Btec Applied Science Unit 1:B2 Biology
Questions And Answers With Verified
Solutions Latest Updated 2024
What does multicellular mean? - ANSWER✔✔Many organisms are multi-cellular,
meaning that they are made from billions of cells.
Why is it important that cells within these organisms become specialised? -
ANSWER✔✔It is important that cells within these organisms become specialised
for different roles with particular functions.
How are multi-cellular organisms organized? - ANSWER✔✔1-Specialised cells
2-Tissues
3-Organs
4- Organ systems
5- Organism
Where are palisade mesophyll cells found? And what is the shape of these cells? -
ANSWER✔✔Palisade mesophyll cells found in leaves are rectangular box-shaped
cells that contain chloroplasts.
What is the function of the chloroplast in the palisade mesophyll cell? -
ANSWER✔✔The chloroplasts are able to absorb a large amount of light for
photosynthesis.They also move around in the cytoplasm in order to maximise the
amount of light absorbed.
How are these palisade mesophyll cells structured? - ANSWER✔✔These cells are
closely packed together and form a
, continuous layer in the leaf.
What is the role of the plasma membrane/cell wall in the palisade mesophyll cell?
And what is the cell wall made of? - ANSWER✔✔Palisade cells are surrounded
by a plasma membrane and a cell wall made of cellulose. This helps to protect the
cell and keep it rigid.
How does a palisade mesophyll cell maintain its rigid structure? -
ANSWER✔✔The plasma membrane pushes against the cell wall of the plant to
maintain its rigid structure.
What is another sub- organelle involved in the palisade mesophyll cell and what is
its role? - ANSWER✔✔They also have a large vacuole to maintain turgor
pressure.
Where are root hair cells found? - ANSWER✔✔These cells are found at a plant's
roots, near the growing tip. They have long hair-like extensions called root hairs.
What is the function of the root hairs in a root hair cell? - ANSWER✔✔The root
hairs increase the surface area of the cell to maximise the movement of water and
minerals from the soil into the plant root.
What is another key characteristic of root hair cells? - ANSWER✔✔The cells have
thin cellulose walls and a vacuole containing cell sap with a low water potential.
This encourages the movement of water into the cell.
What are sperm cells? - ANSWER✔✔Sperm cells are male gametes in animals.
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