophs - plants, multicellular algae, unicellular protists,
cyanobacteria and purple sulphur bacteria
which of the substrates of photosynthesis undergoes oxidation and which one undergoes
reduction - Water is oxidized in photosynthesis, which means it loses electrons, and
carbon dioxide is reduced, meaning it gains electrons
what are the two stages of photosynthesis and where in the chloroplast do they take place -
light reactions and the calvin cycle and they occur in the thylakoid and stroma
define wavelength in relation to light. how does the wavelength correlate with the amount of
energy contained in light - the distance between the crests of electromagnetic waves.
their range radiation is known as the electromagnetic spectrum and is known and visible light.
the amount of energy is inversely related to the wavelength of the light: the shorter the
wavelength, the greater the energy of each photon of that light. thus, a photon of violet light
packs nearly twice as much energy as a photon of red light
what are the three possible processes that light waves undergo when light shines on an object -
when light meets matter, it can be reflected, transmitted or absorbed
what determines the colour of an object? why are leaves often green? - if a pigment is
illuminated with white light, the colour we often see is the colour most reflected or transmitted
by the pigment. we see green when we look at a leaf because chlorophyll absorbs violet-blue
and red light while transmitting and reflecting green light.
what is the absorption spectrum of a substance - a graph plotting a pigments light
absorption vs wavelength
, what is the action spectrum of light - An action spectrum is a graph of the rate of a
physiological activity plotted against wavelength of light. It shows which wavelength of light is
most effectively used in a specific chemical reaction. Some reactants are able to use specific
wavelengths of light more effectively to complete their reactions.
which are the photosynthetic pigments? compare their hydrophobicity - Chlorophyll a:
This is the most abundant pigment in plants. Chlorophyll a absorbs light with wavelengths of
430nm(blue) and 662nm(red). It reflects green light strongly so it appears green to us. It
contains a hydrophobic (fat soluble) phytol chain that allow it to be embedded in a lipid
membrane.
Chlorophyll b: This molecule has a structure similar to that of chlorophyll a. It absorbs light of
453nm and 642 nm maximally. It is not as abundant as chlorophyll a, and probably evolved later.
It helps increase the range of light a plant can use for energy.
Carotenoids: This is a class of accessory pigments that occur in all photosynthetic organisms.
They are completely hydrophobic (fat soluble) and exist in lipid membranes. Carotenoids absorb
light maximally between 460 nm and 550 nm and appear red, orange, or yellow to us.
why are the absorption spectra of the photosynthetic pigments and the action spectrum of
photosynthesis different - The absorption spectrum indicates how much of each
wavelength chlorophyll will absorb, whereas the action spectrum can tell us which off those
wavelengths are most effective in photosynthesis
what atomic events take place when isolated chlorophyll molecules absorb a photon of light -
When light hits the chlorophyll molecule, it becomes excited. This energy passes through
other chlorophyll molecules, and into the reaction center of Photosystem II: this is the location
of the first stage of photosynthesis, and the electron transport chain.
Photosystems location, components, events that take place when they absorb light -
Photosystems are found in the thylakoid membranes of plants, algae and cyanobacteria.
They are located in the chloroplasts of plants and algae, and in the cytoplasmic membrane of
photosynthetic bacteria. The Photosystem captures light with antennae pigments such as
carotene, xanthophyll, Phaeophytin a, Phaeophytin b, chlorophyll a and chlorophyll b, which
funnels it light and gradually concentrates it down to a "reaction center." When photosystem II
absorbs light, electrons in the reaction-center chlorophyll are excited to a higher energy level
and are trapped by the primary electron acceptors. Photoexcited electrons travel through the
2025
|MOST COMMON QUESTIONS WITH CORRECTLY
VERIFIED ANSWERS|ALREADY A+
GRADED|GUARANTEED PASS
provide examples of photoautotrophs - plants, multicellular algae, unicellular protists,
cyanobacteria and purple sulphur bacteria
which of the substrates of photosynthesis undergoes oxidation and which one undergoes
reduction - Water is oxidized in photosynthesis, which means it loses electrons, and
carbon dioxide is reduced, meaning it gains electrons
what are the two stages of photosynthesis and where in the chloroplast do they take place -
light reactions and the calvin cycle and they occur in the thylakoid and stroma
define wavelength in relation to light. how does the wavelength correlate with the amount of
energy contained in light - the distance between the crests of electromagnetic waves.
their range radiation is known as the electromagnetic spectrum and is known and visible light.
the amount of energy is inversely related to the wavelength of the light: the shorter the
wavelength, the greater the energy of each photon of that light. thus, a photon of violet light
packs nearly twice as much energy as a photon of red light
what are the three possible processes that light waves undergo when light shines on an object -
when light meets matter, it can be reflected, transmitted or absorbed
what determines the colour of an object? why are leaves often green? - if a pigment is
illuminated with white light, the colour we often see is the colour most reflected or transmitted
by the pigment. we see green when we look at a leaf because chlorophyll absorbs violet-blue
and red light while transmitting and reflecting green light.
what is the absorption spectrum of a substance - a graph plotting a pigments light
absorption vs wavelength
, what is the action spectrum of light - An action spectrum is a graph of the rate of a
physiological activity plotted against wavelength of light. It shows which wavelength of light is
most effectively used in a specific chemical reaction. Some reactants are able to use specific
wavelengths of light more effectively to complete their reactions.
which are the photosynthetic pigments? compare their hydrophobicity - Chlorophyll a:
This is the most abundant pigment in plants. Chlorophyll a absorbs light with wavelengths of
430nm(blue) and 662nm(red). It reflects green light strongly so it appears green to us. It
contains a hydrophobic (fat soluble) phytol chain that allow it to be embedded in a lipid
membrane.
Chlorophyll b: This molecule has a structure similar to that of chlorophyll a. It absorbs light of
453nm and 642 nm maximally. It is not as abundant as chlorophyll a, and probably evolved later.
It helps increase the range of light a plant can use for energy.
Carotenoids: This is a class of accessory pigments that occur in all photosynthetic organisms.
They are completely hydrophobic (fat soluble) and exist in lipid membranes. Carotenoids absorb
light maximally between 460 nm and 550 nm and appear red, orange, or yellow to us.
why are the absorption spectra of the photosynthetic pigments and the action spectrum of
photosynthesis different - The absorption spectrum indicates how much of each
wavelength chlorophyll will absorb, whereas the action spectrum can tell us which off those
wavelengths are most effective in photosynthesis
what atomic events take place when isolated chlorophyll molecules absorb a photon of light -
When light hits the chlorophyll molecule, it becomes excited. This energy passes through
other chlorophyll molecules, and into the reaction center of Photosystem II: this is the location
of the first stage of photosynthesis, and the electron transport chain.
Photosystems location, components, events that take place when they absorb light -
Photosystems are found in the thylakoid membranes of plants, algae and cyanobacteria.
They are located in the chloroplasts of plants and algae, and in the cytoplasmic membrane of
photosynthetic bacteria. The Photosystem captures light with antennae pigments such as
carotene, xanthophyll, Phaeophytin a, Phaeophytin b, chlorophyll a and chlorophyll b, which
funnels it light and gradually concentrates it down to a "reaction center." When photosystem II
absorbs light, electrons in the reaction-center chlorophyll are excited to a higher energy level
and are trapped by the primary electron acceptors. Photoexcited electrons travel through the
