9. (a) (i) Name the fungus, other than yeast, that you have studied as part of your course. (ii) Give one way the fungus you have named in part (i) differs from yeast. (b) Answer the following questions in relation to your investigation into the growth of leaf yeast using agar plates. (i) Mention two aseptic techniques you carried out to ensure a pathogen-free environment. (ii) What type of agar is recommended for optimal growth of yeast and other fungi? (iii) Describe how the plates were stored, from introduction of the yeast source until yeast growth was visible on the agar. (iv) How did you identify the leaf yeast growing on the agar? (v) Suggest a reason why few or no leaf yeasts may have grown on the agar.

Leaving Cert Biology EXPERIMENTS - ALL: 9. (a) (i) Name the fungus, othe

9. (a) (i) Name the fungus, other than yeast, that you have studied as part of your course - Leaving Cert Biology - Question 9 - 2018

Question 9

9. (a) (i) Name the fungus, other than yeast, that you have studied as part of your course. (ii) Give one way the fungus you have named in part (i) differs from y... show full transcript

Worked Solution & Example Answer:9. (a) (i) Name the fungus, other than yeast, that you have studied as part of your course - Leaving Cert Biology - Question 9 - 2018

Step 1

Name the fungus, other than yeast, that you have studied as part of your course.

96%

114 rated

Answer

Rhizopus

Step 2

Give one way the fungus you have named in part (i) differs from yeast.

99%

104 rated

Answer

Rhizopus is multicellular and has hyphae or mycelium or produces zygospores.

Step 3

Mention two aseptic techniques you carried out to ensure a pathogen-free environment.

96%

101 rated

Answer

Minimal opening of containers while working and thorough cleaning with disinfectant.
Sterilizing instruments and washing hands or using gloves to avoid contamination.

Step 4

What type of agar is recommended for optimal growth of yeast and other fungi?

98%

120 rated

Answer

Malt agar is recommended as it is a nutrient agar.

Step 5

Describe how the plates were stored, from introduction of the yeast source until yeast growth was visible on the agar.

97%

117 rated

Answer

The plates were stored right side up for the first 24 to 48 hours in an incubator at a temperature range of 15 to 30 °C for 2 to 7 days.

Step 6

How did you identify the leaf yeast growing on the agar?

97%

121 rated

Answer

The leaf yeast was identified by the pink color of the colonies that developed on the agar.

Step 7

Suggest a reason why few or no leaf yeasts may have grown on the agar.

96%

114 rated

Answer

Possible reasons include air pollution, time of year, recent rainfall, unsuitable temperature, wind, or damage during handling.

9. (a) (i) Name the fungus, other than yeast, that you have studied as part of your course - Leaving Cert Biology - Question 9 - 2018

Worked Solution & Example Answer:9. (a) (i) Name the fungus, other than yeast, that you have studied as part of your course - Leaving Cert Biology - Question 9 - 2018

Name the fungus, other than yeast, that you have studied as part of your course.

Give one way the fungus you have named in part (i) differs from yeast.

Mention two aseptic techniques you carried out to ensure a pathogen-free environment.

What type of agar is recommended for optimal growth of yeast and other fungi?

Describe how the plates were stored, from introduction of the yeast source until yeast growth was visible on the agar.

How did you identify the leaf yeast growing on the agar?

Suggest a reason why few or no leaf yeasts may have grown on the agar.

Join the Leaving Cert students using SimpleStudy...