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, ASSIGNMENTS 2020 Assignment 1
Question 1 - Multiple Choice
1. The three basic components of an atom are:
A) Protons, neutrons, and ions
B) Protons, neutrons, and electrons
C) Protons, neutrinos, and ions
D) Protium, deuterium, and tritium
2. An element is determined by the number of:
A) Atoms
B) Electrons
C) Neutrons
D) Protons
3. The nucleus of an atom consists of:
A) Electrons
B) Neutrons
C) Protons and neutrons
D) Protons, neutrons, and electrons
4. A single proton has what electrical charge?
A) No charge
B) Positive charge
C) Negative charge
D) Either a positive or negative charge
5. Which particles have approximately the same size and mass as each other?
A) Neutrons and electrons
B) Electrons and protons
C) Protons and neutrons
D) None - all are different in terms of size and mass
6. Which two particles would be attracted to each other?
A) Electrons and neutrons
B) Electrons and protons
C) Protons and neutrons
D) All particles are attracted to each other
7. The atomic number of an atom is:
A) The number of electrons
B) The number of neutrons
C) The number of protons
D) The number of protons plus the number of neutrons
,8. Changing the number of neutrons of an atom changes its:
A) Isotope
B) Element
C) Ion
D) Charge
9. When you change the number of electrons on an atom, you produce a different:
A) Isotope
B) Element
C) Ion
D) Atomic mass
10. According to atomic theory, electrons are usually found:
A) In the atomic nucleus
B) Outside the nucleus, yet very near it because they are attracted to protons
C) Outside the nucleus- most of an atom's volume is the electron cloud
D) Anywhere they want to be -no particular location is more likely than any other
11. What reactants are needed for cellular respiration:
A) Glucose and carbon dioxide
B) Glucose and oxygen
C) Carbon dioxide and oxygen
D) Oxygen and lactic acid
12. Which of the following is the correct sequence of events during cellular respiration?
A) Glycolysis → fermentation → Krebs cycle
B) Krebs cycle → Electron Transport → glycolysis
C) Glycolysis → Krebs cycle → Electron Transport
D) Electron Transport → Krebs cycle → glycolysis
13. What happens during the Krebs cycle?
A) H+ ions and oxygen form water.
B) Lactic acid is formed using fermentation.
C) A glucose molecule is broken down into 2 pyruvic acid molecules.
D) H+ ions build up on one side the mitochondrial membrane.
E) Pyruvic acid is broken down in a series of steps into CO2
14. What happens during glycolysis?
A) H+ ions and oxygen form water.
B) Lactic acid is formed using fermentation.
C) H+ ions build up on one side the mitochondrial membrane.
D) A glucose molecule is broken down into 2 pyruvic acid molecules.
E) Pyruvic acid is broken down in a series of steps into CO2
15. What substance produced by alcoholic fermentation makes bread rise?
A) Oxygen
B) Lactic acid
C) CO2
D) Water
E) Alcohol
, Question 2
2.1. Discuss the process of the scientific method and clarify what is meant by the science process
skills.
The process of the scientific method:
Firstly, you have to make an observation, meaning that you are interested in something that was
observed. Observation includes questions such as: what? / how many? Secondly, a hypothesis is
made, meaning guessing the outcome. Thirdly, the experiment has to take place where the
hypothesis is tested. Lastly a conclusion is made by looking at the results of the experiment.
Science process skills:
Science as the process is important for understanding the concept such conducting observations,
making classifications, measuring, predicting and hypothesizing and constructing knowledge.
Science process skills includes communicating, experimenting, predicting, inferring, sorting,
quantities, measuring and observing qualities.
2.2. An investigation was carried out to study the effect of light intensity on the opening and
closing of the stomata.
Apparatus X (shown in the diagram below) was used to measure the rate of water loss from
the leaves at several light intensities.
At each light intensity, the apparatus was left for 15 minutes before starting measurements.
The water loss was recorded in the dark and at four different light intensities.
The results of this investigation are shown in the table below.
Light intensity (kilolux) Loss of water (g/hour)
0 1
10 15
20 20
30 22
40 20
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