ARMANI ASSIGNMENTS:0742267454
NST1502
ASSIGNMENT 2
QUESTION 1
1. Name a scientist’s first step in the scientific method.
ask good questions.
2. An example of an observation that a scientist might make.
When something is unusual or different from the norm
3. Scientists use their eyes to make observations.
4. A hypothesis must be testable and it predicts an outcome.
, ARMANI ASSIGNMENTS:0742267454
QUESTION 2
a) Matter is any physical substances that occupies space and has mass.
b) Element is a substance that cannot be broken down into simpler substances.
c) Atom is a basic building block of matter.
d) Protons are particles with a positive electrical charge.
e) Molecules is a group of two or more atoms held together by attractive forces.
f) Atomic number is the number of protons that an atom has.
g) Periodic table is a table of the chemical elements arranged in order of atomic
number usually in rows so that elements with similar chemical structure appear in
vertical columns.
h) Chemical bond is a lasting attraction between atoms or ions that enables the
formation of molecules and crystals.
i) Hydrogen bond is a partially electrostatic attraction between a hydrogen bond
which is bound to a more electro negative atom such a nitrogen.
j) Compound bond are atoms of more than one element combined together in a
constant whole number ratio.
k) Ionic bond is formed by passing an electron from one atom to another.
QUESTION 3
3.1
PLANT CELL ANIMAL CELL
Plant cells are larger in size than animal Animal cells are smaller in size.
cells
Plant cells have a cell wall. Animal cells do not have a cell wall.
Vacuoles in plants are large. Vacuoles in animals’ cells are either small
or not present.
Plastids are present Plastids are absent
Plant cells have chloroplasts Animal cells do not have chloroplasts.
Nucleus lies on one side Nucleus is present at the centre
3.2 Nucleus is an organelle that the DNA of a cell and is the control center of the cell.
Mitochondrion is the organelle that breaks down molecules to make ATP.
Vacuole is the organelle that stores water and other materials.
Chloroplast is the organelle that uses energy from the sunlight to make food.
3.3. Endocytosis is the process of capturing a substance or particle from outside the cell
by engulfing it with the cell membrane and bringing it into the cell. Exocytosis describes
the process of vesicles fusing with the plasma membrane and releasing their contents
to the outside of the cell.
3.4. Simple diffusion vs Facilitated diffusion
NST1502
ASSIGNMENT 2
QUESTION 1
1. Name a scientist’s first step in the scientific method.
ask good questions.
2. An example of an observation that a scientist might make.
When something is unusual or different from the norm
3. Scientists use their eyes to make observations.
4. A hypothesis must be testable and it predicts an outcome.
, ARMANI ASSIGNMENTS:0742267454
QUESTION 2
a) Matter is any physical substances that occupies space and has mass.
b) Element is a substance that cannot be broken down into simpler substances.
c) Atom is a basic building block of matter.
d) Protons are particles with a positive electrical charge.
e) Molecules is a group of two or more atoms held together by attractive forces.
f) Atomic number is the number of protons that an atom has.
g) Periodic table is a table of the chemical elements arranged in order of atomic
number usually in rows so that elements with similar chemical structure appear in
vertical columns.
h) Chemical bond is a lasting attraction between atoms or ions that enables the
formation of molecules and crystals.
i) Hydrogen bond is a partially electrostatic attraction between a hydrogen bond
which is bound to a more electro negative atom such a nitrogen.
j) Compound bond are atoms of more than one element combined together in a
constant whole number ratio.
k) Ionic bond is formed by passing an electron from one atom to another.
QUESTION 3
3.1
PLANT CELL ANIMAL CELL
Plant cells are larger in size than animal Animal cells are smaller in size.
cells
Plant cells have a cell wall. Animal cells do not have a cell wall.
Vacuoles in plants are large. Vacuoles in animals’ cells are either small
or not present.
Plastids are present Plastids are absent
Plant cells have chloroplasts Animal cells do not have chloroplasts.
Nucleus lies on one side Nucleus is present at the centre
3.2 Nucleus is an organelle that the DNA of a cell and is the control center of the cell.
Mitochondrion is the organelle that breaks down molecules to make ATP.
Vacuole is the organelle that stores water and other materials.
Chloroplast is the organelle that uses energy from the sunlight to make food.
3.3. Endocytosis is the process of capturing a substance or particle from outside the cell
by engulfing it with the cell membrane and bringing it into the cell. Exocytosis describes
the process of vesicles fusing with the plasma membrane and releasing their contents
to the outside of the cell.
3.4. Simple diffusion vs Facilitated diffusion
