Basic questions Flashcards

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1
Q

Why is staining used

A

To give more contrast between cell structures
Makes them easier to see

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2
Q

What is plant tissue stained with

A

Iodine

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3
Q

Animal tissue stained

A

Methylene blue

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4
Q

Why do chromosomes need to be stained

A

Because they are transparent

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5
Q

What is p=0.05

A

There is a 5% chance that the null hypothesis is true

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6
Q

Why is chi square used

A

To compare observed and expected results
Discontinuous data

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7
Q

Why is T test used

A

To compare two sets of continuous data

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8
Q

What is abiotic

A

Non living factors

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9
Q

What is biotic

A

Living factors

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10
Q

What are examples of biotic factors

A

Diseases
Predation
Competition

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11
Q

Examples of abiotic factors

A

Temp
Light intensity
Humidity
Wind speed
Nutrient supply
Water supply

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12
Q

What is hazard and risk of methylene blue

A

It’s an irritant
Could splash on skin when pouring

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13
Q

Hazard and risk of hot water

A

Can burn skin when pouring
Handle carefully

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14
Q

What must you say when talking about risk

A

When doing ….injury may occur

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15
Q

Why were they taken from single parent plant and grown under same conditions

A

Minimise genetic variation
Ensure only light is having an effect

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16
Q

Environmental factors that should be controlled whne growing plants for experiment

A

Soil temp
Air temp
Water availability
Minerals
Soil ph
Carbon dioxide

17
Q

Why structures seem to appear to be in different shape from structure

A

Cut in different planes

18
Q

Equipment for microscopy

A

Microscope
Eye piece graticule
Stage micrometer

19
Q

Why is electron microscope better

A

Higher magnification
Higher resolution

20
Q

Why can you not use electron microscopes to view live specimens

A

High energy electron beam would kill or damage the living cells

21
Q

Reducing biodiversity factors

A

Over fishing
Over hunting
Pollution
Climate change
Deforestation
Grazing
Forest fires
Invasive alien species