Fig. 2.1 is a photograph of a villus, from one part of the small intestine. Fig. 2.1 (i) The length of line $$$\mathbf{A B}$$$ represents the width of the villus in Fig. 2.1. Measure the length of line $$$\mathbf{A B}$$$. length of line $$$\mathbf{A B}$$$ ........................................ mm Use your measurement and the formula to calculate the actual width of the villus. $$\[ \text { magnification }=\frac{\text { length of line } \mathbf{A B} \text { in Fig. } 2.1}{\text { actual width of villus }} \]$$ Give your answer to two significant figures. Space for working. ..................................................... mm * 0000800000011 * (ii) Fig. 2.2 shows a villus from a different part of the small intestine. Fig. 2.2 State two ways the villus in Fig. 2.2 differs from the villus in Fig. 2.1. 1 .................................................................................................................................... ....................................................................................................................................... . 2 .................................................................................................................................... ....................................................................................................................................... .

Biology

IGCSE&ALevel

CAIE

Exam No：0610_w24_qp_63 Year：2024 Question No：2(a)

Answer:

Knowledge points:

2.1.1 Describe and compare the structure of a plant cell with an animal cell, as seen under a light microscope, limited to cell wall, nucleus, cytoplasm, chloroplasts, vacuoles and location of the cell membrane

2.1.10 State that cells with high rates of metabolism require large numbers of mitochondria to provide sufficient energy

2.1.2 State the functions of the structures seen under the light microscope in the plant cell and in the animal cell

2.1.3 State the functions of the structures seen under the light microscope in the plant cell and in the animal cell

2.1.4 State the functions of the structures seen under the light microscope in the plant cell and in the animal cell

2.1.5 State the functions of the structures seen under the light microscope in the plant cell and in the animal cell

2.1.6 State that the cytoplasm of all cells contains structures, limited to ribosomes on rough endoplasmic reticulum and vesicles

2.1.7 State that almost all cells, except prokaryotes, have mitochondria and rough endoplasmic reticulum

2.1.8 Identify mitochondria and rough endoplasmic reticulum in diagrams and images of cells

2.1.9 State that aerobic respiration occurs in mitochondria

2.3.1 Calculate magnification and size of biological specimens using millimetres as units

2.3.2 Calculate magnification and size of biological specimens using millimetres and micrometres as units

Answer:

Knowledge points:

Solution:

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