Response to stimuli_Yr13

• Biology
• Further Education (Key Stage 5)

What process involved atmospheric nitrogen being converted to ammonia?

1. nitrification
2. nitrogen fixation
3. ammonification
4. denitrification

Which of the following biological molecules does not rely on the nitrogen cycle?

1. cellulose
2. guanine
3. tRNA
4. keratin

Which of the following processes is aerobic?

1. Nitrogen fixation
2. Nitrification
3. Denitrification
4. Fermentation

Which part of an amino acid enters the nitrogen cycle when organisms die?

1. carboxylic acid
2. R group
3. amine group
4. sulphide group

Which trophic level absorbs phosphorous in the form of phosphate ions?

1. Producers
2. Primary consumers
3. Secondary consumers
4. Decomposers

What type of relationship do commensal organsism, root nodule bacteria and mycorrhizae take part in?

1. parasitic
2. predation
3. interdependent
4. mutualistic

What group of living organisms are essential to all nutrient cycles?

1. saprobionts
2. heterotrophs
3. algae
4. viruses

What process is aerobic and involves oxidation?

1. ammonification
2. nitrification
3. denitrification
4. nitrogen fixation

In what two places are nitrogen fixing bacteria found?

What type of digestion do saprobionts do?

What protein have root nodule bacteria evolved to produce?

Why is being able to produce haemoglobin a selective advantage for root nodule bacteria?

What is the source of phosphate ions entering the phosphorous cycle?

List any biological molecules that require phosphorous for their synthesis.

If the stimulus is a loud bang in a deer's environment then the response is...

If the stimulus for an amoeba is a glucose concentration gradient then the response will be..

If the stimulus is light only coming from the left then a plants response is to...

If the stimulus is a snakes blood temperature exceeds 37 degrees then the response is...

If the stimulus is that there is a sudden decrease in light intensity for an owl then the response is...

If the stimulus is that there is a sudden drop in moisture in a woodlouse's environment then the response is...

If the stimulus is that there is a toxic chemical in the environment of a paramecium then the response is...

If the stimulus is that there is a lack of moisture in the soil surrounding a plants roots then the response is...

GCSE/Everyday

The woodlouse will move towards moisture.

A plant would send its roots deeper into the soil to find more water.

A Level

The woodlouse would increase its movement in random directions till it found an environment with a higher level of moisture.

A plant would do more mitosis and cell division in the meristem tissue at the tips of the roots. This would result in elongation of the roots which would mean they would extend deeper into the soil and increase the chances of accessing more water.

New vocabulary

Taxes - a simple response whose direction is determined by the direction in which the stimulus lies. A taxes can be positive i.e. towards the stimulus or negative i.e. away from the stimulus.

• chemotaxis
• phototaxis
• magnetotaxis
• geotaxis
• Thigmotaxis

New vocabulary

Kineses (Kinesis sing.) - a form of response in which the organism does not move towards or away from the stimulus. In this response the speed and rate of changes in direction both increase.

New vocabulary

Tropism - is a growth of part of a plant in response to a directional stimulus. Again tropisms can be positive and towards a stimulus, or negative and away from a stimulus.

• phototropism
• geotropism or gravitropism
• hydrotropism
• thigmotropism

Task

• Choose an example of one of each of  the responses.
• Describe in detail that response.
• Provide suitable images to support your example
• Explain how the response increases the organisms chances of survival.

Some species of bacteria
move away from the waste
products they produce

The sperm cells of a moss
plant are attracted towards
a chemical produced by
the female reproductive
organ of another moss plant.

The young stems of
seedlings grow away
from gravity

Describe the term kineses

Describe the term tropism

Describe the term effector

Describe the term taxes

Which line shows
competitive
inhibition?

1. pink
2. yellow
3. green
4. none of these

Which of the following is first to form between the substrate and active site during induced fit?

1. ionic bonds
2. disulfide bridges
3. hydrophobic interactions
4. hydrogen bonds

What reaction is used to break bonds?

1. hydrolysis
2. lysis
3. digestion
4. condensation

What contains the anticodon

1. the amino acid
2. the mRNA
3. the tRNA
4. the rRNA

What does non-disjunction cause?

1. polyploidy
2. a gamete have one more ore one less chromosome
3. silent mutations
4. hybridisation

What does this graph show?

1. effect of pH on enzyme activity
2. Stabilising selection
3. Plant respiration and photosynthesis rates over a 24h period
4. Directional selection

What organism is this the gas
exchange system for?

1. fish
2. bird
3. starfish
4. insect

Get the best image of Felix tigris

Get the best image of a chiasmata

Get the best image of a key adaptation for a xerophyte

Congratulations!

You just finished your lesson on responses to stimuli

How did that go?

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