Class 4 Science - How Plants Make Food 2 April - 20-21.docx 1 ... - Free Printable

Let's solve the worksheet step by step and provide clear explanations for each answer.

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I. Fill in the blanks using the appropriate word:

Words to use:
Leaves, chlorophyll, erect, seeds, stem, flower, soil, prepared

(i) Roots hold the plant in the _______ firmly.
✔ Answer: *soil*
🔹 Explanation: Roots anchor the plant into the soil, holding it firmly in place.

(ii) A healthy _______ helps the plant to stand _______.
✔ Answer: *stem*, *erect*
🔹 Explanation: The stem provides structural support, allowing the plant to stand upright (erect).

(iii) Green colour of the leaves is due to _________.
✔ Answer: *chlorophyll*
🔹 Explanation: Chlorophyll is the green pigment present in leaves that absorbs sunlight for photosynthesis.

(iv) Most of the plants have _________ to produce fruits and _________.
✔ Answer: *flower*, *seeds*
🔹 Explanation: Flowers are reproductive parts of plants; they develop into fruits and contain seeds after pollination.

(v) Stem carries the _________ food from __________ to the other parts.
✔ Answer: *prepared*, *leaves*
🔹 Explanation: During photosynthesis, leaves prepare food (glucose). The stem transports this prepared food to other parts of the plant.

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II. Write YES or NO

(i) Are there fine tubers in the stem of a plant?
✘ Answer: *NO*
🔹 Explanation: Tubers are modified underground stems (like potatoes), but not "fine tubers" in general stems. This statement is misleading or incorrect.

(ii) Does some flowers too contain seeds?
✔ Answer: *YES*
🔹 Explanation: After fertilization, the ovary of the flower develops into a fruit containing seeds.

(iii) Do leaves prepare food for the plant?
✔ Answer: *YES*
🔹 Explanation: Leaves perform photosynthesis to make food (glucose) for the plant.

(iv) Are roots necessary for the growth of a plant?
✔ Answer: *YES*
🔹 Explanation: Roots absorb water and minerals from the soil, which are essential for growth and survival.

(v) Does a plant get water from the soil without the roots?
✘ Answer: *NO*
🔹 Explanation: Roots are the main organs responsible for absorbing water and minerals from the soil. Without roots, a plant cannot efficiently take up water.

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III. Answer the following questions:

(i) What are the main parts of a plant?
✔ Answer: The main parts of a plant are:
- Roots
- Stem
- Leaves
- Flowers
- Fruits
- Seeds

🔹 Explanation: These parts work together for growth, reproduction, and food production.

(ii) From where does the plant get water and minerals?
✔ Answer: Plants get water and minerals from the soil through their roots.
🔹 Explanation: Root hairs increase surface area and absorb water and dissolved minerals from the soil.

(iii) What are the functions of the stem in a plant?
✔ Answer: Functions of the stem include:
- Supporting the plant and holding leaves, flowers, and fruits in position.
- Transporting water and minerals from roots to leaves (via xylem).
- Transporting prepared food from leaves to other parts (via phloem).
- Storing food in some plants (e.g., in stems like sugarcane).

(iv) Where is food for the plant prepared?
✔ Answer: Food is prepared in the leaves.
🔹 Explanation: Leaves carry out photosynthesis, a process that produces food (glucose) using sunlight, carbon dioxide, and water.

(v) What is the function of roots in a plant?
✔ Answer: Functions of roots:
- Anchor the plant in the soil.
- Absorb water and minerals from the soil.
- Store food in some plants (e.g., carrots, radishes).
- Help in vegetative propagation in some plants.

(vi) What is photosynthesis?
✔ Answer: Photosynthesis is the process by which green plants make their own food using sunlight, carbon dioxide (from air), and water (from soil), in the presence of chlorophyll.
🔹 Chemical equation:
Carbon dioxide + Water → Glucose + Oxygen
(Sunlight and chlorophyll required)

(vii) Which substance does the plant get from air?
✔ Answer: The plant gets carbon dioxide (CO₂) from the air.
🔹 Explanation: Carbon dioxide enters the leaves through tiny pores called stomata and is used in photosynthesis.

(viii) Why are leaves green in color?
✔ Answer: Leaves are green because they contain a green pigment called chlorophyll.
🔹 Explanation: Chlorophyll absorbs sunlight (especially red and blue light) and reflects green light, making leaves appear green. It is essential for photosynthesis.

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✔ Final Summary:

This worksheet tests understanding of plant structure and function, especially focusing on photosynthesis, plant parts, and their roles. The key concepts covered are:
- Role of roots, stem, leaves, flowers
- Process of photosynthesis
- Importance of chlorophyll and sunlight
- Transport of water and food

All answers are based on basic science concepts taught in Class IV under the topic *"How Plants Make Food."*

Let me know if you'd like this formatted as a printable answer sheet!