Here's the completed worksheet with correct answers and explanations:
---
1. Photosynthesis is the process by which plants make their own _food_.
✔ Explanation: Photosynthesis converts light energy into chemical energy stored in glucose (a type of food), which the plant uses for growth and energy.
---
2. Plants use _sunlight_, _carbon dioxide_, and _water_ to produce glucose and oxygen.
✔ Explanation: The basic chemical equation for photosynthesis is:
6CO₂ + 6H₂O + sunlight → C₆H₁₂O₆ (glucose) + 6O₂
So, the three essential inputs are sunlight, carbon dioxide, and water.
---
3. The green substance called _chlorophyll_ helps in absorbing sunlight.
✔ Explanation: Chlorophyll is the pigment in plant cells (mainly in chloroplasts) that captures light energy — especially red and blue wavelengths — to power photosynthesis.
---
4. The small pores called _stomata_ help in absorbing carbon dioxide.
✔ Explanation: Stomata (singular: stoma) are tiny openings primarily on the underside of leaves that allow gas exchange — taking in CO₂ and releasing O₂ and water vapor.
---
5. The _guard cells_ help in controlling the rate of transpiration.
✔ Explanation: Guard cells surround each stoma and regulate its opening and closing. When they swell (turgid), stomata open; when they shrink (flaccid), stomata close — thus controlling water loss (transpiration) and gas exchange.
---
6. Water is transported from the roots to the stem and leaves via the _xylem_.
✔ Explanation: Xylem is a specialized vascular tissue in plants that transports water and dissolved minerals upward from the roots through the stem to the leaves.
---
✔ Final Answer Key:
1.
food
2.
sunlight,
carbon dioxide,
water
3.
chlorophyll
4.
stomata
5.
guard cells
6.
xylem
Let me know if you’d like a diagram or mnemonic to remember this! 🌿☀️
Parent Tip: Review the logic above to help your child master the concept of photosynthesis worksheet pdf.
