CG Board Class 6 Science Structure and Functions of Living Organisms – I

CG Board Class 6 Science Structure and Functions of Living Organisms – I Notes / Textbook Exercises etc.

Plant Parts:

• Plants have different parts or organs for various functions.
• The main parts of a plant are roots, stems, leaves, and flowers.
• Roots are part of the root system and are usually found in the soil.
• Stems, branches, leaves, and flowers make up the shoot system and are above the ground.
• Plants start their life from seeds.

Types of Roots:

• There are two main types of roots: fibrous roots (found in monocotyledonous plants) and tap roots (found in dicotyledonous plants).
• Fibrous roots branch into fiber-like structures.
• Tap roots continue to grow and have branches arising from them.

Functions of Roots:

• Roots hold the soil firmly and help the plant stand erect.
• Roots absorb water and mineral salts from the soil, which are transported to various parts of the plant.

Functions of the Stem:

• Stems help the plant stand erect.
• Stems bear leaves, flowers, and fruits.
• Stems transport water, mineral salts, and synthesized food to different parts of the plant.

Importance of Leaves:

• Leaves are usually green due to chlorophyll, which is used for photosynthesis.
• Leaves synthesize food for the plant.

Structure of a Flower:

• Flowers are the reproductive organs of plants.
• A flower typically consists of a calyx (outer green whorl), corolla (colored whorl), stamens (male parts), and pistil (female part).
• Bisexual flowers have both stamen and pistil, while unisexual flowers have either pistil or stamen.

The Role of Fruits:

• The ovary of a flower develops into the fruit.
• Fruits contain seeds, which give rise to new plants and store food for them.

Modifications in Plants:

• Some plant parts are modified to carry out functions different from their normal ones.
• Modified roots, stems, and leaves may look different from their usual forms.
• Examples of modified parts include storage roots, supporting roots, and modified stems that store food.

Choose the correct option

• The ovary develops into –
• a. Seed b. Fruit c. Stem d. Tendril

 

• Internodes are found on
• a.Root b. Stem c. Flower d. Leaf

 

• Fibrous roots are found in –
• Basil (Tulsi) b. Grass c. Peas d. Beans

 

• An example of modified root is –
• Radish b. Potato c. Ginger d. Colocasia (Arbi)

 

• In the centre of the flower is found –
• a. The pistil b. The stamens c. The calyx d. The corolla

Fill in the blanks:

1. The potato is an example of a modified stem.
2. The flowers are the reproductive organ of the plant.
3. The leaves are green due to the presence of chlorophyll in them.
4. The dicotyledonous plants have taproots.
5. The roots in sugar cane perform the function of giving support.

Answer these –

Which system does the radical develop into?
The radical develops into the root system of the plant.