smc-3647-40-Sexual vs Asexual

BIOLOGY, M5 2024 HSC 21

A diagram of the different parts of a flower is shown.

Identify the structures where pollen and ovules are located. (2 marks)

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Complete the table to compare features of sexual and asexual reproduction. (3 marks)

\begin{array} {|l|c|}
\hline
\rule{0pt}{2.5ex} \text{Feature} \rule[-1ex]{0pt}{0pt} & \quad \quad \text{Sexual}\quad \quad \rule[-1ex]{0pt}{0pt} & \quad \quad \text{Asexual}\quad \quad\\
\hline
\rule{0pt}{2.5ex} \text{Genetic variability} \\
\text{(yes/no)} \rule[-1ex]{0pt}{0pt} \\
\hline
\rule{0pt}{2.5ex} \text{Number of parents } \\
\text{required} \rule[-1.5 ex]{0pt}{0pt}\\
\hline
\rule{0pt}{2.5ex} \text{Example of an organism }\\
\text{which uses this type of }& \text{}\\
\text{reproduction} \rule[-1ex]{0pt}{0pt}\\
\hline
\end{array}

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a. Pollen: anther

Ovule: ovary

\begin{array} {|l|c|}
\hline
\rule{0pt}{2.5ex} \text{Feature} \rule[-1ex]{0pt}{0pt} & \ \ \ \ \ \ \ \ \text{Sexual}\ \ \ \ \ \ \ \ \rule[-1ex]{0pt}{0pt} & \ \ \ \ \ \ \ \text{Asexual}\ \ \ \ \ \ \ \\
\hline
\rule{0pt}{2.5ex} \text{Genetic variability} \rule[-1ex]{0pt}{0pt} & \text{Yes} \rule[-1ex]{0pt}{0pt} & \text{No} \\
\rule{0pt}{2.5ex} \text{(yes/no)} \rule[-1ex]{0pt}{0pt} & \text{} \rule[-1ex]{0pt}{0pt} & \text{} \\
\hline
\rule{0pt}{2.5ex} \text{Number of parents } \rule[-1ex]{0pt}{0pt} & \text{2} \rule[-1ex]{0pt}{0pt} & \text{1} \\
\rule{0pt}{2.5ex} \text{required} \rule[-1ex]{0pt}{0pt} & \text{} \rule[-1ex]{0pt}{0pt} & \text{} \\
\hline
\rule{0pt}{2.5ex} \text{Example of an organism } \rule[-1ex]{0pt}{0pt} & \text{} \rule[-1ex]{0pt}{0pt} & \text{} \\
\rule{0pt}{2.5ex} \text{which uses this type of } \rule[-1ex]{0pt}{0pt} & \text{Humans} \rule[-1ex]{0pt}{0pt} & \text{Bacteria} \\
\rule{0pt}{2.5ex} \text{reproduction} \rule[-1ex]{0pt}{0pt} & \text{} \rule[-1ex]{0pt}{0pt} & \text{} \\
\hline
\end{array}

Show Worked Solution

a. Pollen: anther

Ovule: ovary

BIOLOGY, M5 2023 HSC 33

Mechanisms of reproduction for both humans and generalised fungi are shown in the diagrams.

Describe the similarities and differences of reproduction in humans and generalised fungi. (4 marks)

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Similarities

→ Both human and fungi reproduction use mitosis and meiosis.

→ Both human and fungi reproduction form zygotes with chromosomes from two different individuals.

Differences

→ Humans reproduce through sexual reproduction while fungi use asexual spores or sexual reproduction.

→ Humans produce egg and sperm cells which fuse to form a zygote, while fungi produce spores which germinate to produce mycelium which can be formed sexually or asexually.

Show Worked Solution

Similarities

→ Both human and fungi reproduction use mitosis and meiosis.

→ Both human and fungi reproduction form zygotes with chromosomes from two different individuals.

Differences

→ Humans reproduce through sexual reproduction while fungi use asexual spores or sexual reproduction.

→ Humans produce egg and sperm cells which fuse to form a zygote, while fungi produce spores which germinate to produce mycelium which can be formed sexually or asexually.

Mean mark 56%.

BIOLOGY, M5 EQ-Bank 1 MC

A strawberry plant will send out over the ground runners which will take root and grow a new plant as shown.

This method of growing a new plant is an example of

budding.
binary fission.
external fertilisation.
asexual reproduction.

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`D`

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→ Runners are plant stems which grow and take root to produce a new plant.

→ This does not involve the use of pollen or seeds (sexual reproduction) and the new strawberry plant will be genetically identical to the first.

`=>D`

BIOLOGY, M5 2019 HSC 27

Yeast is a single-celled fungus that can reproduce by budding.

What type of reproduction is budding? (1 mark)

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Outline a procedure that could be used to test the effect of temperature on reproduction in yeast. (4 marks)

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a. Asexual.

b. Steps of procedure:

Prepare 4 water baths of 20, 30, 40 and 50 degrees Celsius.
Add 10mL of yeast suspension in 12 different test tubes.
Place 3 test tubes into each of the 4 water baths.
Incubate for 3 hours.
Take a drop from each test tube and inspect under a microscope using a mm grid and recording yeast counts for each.
Compare the number of cells present at each temperature to see which temperature is most optimal for yeast reproduction.

Show Worked Solution

a. Asexual.

b. Steps of procedure:

Prepare 4 water baths of 20, 30, 40 and 50 degrees Celsius.
Add 10mL of yeast suspension in 12 different test tubes.
Place 3 test tubes into each of the 4 water baths.
Incubate for 3 hours.
Take a drop from each test tube and inspect under a microscope using a mm grid and recording yeast counts for each.
Compare the number of cells present at each temperature to see which temperature is most optimal for yeast reproduction.

♦♦ Mean mark (b) 45%.

BIOLOGY, M5 2021 HSC 2 MC

Which of the following photographs shows an example of sexual reproduction?

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`D`

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By Elimination

→ Budding in fungi, binary fission in bacteria and runners in plants are all examples of asexual reproduction (Eliminate A, B and C).

→ Frog spawning requires a female to lay eggs and a male frog to fertilise them with sperm.

`=>D`