Science worksheet for students with questions on animals, plants, and properties of matter.
A science worksheet titled "Let's Talk Science" featuring questions about vertebrates, plant parts, and basic science concepts, with a diagram of a plant and a picture of a squirrel.
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Show Answer Key & Explanations
Step-by-step solution for: Science Grade 4 activity
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Show Answer Key & Explanations
Step-by-step solution for: Science Grade 4 activity
Here’s the complete solution to the “Let’s Talk Science” worksheet, with clear explanations for each answer.
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1. Vertebrates are animals with _a backbone (or spinal column)_.
✔ Explanation: Vertebrates are defined by having an internal skeleton with a backbone that protects the spinal cord. Examples: humans, birds, fish, reptiles.
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2. Mammals and _birds_ are warm blooded vertebrates.
✔ Explanation: Warm-blooded animals (endotherms) can regulate their own body temperature. Only mammals and birds are warm-blooded among vertebrates. Reptiles, amphibians, and fish are cold-blooded.
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3. I am cold blooded, breathe through lungs and have dry scaly skin: _I am a reptile._
✔ Explanation: Reptiles are cold-blooded, breathe air with lungs, and have dry, scaly skin. Snakes, lizards, turtles, and crocodiles are examples.
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4. I am a mammal but lay eggs. What am I? _A platypus (or echidna)._
✔ Explanation: Most mammals give birth to live young, but monotremes — like the platypus and echidna — are egg-laying mammals. They’re rare exceptions!
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5. I live in water and can breathe under water through gills. _I am a fish._
✔ Explanation: Fish are aquatic vertebrates that use gills to extract oxygen from water. They cannot survive long out of water.
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6–10. Label the parts of the plant using: Fruit, Leaf, Flower, Root, Stem
From top to bottom, left to right on the diagram:
- Top-left arrow → Flower (the yellow part at the top)
- Second arrow down on left → Leaf (green flat structures)
- Arrow pointing to red berry → Fruit (the ripe, edible part containing seeds)
- Arrow pointing to green stem → Stem (supports the plant and transports nutrients)
- Bottom arrow pointing to roots → Root (underground part that absorbs water and anchors the plant)
✔ So, labeled correctly:
> Top box (left): Flower
> Second box (left): Leaf
> Right box (top): Fruit
> Right box (bottom): Stem
> Bottom box (left): Root
*(Note: The arrows point to specific parts — match them as described above.)*
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11. To grow healthily plants need air, water, nutrients and _sunlight (or light)._
✔ Explanation: Plants make their own food via photosynthesis, which requires sunlight. Without it, they can’t grow properly.
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12. _Solids_ have a fixed shape but (13) _liquids_ take the shape of the container.
✔ Explanation: Solids keep their shape; liquids flow and take the shape of whatever container they’re in. Gases also take the shape of containers, but the question implies comparing solids and liquids.
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14. When a liquid is heated it _evaporates_ faster.
✔ Explanation: Heating increases the energy of liquid molecules, causing them to escape into the air as vapor — this is evaporation. Boiling is rapid evaporation.
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15. Water freezes at _0_ degrees Celsius.
✔ Explanation: This is a standard scientific fact. At 0°C, water changes from liquid to solid (ice).
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16. Salt _dissolves_ in water.
✔ Explanation: Salt (sodium chloride) is soluble in water — it breaks into ions and mixes evenly to form a solution.
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17. Stone is _insoluble_ in water.
✔ Explanation: Stone (like granite or limestone) does not dissolve in water — it may erode over time, but doesn’t form a solution.
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18. _Using a magnet_ is the best way to separate mixed buttons and paperclips.
✔ Explanation: Paperclips are usually made of steel (magnetic), while buttons are plastic or wood (non-magnetic). A magnet will attract only the paperclips.
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19. A _filter (or coffee filter)_ is ideal to separate coffee from water.
✔ Explanation: Filtration separates solids (coffee grounds) from liquids (brewed coffee) by passing the mixture through a porous material.
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20. A _magnet_ can be used to separate pins from buttons.
✔ Explanation: Pins are typically metal (magnetic), while buttons are not. A magnet will pick up the pins, leaving buttons behind.
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✔ Final Answer Summary:
1. a backbone
2. birds
3. reptile
4. platypus (or echidna)
5. fish
6–10:
Top-left: Flower
Second-left: Leaf
Top-right: Fruit
Bottom-right: Stem
Bottom-left: Root
11. sunlight
12. Solids
13. liquids
14. evaporates
15. 0
16. dissolves
17. insoluble
18. Using a magnet
19. filter
20. magnet
Let me know if you’d like this formatted as a printable answer key! 🌱🔬
---
1. Vertebrates are animals with _a backbone (or spinal column)_.
✔ Explanation: Vertebrates are defined by having an internal skeleton with a backbone that protects the spinal cord. Examples: humans, birds, fish, reptiles.
---
2. Mammals and _birds_ are warm blooded vertebrates.
✔ Explanation: Warm-blooded animals (endotherms) can regulate their own body temperature. Only mammals and birds are warm-blooded among vertebrates. Reptiles, amphibians, and fish are cold-blooded.
---
3. I am cold blooded, breathe through lungs and have dry scaly skin: _I am a reptile._
✔ Explanation: Reptiles are cold-blooded, breathe air with lungs, and have dry, scaly skin. Snakes, lizards, turtles, and crocodiles are examples.
---
4. I am a mammal but lay eggs. What am I? _A platypus (or echidna)._
✔ Explanation: Most mammals give birth to live young, but monotremes — like the platypus and echidna — are egg-laying mammals. They’re rare exceptions!
---
5. I live in water and can breathe under water through gills. _I am a fish._
✔ Explanation: Fish are aquatic vertebrates that use gills to extract oxygen from water. They cannot survive long out of water.
---
6–10. Label the parts of the plant using: Fruit, Leaf, Flower, Root, Stem
From top to bottom, left to right on the diagram:
- Top-left arrow → Flower (the yellow part at the top)
- Second arrow down on left → Leaf (green flat structures)
- Arrow pointing to red berry → Fruit (the ripe, edible part containing seeds)
- Arrow pointing to green stem → Stem (supports the plant and transports nutrients)
- Bottom arrow pointing to roots → Root (underground part that absorbs water and anchors the plant)
✔ So, labeled correctly:
> Top box (left): Flower
> Second box (left): Leaf
> Right box (top): Fruit
> Right box (bottom): Stem
> Bottom box (left): Root
*(Note: The arrows point to specific parts — match them as described above.)*
---
11. To grow healthily plants need air, water, nutrients and _sunlight (or light)._
✔ Explanation: Plants make their own food via photosynthesis, which requires sunlight. Without it, they can’t grow properly.
---
12. _Solids_ have a fixed shape but (13) _liquids_ take the shape of the container.
✔ Explanation: Solids keep their shape; liquids flow and take the shape of whatever container they’re in. Gases also take the shape of containers, but the question implies comparing solids and liquids.
---
14. When a liquid is heated it _evaporates_ faster.
✔ Explanation: Heating increases the energy of liquid molecules, causing them to escape into the air as vapor — this is evaporation. Boiling is rapid evaporation.
---
15. Water freezes at _0_ degrees Celsius.
✔ Explanation: This is a standard scientific fact. At 0°C, water changes from liquid to solid (ice).
---
16. Salt _dissolves_ in water.
✔ Explanation: Salt (sodium chloride) is soluble in water — it breaks into ions and mixes evenly to form a solution.
---
17. Stone is _insoluble_ in water.
✔ Explanation: Stone (like granite or limestone) does not dissolve in water — it may erode over time, but doesn’t form a solution.
---
18. _Using a magnet_ is the best way to separate mixed buttons and paperclips.
✔ Explanation: Paperclips are usually made of steel (magnetic), while buttons are plastic or wood (non-magnetic). A magnet will attract only the paperclips.
---
19. A _filter (or coffee filter)_ is ideal to separate coffee from water.
✔ Explanation: Filtration separates solids (coffee grounds) from liquids (brewed coffee) by passing the mixture through a porous material.
---
20. A _magnet_ can be used to separate pins from buttons.
✔ Explanation: Pins are typically metal (magnetic), while buttons are not. A magnet will pick up the pins, leaving buttons behind.
---
✔ Final Answer Summary:
1. a backbone
2. birds
3. reptile
4. platypus (or echidna)
5. fish
6–10:
Top-left: Flower
Second-left: Leaf
Top-right: Fruit
Bottom-right: Stem
Bottom-left: Root
11. sunlight
12. Solids
13. liquids
14. evaporates
15. 0
16. dissolves
17. insoluble
18. Using a magnet
19. filter
20. magnet
Let me know if you’d like this formatted as a printable answer key! 🌱🔬
Parent Tip: Review the logic above to help your child master the concept of free 4th grade science worksheet.
