Life Sciences Grade 11
NSC
MDE/MAY 2024
SECTION A
QUESTION 1
1.1 Various options are provided as possible answers to the following questions.
Choose the correct answer and write only the letter (A TO D) next to the
question number (1.1.1 to 1.1.5) in your ANSWER BOOK, for example 1.1.AA
1.1.1 Energy is released during....
photosynthesis
A
B
cellular respiration
C
transpiration
D
digestion
1.1.2 Two products of cellular respiration are:
A
Water in urine and exhaled carbon dioxide.
B
Inhaled oxygen and exhaled carbon dioxide.
C
Inhaled oxygen and water in urine.
D
Exhaled carbon dioxide and glucose.
1.1.3 A common characteristic of both aerobic and anaerobic respiration is that...
Oxygen is used and carbon dioxide is released.
A
B
carbon dioxide is used and oxygen is released.
C
glucose is the source of energy.
D
they both occur in the mitochondria.
1.1.4 The source of atmospheric oxygen that is needed for cellular respiration by all
organisms is
decomposing organic matter.
A
B
photosynthesis
C
combustion reactions.
D
from the destruction of the cozone layer.

Cellular Respiration: Cellular respiration is a biological process that extracts energy from glucose molecules to produce ATP, which is used as an energy source for cellular activities.

Examples of Cellular Respiration:

Aerobic Respiration: Aerobic respiration occurs in the presence of oxygen and is more efficient, producing a larger amount of ATP. E.g., in humans.
Anaerobic Respiration: Anaerobic respiration occurs in the absence of oxygen and is less efficient, producing less ATP. E.g., in yeast during fermentation.

Energy Production: Both aerobic and anaerobic respiration involve the breakdown of glucose to release energy, regardless of whether oxygen is present or not.

Learn more about Cellular Respiration here:

https://brainly.com/question/41603984