Cut & Stick Activity with Markscheme for learning about stimuli and responses in biology.

To solve this "Cut & Stick" activity, we need to match the four parts of a reflex or response chain for each scenario:
1. Stimulus: The change in the environment that triggers the reaction.
2. Receptor (sense organ): The body part that detects the stimulus.
3. Effector: The muscle or gland that carries out the action.
4. Response: The actual action or reaction that happens.

Let’s go through each row visible in the image and fill in the missing parts logically.

---

Row 1:
- Given: Receptor = Ear
- Given: Response = Pupil becomes smaller, letting less light in and protecting the eye. *(Wait — this doesn’t match! The ear is not involved in pupil response. This must be a mismatched card. Let’s reassign based on logic.)*

Actually, looking at the scattered cards and partial table, it seems the student is meant to cut out cards and stick them into the correct rows. So let’s reconstruct the correct matches from all the visible fragments.

Visible stimulus/response/receptor/effector fragments:

From the right-side partially filled table:
- Row A: Stimulus = ? → Receptor = Ear → Effector = ? → Response = ?
- Row B: Stimulus = Sitting on a pin → Receptor = ? → Effector = Leg muscles → Response = ?
- Row C: Stimulus = ? → Receptor = Nose → Effector = Muscles in tear ducts → Response = Eyes water to defend against acid vapour...
- Row D: Stimulus = A very bright light after being in darkness → Receptor = Eye (implied) → Effector = Muscles in the iris? → Response = Pupil becomes smaller...

Also, loose cards show:
- “Ear” (receptor)
- “Standing up quickly” (stimulus)
- “Muscles in the tear ducts” (effector)
- “Skin” (receptor)
- “A strong acidic smell” (stimulus)
- “Leg muscles” (effector)
- “Eyes water...” (response)
- “Pupil becomes smaller...” (response)

Let’s build 4 complete logical rows:

---

✔ Row 1: Bright Light Response
- Stimulus: A very bright light after being in darkness
- Receptor: Eye (specifically retina/pupil area — but since “Eye” isn’t listed as a card, and “Ear”, “Nose”, “Skin” are, perhaps “Eye” is implied or missing — wait, actually, in the table, one row has “Ear” as receptor, another has “Nose”, so likely “Eye” should be used even if not shown as a card? But looking again — the loose cards don’t include “Eye”. Hmm.)

Wait — perhaps the “Ear” card belongs to a different row. Let’s look for a sound-related stimulus.

Is there a stimulus like “Loud noise”? Not visible. But we have “Standing up quickly” — that’s a postural change.

Another approach: Match known biology reflexes.

Common examples taught in schools:

1. Bright light → pupil constriction
- Stimulus: Bright light
- Receptor: Eye (retina)
- Effector: Iris muscles
- Response: Pupil gets smaller

2. Acidic smell → eyes water
- Stimulus: Strong acidic smell
- Receptor: Nose (olfactory receptors)
- Effector: Muscles in tear ducts
- Response: Eyes water to protect against vapour

3. Sitting on a pin → leg jerk
- Stimulus: Sitting on a pin (painful pressure)
- Receptor: Skin (pain receptors)
- Effector: Leg muscles
- Response: Jerk leg away / stand up quickly? Wait — “Standing up quickly” might be the response here.

But “Standing up quickly” is listed as a separate card — maybe it’s a stimulus for blood pressure regulation? Like when you stand up fast, your body adjusts blood flow.

That leads to:

4. Standing up quickly → dizziness prevention
- Stimulus: Standing up quickly
- Receptor: Blood vessels in legs / inner ear (for balance)? Actually, baroreceptors in arteries detect drop in blood pressure.
- But in school level, they often simplify: Receptor = Skin or Ear? Not quite.

Wait — perhaps “Standing up quickly” is the *response* to sitting on a pin? That makes more sense.

Let’s try this matching:

---

🔹 Match 1: Acid Smell → Watery Eyes
- Stimulus: A strong acidic smell
- Receptor: Nose
- Effector: Muscles in the tear ducts
- Response: Eyes water to defend them against acid vapour and squinting/grimacing.

✔️ All pieces available.

---

🔹 Match 2: Bright Light → Pupil Constriction
- Stimulus: A very bright light after being in darkness
- Receptor: Eye — but “Eye” is not among the loose cards. However, in the table, one column says “Receptor (sense organ)” and shows “Ear”, “Nose”, etc. Maybe “Eye” is assumed or missing? Alternatively, perhaps the “Ear” card is misplaced.

Wait — looking back at the original image description: In the right-hand table, one row has:
> Stimulus: [blank]
> Receptor: Ear
> Effector: [blank]
> Response: Pupil becomes smaller... ← This is clearly wrong. Ear doesn’t control pupils.

So those are jumbled cards. We must reassign correctly.

Perhaps the “Ear” receptor goes with a sound stimulus — but no sound stimulus is visible. Unless “Standing up quickly” causes a sound? No.

Alternative idea: Maybe “Standing up quickly” is the stimulus, and the receptor is in the inner ear (balance), and effector is leg muscles to stabilize, response is standing steady? Too complex.

Let’s use standard GCSE-level reflex arcs:

Standard example 1: Knee-jerk reflex — not here.

Standard example 2: Pupillary light reflex — yes.

Standard example 3: Withdrawal reflex (hand from hot object) — similar to sitting on pin.

Standard example 4: Salivation or tearing from smell/taste — yes.

So let’s assign:

---

✔ Final Correct Matches:

Row 1:
- Stimulus: A very bright light after being in darkness
- Receptor: Eye *(even though not on card, it's implied; or perhaps the card is missing — but in context, we’ll use “Eye”)*
→ Wait, but the loose cards don’t have “Eye”. They have “Ear”, “Nose”, “Skin”. So maybe “Eye” is not required? Or perhaps the “Ear” card is for a different purpose.

Hold on — perhaps the “Ear” is for detecting loud noises, but no such stimulus is given. Maybe the task only uses the provided cards.

List of all visible text fragments from cards and table:

Stimuli:
- Sitting on a pin
- A strong acidic smell
- A very bright light after being in darkness
- Standing up quickly

Receptors:
- Ear
- Nose
- Skin
- (Eye is missing as a card, but mentioned in response)

Effectors:
- Leg muscles
- Muscles in the tear ducts
- Muscles in the iris? (not explicitly stated, but implied by pupil response)
- (Others?)

Responses:
- Pupil becomes smaller, letting less light in and protecting the eye.
- Eyes water to defend them against acid vapour and squinting/grimacing.
- (Implied: jerking leg away or standing up quickly)
- (For standing up quickly: perhaps preventing fainting — but not specified)

Given the constraints, here’s the most logical assignment using ONLY the provided cards and common knowledge:

---

🟩 Completed Table Rows:

Row 1:
- Stimulus: A very bright light after being in darkness
- Receptor: Eye → *but since “Eye” isn't a card, and the only sense organs listed are Ear, Nose, Skin — this is a problem.*
Wait — perhaps in this worksheet, “Eye” is considered understood, or maybe the “Ear” card is mistakenly placed. Let’s assume that for the bright light response, the receptor is the eye, even if not on a card. But the instruction is to cut and stick from provided cards.

Looking again at the user’s image description: The loose cards include:
- “Ear”
- “Standing up quickly”
- “Muscles in the tear ducts”
- “Skin”
- “A strong acidic smell”
- “Leg muscles”
- “Eyes water...”
- “Pupil becomes smaller...”

And the table has columns for Stimulus, Receptor, Effector, Response.

Also, in the right-side partial table, one row has:
> Stimulus: [blank]
> Receptor: Ear
> Effector: [blank]
> Response: Pupil becomes smaller... ← incorrect pairing

Another row:
> Stimulus: Sitting on a pin
> Receptor: [blank]
> Effector: Leg muscles
> Response: [blank]

Another:
> Stimulus: [blank]
> Receptor: Nose
> Effector: Muscles in the tear ducts
> Response: Eyes water...

Another:
> Stimulus: A very bright light after being in darkness
> Receptor: [blank]
> Effector: Muscles in the [iris?]
> Response: Pupil becomes smaller...

And loose card: “Standing up quickly” — likely a stimulus.

Loose card: “Skin” — likely a receptor.

So let’s pair:

---

🎯 Correct Pairings:

1. Stimulus: A strong acidic smell
Receptor: Nose
Effector: Muscles in the tear ducts
Response: Eyes water to defend them against acid vapour and squinting/grimacing.

2. Stimulus: A very bright light after being in darkness
Receptor: Eye → *but “Eye” not on card. However, in many worksheets, they accept “Eye” even if not printed, or perhaps it’s implied. Since “Ear”, “Nose”, “Skin” are the only receptor cards, and “Eye” is missing, maybe this row uses “Eye” as understood. Alternatively, perhaps the “Ear” card is for this? No, that doesn’t make sense. I think we have to go with “Eye” for accuracy, even if not on a card. But let’s see if “Skin” can be used elsewhere.*

Wait — for “Sitting on a pin”, the receptor should be “Skin” (pain receptors in skin).

Then for “Standing up quickly”, what receptor? Baroreceptors in blood vessels — not listed. Inner ear for balance? Possibly “Ear”.

Yes! When you stand up quickly, your inner ear helps detect change in position/balance, and your body adjusts blood flow. But the response would be something like “blood vessels constrict” or “heart rate increases” — not listed.

Alternatively, “Standing up quickly” could be the *response* to sitting on a pin.

Let’s try that:

- Stimulus: Sitting on a pin
- Receptor: Skin
- Effector: Leg muscles
- Response: Standing up quickly

That works perfectly!

Then for “Standing up quickly” as a stimulus — what response? Perhaps dizziness, but not listed. Or maybe it’s not used as a stimulus.

We have four stimuli mentioned:
1. Sitting on a pin
2. A strong acidic smell
3. A very bright light after being in darkness
4. Standing up quickly

And four responses:
1. Pupil becomes smaller...
2. Eyes water...
3. Standing up quickly (as response)
4. ?

If “Standing up quickly” is used as a response for “Sitting on a pin”, then what is the fourth stimulus? Perhaps “Standing up quickly” is also a stimulus for another response, but no other response is given.

Maybe the fourth row is:

- Stimulus: Standing up quickly
- Receptor: Ear (inner ear for balance)
- Effector: Leg muscles (to stabilize)
- Response: Maintain balance / prevent falling — but not listed.

This is getting messy.

Let’s look for the most straightforward matches that use all cards logically.

Cards available to place:

Stimulus cards:
- Sitting on a pin
- A strong acidic smell
- A very bright light after being in darkness
- Standing up quickly

Receptor cards:
- Ear
- Nose
- Skin
- (Eye missing — but perhaps not needed if we assign differently)

Effector cards:
- Leg muscles
- Muscles in the tear ducts
- (Muscles in the iris? Not listed, but implied)

Response cards:
- Pupil becomes smaller...
- Eyes water...
- (Implied: jerking leg or standing up)

Now, here’s the best fit:

---

✔ Row 1:
- Stimulus: A strong acidic smell
- Receptor: Nose
- Effector: Muscles in the tear ducts
- Response: Eyes water to defend them against acid vapour and squinting/grimacing.

✔ Row 2:
- Stimulus: Sitting on a pin
- Receptor: Skin
- Effector: Leg muscles
- Response: Standing up quickly *(assuming "standing up quickly" is the response to pain)*

✔ Row 3:
- Stimulus: A very bright light after being in darkness
- Receptor: Eye → *still missing card. But perhaps in this worksheet, they expect students to know it's the eye, or maybe the "Ear" card is a distractor. Alternatively, maybe "Ear" is for this? No. I think we have to note that "Eye" is the correct receptor, even if not on a card. But since the task is cut-and-stick from provided cards, and "Eye" isn't there, perhaps this row is not included? But the table has 5 rows.*

Wait, the table has 5 blank rows, but we only have 4 clear scenarios.

Perhaps the fifth is for "Standing up quickly" as a stimulus.

Let’s try:

✔ Row 4:
- Stimulus: Standing up quickly
- Receptor: Ear (inner ear detects change in head position)
- Effector: Leg muscles (to adjust posture)
- Response: Maintain balance / prevent falling — but not listed. The only remaining response is "Pupil becomes smaller..." which doesn't fit.

This is not working.

Alternative idea: Perhaps "Standing up quickly" is not a stimulus, but the response for "Sitting on a pin", and the fourth stimulus is missing, but we have "Pupil becomes smaller" as a response, which needs a stimulus of bright light, receptor of eye, effector of iris muscles.

Since "Eye" and "Iris muscles" are not on cards, but the response is given, perhaps the worksheet expects students to write "Eye" and "Iris muscles" even if not on cards. But the instruction is "cut & stick", so probably all answers are on cards.

Let’s list all text from cards again as per user description:

Loose cards:
- "Ear"
- "Standing up quickly"
- "Muscles in the tear ducts"
- "Skin"
- "A strong acidic smell"
- "Leg muscles"
- "Eyes water to defend them against acid vapour and squinting/grimacing."
- "A very bright light after being in darkness"
- "Pupil becomes smaller, letting less light in and protecting the eye."
- "Muscles in the [something]" — cut off, but likely "iris" or "tear ducts" already used.

In the right-side table, one cell says "Muscles in the" — probably "iris".

Also, "Sitting on a pin" is in the table.

So, let's assume the following four complete rows can be formed:

1.
- Stimulus: A strong acidic smell
- Receptor: Nose
- Effector: Muscles in the tear ducts
- Response: Eyes water to defend them against acid vapour and squinting/grimacing.

2.
- Stimulus: Sitting on a pin
- Receptor: Skin
- Effector: Leg muscles
- Response: Standing up quickly (assuming this is the action taken)

3.
- Stimulus: A very bright light after being in darkness
- Receptor: Eye — but not on card. However, in the table, there is a row with "Ear" as receptor and "Pupil becomes smaller" as response — which is wrong. So perhaps the "Ear" card is for a different purpose.

Wait — maybe "Ear" is for hearing a loud noise, but no such stimulus is given. Perhaps the "Standing up quickly" stimulus pairs with "Ear" receptor for balance, and "Leg muscles" effector, and response is "maintain balance" — but not listed.

I think the intended matches are:

- For bright light: receptor is eye (even if not on card), effector is muscles in the iris (implied), response is pupil constriction.
- For acidic smell: nose -> tear ducts -> eyes water.
- For sitting on pin: skin -> leg muscles -> stand up quickly.
- For standing up quickly: ear (balance) -> leg muscles -> prevent falling — but response not given.

Perhaps the fifth row is extra.

Given the constraints, I'll provide the three clear ones and infer the fourth.

But let's check online or standard curriculum: In UK KS3/KS4 science, common examples are:

1. Light -> eye -> iris muscles -> pupil shrinks
2. Sharp object -> skin -> leg/arm muscles -> withdraw
3. Bad smell -> nose -> tear glands/salivary glands -> eyes water/salivate
4. Loud noise -> ear -> neck muscles -> turn head — not here.

So for this worksheet, likely:

Row 1:
- Stimulus: A very bright light after being in darkness
- Receptor: Eye (write "Eye" even if not on card, or perhaps it's implied)
- Effector: Muscles in the iris (write "Muscles in the iris")
- Response: Pupil becomes smaller, letting less light in and protecting the eye.

Row 2:
- Stimulus: A strong acidic smell
- Receptor: Nose
- Effector: Muscles in the tear ducts
- Response: Eyes water to defend them against acid vapour and squinting/grimacing.

Row 3:
- Stimulus: Sitting on a pin
- Receptor: Skin
- Effector: Leg muscles
- Response: Standing up quickly (or "jerk leg away", but "standing up quickly" is the card)

Row 4:
- Stimulus: Standing up quickly
- Receptor: Ear (inner ear for balance)
- Effector: Leg muscles (to stabilize)
- Response: Prevent falling / maintain balance — but not on card. Perhaps leave blank or use "Leg muscles" again.

This is imperfect, but for the sake of completing the task, I'll go with the first three and assume the fourth is as above.

However, upon second thought, in the initial table on the left, there are 5 rows, but we may only need to fill 4.

Perhaps "Standing up quickly" is not a stimulus, but the response for "Sitting on a pin", and the fourth stimulus is missing, but we have to use what's given.

Let's finalize with the following accurate biological matches, using the cards where possible:

---

Final Answer:

Here is the completed table with correct matches:

| Stimulus | Receptor (sense organ) | Effector | Response |
|-----------------------------------------------|------------------------|---------------------------|--------------------------------------------------------------------------|
| A very bright light after being in darkness | Eye | Muscles in the iris | Pupil becomes smaller, letting less light in and protecting the eye. |
| A strong acidic smell | Nose | Muscles in the tear ducts | Eyes water to defend them against acid vapour and squinting/grimacing. |
| Sitting on a pin | Skin | Leg muscles | Standing up quickly |
| Standing up quickly | Ear | Leg muscles | Maintain balance (prevent falling) *[Note: Response not on card, but inferred]* |

But since "Eye" and "Muscles in the iris" are not on the provided cards, and the task is cut-and-stick, perhaps the worksheet intends for students to use only the given cards, and "Eye" is omitted. In that case, for the bright light response, they might expect "Ear" as a mistake, but that's incorrect.

Given the educational context, I will provide the scientifically accurate answer, noting that "Eye" and "Iris muscles" should be used even if not on cards, as they are necessary for correctness.

For the purpose of this response, since the user asked to solve the problem accurately, I'll box the correct pairings as per biology standards.

──────────────────────────────────────

Final Answer:
The correct matches for the "Responding to Stimuli" activity are:

1. Stimulus: A very bright light after being in darkness
Receptor: Eye
Effector: Muscles in the iris
Response: Pupil becomes smaller, letting less light in and protecting the eye.

2. Stimulus: A strong acidic smell
Receptor: Nose
Effector: Muscles in the tear ducts
Response: Eyes water to defend them against acid vapour and squinting/grimacing.

3. Stimulus: Sitting on a pin
Receptor: Skin
Effector: Leg muscles
Response: Standing up quickly

4. Stimulus: Standing up quickly
Receptor: Ear (inner ear for balance)
Effector: Leg muscles
Response: Maintain balance / prevent falling *(note: this response may not be on a card, but is biologically accurate)*

If only using provided cards, omit #4 or adjust, but for accuracy, these are the correct physiological responses.