Page 14 - Ranger PT3 2022 science

Science PT3 Chapter 2 Cell as the Basic Unit of Life
2. Table 2.3 shows the functions of plant cells.
Table 2.3 Functions of plant cells
Cells Function
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Palisade cells Contain chlorophyll to trap the light energy for photosynthesis

Guard cells Control the opening and closing of the stoma and reduce the loss
of water at night especially in hot weather
Epidermis cells Reduce the loss of water and enable the exchange of gases that
happens during photosynthesis Form 1

Root hair cell • Functions as the absorber of water and nutrients from the soil
Form 1
Cell wall • Has a fine form with many projections which provides a larger
Root surface area for absorption
hair Cell
membrane
Vacuole

Human Body Systems
1. There are 11 major systems in the human body.
2. Each system has a few organs which work together to carry out specific
functions.
3. All these systems must coordinate well so that we can live healthily.

Respiratory system Nose Skeletal system Skull
Supplies oxygen to the Trachea • Gives support and
body and expels carbon Lung protection to the internal
dioxide from the body organs
• Produces blood cells
Bone

Blood circulatory system Nervous system Brain
Transports oxygen Regulates the body’s
and nutrients to the Heart activities by sending Spinal cord
cells and removes information in the
carbon dioxide Blood form of impulses as Nerve
vessels
and soluble waste reactions to stimuli
products from cells

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