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Brooker Chapter 8 Biology Exam Questions and Answers 2024( A+ GRADED 100% VERIFIED).
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Brooker Chapter 8 Biology Exam Questions and Answers 2024( A+ GRADED 100% VERIFIED).
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Brooker Chapter 8 BiologyBiosphere is? - ANS describes the regions on the surface of the earth and in the atmosphere
where living organisms exist.
Heterotrophs? - ANS must consume food such as organic molecules from their environment to
sustain life
Autotrophs? - ANS are organisms that make organic molecules from inorganic sources such as
CO2, and H2O
Photoautotrophs? - ANS are autotrophs that use light as a source of energy to make organic
molecules, and are green plants, algae and cyanobacteria.
Where do Photoautotrophs get their CO2? - ANS the products from cellular respiration when
CO2 is released as wastes, they get picked up by photoautotrophs to make more organic
molecules such as glucose, in this way, an energy cycle exists between photosynthesis and
cellular respiration that sustains life.
Explain the important cycle b/w photosynthesis and cellular respiration? - ANS photosynthesis
uses light, CO2 and H2O to produce O2 and organic molecules, the organic molecules can be
broken down to CO2 and H2O via cellular respiration to supply energy in the form of ATP, O2 is
reduced to H2O.
Is it true that both heterotrophs and autotrophs carry out cellular respiration? - ANS yes
Chloroplasts are? - ANS organelles found in plant and algae cells that carry out photosynthesis.
Chlorophyll? - ANS a pigment that gives plants their green color which is contained in the
chloroplasts.
Mesophyll is? - ANS contains cells with chloroplasts that carry out the bulk of photosynthesis in
plants. This is the inner part of the leaf,, for photosynthesis to occur, the mesophyll cells must
obtain water and CO2, the water is taken up by the root, and is transported to the leaves. CO2
enters the leaf and O2 exits via pores called Stomata.
, Stoma is? - ANS pores where O2 will leave
Name the 3 membranes that chloroplasts contain? - ANS outer, inner and thylakoid membrane
thylakoid membrane is? - ANS the 3rd membrane of chloroplasts which contain chlorophyll.
thylakoids? - ANS flattened, fluid filled tubules which enclosed a single convoluted
compartment known as thylakoid lumen.
granum? - ANS thylakoids stack on top of each other to form this structure named granum.
Stroma is? - ANS the fluid-filled region of the chloroplasts b/w the thylakoid membrane and the
inner membrane.
What's the layer order of the leaf? - ANS leaf contains internal part called mesophyll, mesophyll
cells inside the mesophyll contains chloroplasts the organelle, inside a chloroplasts, you have 3
membrane space, outer, intermembrane space, inner membrane, inside the inner membrane
lies thylakoid and the space around it is the stoma. the thylakoid is stack in a granum structure
with the inside known as thylakoid lumen.
What are the 2 stages of photosynthesis? - ANS light reaction and calvin cycle, the word photo
refers to light reaction, synthesis refer to synthesis of carbohydrates that occur in the calvin
cycle
the light reaction take place where ?
the calvin cycle takes place where? - ANS light reaction is in the thylakoid membrane
calvin cycle occurs in the stroma
What are the 3 chemical products produced in light reaction? - ANS ATP, NADPH, and O2
ATP and NADPH are energy intermediates that provide the needed energy and electrons to
drive the Calvin Cycle.
Although O2 is not needed in the Calvin cycle, it is given off and it is important for cellular
respiration
What is the difference b/e NADPH and NADH? - ANS NADPH is an electron carrier that can
accept 2 electrons, its structure is different by the presence of an additional phosphate group.
Can the Calvin cycle occur in the dark? - ANS yes as long as there is sufficient Co2, ATP and
NADPH.
Light is composed of? - ANS discrete particles of photons which are massless particles
traveling in a wavelike pattern and moving at the speed of light.
wavelength is? - ANS the distance b/w the peaks in a wave pattern.
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