Bio 4C1 (4 Acrux)

What is biology?

Answer explanation

If your answer have the same meaning but marked wrong please inform me, I will check manually. Tq.

Which of the following is the correct match between the biological field and its definition?

• Virology

  Study of fungi

• Taxonomy

  Study of classification of animals and plants

• Mycology

  Study of internal structure of organisms.

• Ecology

  Study of interactions between living things and their environment.

Answer explanation

1. Virology is the study of viruses and viral diseases.

2. Taxonomy is the study of description, identification, classification and naming of animals and plants. (Include all underlined aspects)

3.Mycology is the study of fungi.

4. Anatomy is the study of internal structure of organisms.

Mr. Rahimi works as a dentist. Which of the following biological field is NOT studied by Mr. Rahimi?

• physiology

• botany

• microbiology

• neurology

Answer explanation

- Botany is the study of plant life.

- Physiology: Dentists have to study about salivation, dentinal sensory mechanisms, blood circulation in oral tissues, oral biomechanics, and the role of hormones in oral cavity.

- Neurology: Study of nervous systems.

- Microbiology: Dentists have to study about the microorganisms that cause oral infections.

Fume hood is used to protect the users from ________________

• breathing in chlorine and bromine gas.

• microbial infections.

• skin contact with strong acids.

Answer explanation

Textbook pg 6

State 2 examples of personal protective equipment in a lab and their functions.

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OFF

Answer explanation

Refer Textbook Pg 7

What should you do if your hand is exposed to acid?

• Run tap water to wash off the acid.

• Neutralise the acid with alkaline solution.

• Wash the hand with soap.

• Use oil to remove the acid.

Answer explanation

- Accidental excessive alkaline is corrosive to skin.

- Soap is ineffective in acidic solution as precipitates (soap scum) will be formed.

- Oil is not soluble in acid because they are two chemically different substances.

Explain the steps to manage the petri dishes after using it in a laboratory?

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OFF

Answer explanation

Study Textbook Pg 18

Petri dish is the waste from Category B (Non-sharp wastes)

Pack the petri dishes in an autoclave resistant biohazard plastic bag. Then, place the biohazard plastic bag in an autoclave at 15psi and 121°C for 20 minutes to sterilise the petri dishes. After that, the petri dishes are placed into a biohazard bin.

Explain the steps to handle the accident of breaking a thermometer.

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OFF

Answer explanation

Breaking thermometer causes mercury spills.

1. Inform the teacher.

2. Declare the spill area as a restricted zone.

3. Sprinkle sulfur to cover the mercury spills.

4. Call the fire and rescue department.

(Textbook Pg 9)

What is the variable represented by the y-axis in a line graph?

• Manipulated variable

• Fixed variable

• Responding Variable

Answer explanation

Refer Textbook Pg 11

Which of the following is/are the characteristics of a bar chart?

• The bar height depends on the frequency.

• The bars are attached to each other.

• The bars have uniform width.

• The x-axis represents the responding variable.

Answer explanation

Textbook Pg 12