Home / iGCSE Biology (0610) 2.1 Cell structure iGCSE Style Questions Paper 1

iGCSE Biology (0610) 2.1 Cell structure iGCSE Style Questions Paper 1

IGCSE Biology (0610) Practice Questions Paper 1 - All Chapters

Question

A student makes a drawing of an animal.

The length of the animal in the drawing is $30 \text{ mm}$.

The actual length of the animal is $200 \text{ mm}$.

What is the magnification of the student’s drawing?

(A) $\times 0.15$
(B) $\times 6.67$
(C) $\times 15$
(D) $\times 6000$
▶️ Answer/Explanation
To find the magnification, we use the formula: $$\text{Magnification} = \frac{\text{Size of Image}}{\text{Actual Size of Object}}$$ In this case, the image size (drawing) is $30 \text{ mm}$ and the actual size is $200 \text{ mm}$. By substituting these values into the equation, we get: $$\text{Magnification} = \frac{30 \text{ mm}}{200 \text{ mm}} = 0.15$$ Since the drawing is smaller than the real animal, the magnification factor is less than $1$. This indicates that the drawing has been scaled down rather than enlarged.
✅ Answer: (A)

Question

The photomicrograph shows part of an animal cell.
What is the structure labelled \(X\)?
  • A chloroplast
  • B mitochondrion
  • C ribosome
  • D vacuole
▶️ Answer/Explanation
Detailed solution

The correct answer is B.

Identification:
The image displays a transmission electron micrograph (TEM) of an organelle with a distinct double membrane structure. The label \(X\) points to the inner membrane, which is folded inwards to form finger-like projections called cristae. This folded structure is the hallmark characteristic of a mitochondrion. The cristae serve to increase the surface area available for the electron transport chain and ATP synthesis during aerobic respiration.

Question

What is the formula for calculating the magnification of specimens?
A   actual size \(\div\) image size
B   actual size \(\times\) image size
C   image size \(-\) actual size
D   image size \(\div\) actual size
▶️ Answer/Explanation
Detailed solution

The correct answer is D.

Magnification is a measure of how much larger a specimen appears compared to its real size. The general formula for calculating magnification is:

$$ \text{Magnification} = \frac{\text{Image size}}{\text{Actual size}} $$

This can also be written as image size \(\div\) actual size.

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