Page 15 - Focus PT3 2020 Science ( BI Version )

Science PT3 Chapter 2 Cell as the Basic Unit of Life
Appreciating the Existence of Cellular Respiration and
Various Organisms 2.2 Photosynthesis

1. We should appreciate the existence of wide Respiration can be divided into two stages:
variety of organisms on Earth as a sign of
the glory of God. (a) External respiration or breathing
Form
Form
1 2. Various organisms live together, interact and (b) Internal respiration or cellular respiration
depend on one another for their survival.
External respiration (breathing) is the
3. Organisms also interact with the exchange of oxygen and carbon dioxide
environment to create a balanced between an organism and its environment.
ecosystem.
Cellular Respiration
Formative Practice 2.1 1. We require energy to carry out various
activities and living processes.
1. Arrange the steps in preparing a plant cell slide
in the correct sequence. 2. The energy is obtained from the food we
( ) The slide is observed under the take.
microscope.
( ) A thin epidermal layer is peeled off from 3. Our body cells are able to break down the
the onion. food to release energy stored in it. This is
( ) The specimen is covered with a cover called cellular respiration.
slip using a mounting needle.
( ) A drop of iodine solution is added to the
slide to stain the structures of the cell. Internal respiration (cellular respiration)
( ) The epidermal layer is placed on a slide is the oxidation and breakdown of glucose
in a drop of water. that occur in the living cells to release
energy.
2. Match the human cells to their functions.
Nerve cells ► ◄ Involved in reproduction
Sperm cells ► ◄ Allow body movement 4. Cellular respiration uses oxygen we breathe
Muscle cells► ◄ Transport oxygen in and glucose from the food to release
energy.
Red blood ► ◄ Receive and send nerve
cells impulses
5. Carbon dioxide and water are formed as
3. State three differences between animal cells by-products during cellular respiration.
and plant cells.
4. What is meant by unicellular organism and 6. Cellular respiration can be defined as the
multicellular organism? process that needs oxygen and glucose to
release energy, carbon dioxide and water.

C H O + 6O → 6CO + 6H O + 2898 kJ
6
2
2
2
12
6
HOTS Challenge 2 Glucose Oxygen Carbon Water Energy
Praktis Formatif 1
• Evaluating dioxide
Predict what would happen to the number of
white blood cells produced if we are attacked
by flu. State the inference for your prediction.

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