Here are the answers to the biology worksheet questions.
Step-by-Step Reasoning:
1.
Question 1: Label the diagram.
* The diagram shows a blood smear under a microscope.
*
Top Left Box: Points to the small, irregular purple spots. These are
Platelets. They help clot blood.
*
Bottom Left Box: Points to the most numerous cells (the dark circles). These are
Red Blood Cells. They carry oxygen.
*
Right Top Box: Points to the large cell with a nucleus (the ring shape in the middle). This is a
White Blood Cell. It fights infection.
*
Right Bottom Box: Points to the empty space/background fluid. This is
Plasma. It carries substances.
2.
Question 2: Red blood cell shape.
* The question asks why they are disk-shaped and how it helps them.
* *Shape:* They are biconcave disks (thinner in the middle).
* *Reason/Usefulness:* This shape gives them a large surface area relative to their size. A larger surface area allows oxygen to enter or leave the cell more quickly. Also, the flexible shape lets them squeeze through tiny capillaries.
3.
Question 3: Match statements to components.
*
a) Carries oxygen around the body: This is the main job of
Red Blood Cells.
*
b) Needed to fight infections: This is the job of
White Blood Cells.
*
c) Packed full of haemoglobin: Haemoglobin binds to oxygen; it is found in
Red Blood Cells.
*
d) The largest cells in your blood: White blood cells are generally larger than red blood cells. So,
White Blood Cells.
*
e) A pale yellow liquid: This describes the fluid part of blood, which is
Plasma.
*
f) Carries dissolved substances around your body: Plasma transports nutrients, waste, and hormones. So,
Plasma.
*
g) Helps to form a clot when a blood vessel is damaged: This is the function of
Platelets.
Final Answer:
1. Diagram Labels
* Top Left:
Platelets
* Bottom Left:
Red Blood Cells
* Top Right:
White Blood Cells
* Bottom Right:
Plasma
2. Why do red blood cells have this shape?
They have a biconcave disk shape (like a donut without the hole). This shape is useful because it increases the surface area of the cell. A larger surface area allows oxygen to diffuse into and out of the cell much faster. Additionally, the thin shape makes them flexible so they can easily squeeze through narrow blood vessels called capillaries.
3. Component Names
* a:
Red Blood Cells
* b:
White Blood Cells
* c:
Red Blood Cells
* d:
White Blood Cells
* e:
Plasma
* f:
Plasma
* g:
Platelets
Parent Tip: Review the logic above to help your child master the concept of the blood worksheet.
