IGCSE Biology MCQ Quiz! Exam

2.

Osmosis is the diffusion of water molecules from a region of higher water potential to a region of lower water potential.

True
False

Correct Answer

A. False

Explanation

THROUGH A PARTIALLY PERMEABLE MEMBRANE!!

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3.

Which of the following structures are only found in a plant cell?

Nucleus
Chloroplast
Cell membrane
Cell wall
Cytoplasm
Permanent vacuole

Correct Answer(s)

A. Chloroplast
A. Cell wall
A. Permanent vacuole

Explanation

The structures that are only found in a plant cell are chloroplasts, cell walls, and permanent vacuoles. Chloroplasts are responsible for photosynthesis, converting sunlight into energy. Cell walls provide support and protection to the cell. Permanent vacuoles store water and nutrients. The nucleus, cell membrane, and cytoplasm are found in both plant and animal cells.

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4.

State the formula for calculating magnification:

Magnification = Image size x Actual size
Magnification = Actual size / Image size
Magnification = Image size / Actual size
Magnification = Image size - Actual size

Correct Answer

A. Magnification = Image size / Actual size

Explanation

The formula for calculating magnification is given by Magnification = Image size / Actual size. This formula represents the ratio of the size of the image produced by an optical system to the actual size of the object being observed. By dividing the image size by the actual size, we can determine the degree of magnification achieved.

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5.

Which of the following are simple sugars?

Glucose
Sucrose
Cellulose
Lactose
Galactose
Fructose
Starch
Glycogen

Correct Answer(s)

A. Glucose
A. Galactose
A. Fructose

Explanation

Glucose, galactose, and fructose are simple sugars because they consist of a single sugar molecule or monosaccharide. Sucrose, lactose, starch, and glycogen are complex sugars or polysaccharides because they are made up of multiple sugar molecules bonded together. Cellulose is also a complex sugar and a type of fiber found in plant cell walls.

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6.

Which of the following factors affect the rate of transpiration?

Temperature
PH
Humidity
Wind
Carbon dioxide concentration
Light intensity

Correct Answer(s)

A. Temperature
A. Humidity
A. Wind
A. Light intensity

Explanation

The rate of transpiration, which is the process of water movement through a plant and its evaporation from aerial parts, is affected by several factors. Temperature plays a significant role as it increases the rate of evaporation and therefore transpiration. Humidity affects transpiration by creating a concentration gradient between the leaf surface and the surrounding air. Higher humidity reduces the rate of transpiration. Wind can increase transpiration by removing the boundary layer of humid air around the leaf surface. Light intensity affects the opening and closing of stomata, which in turn affects transpiration. Therefore, all these factors - temperature, humidity, wind, and light intensity - have a direct impact on the rate of transpiration.

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7.

Which of the following factors affect the rate of diffusion?

Temperature
PH
Concentration
Particle size
Surface area
Distance
Concentration gradient

Correct Answer(s)

A. Temperature
A. Particle size
A. Surface area
A. Distance
A. Concentration gradient

Explanation

The rate of diffusion is affected by several factors. Temperature plays a significant role in diffusion as higher temperatures increase the kinetic energy of particles, leading to faster movement and therefore faster diffusion. Particle size affects diffusion because smaller particles have a larger surface area to volume ratio, allowing for quicker diffusion. Surface area also influences diffusion as a larger surface area provides more space for particles to diffuse. Concentration gradient is another factor as a larger difference in concentration between two areas leads to faster diffusion. Lastly, distance affects diffusion as shorter distances allow for quicker diffusion.

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IGCSE Biology MCQ Quiz! Exam

Which of the following blood vessels carry deoxygenated blood?

Quiz Preview

Osmosis is the diffusion of water molecules from a region of higher water potential to a region of lower water potential.

Which of the following structures are only found in a plant cell?

State the formula for calculating magnification:

Which of the following are simple sugars?

Which of the following factors affect the rate of transpiration?

Which of the following factors affect the rate of diffusion?