Olympiad Test: Plants - Class 6 MCQ

• Statement 1 is true: Plants that live for many years and bear fruits and flowers are called long-living plants. These are typically perennials such as trees and shrubs.
• Statement 2 is false: Trees and shrubs are actually examples of long-living plants, not short-living plants. Short-living plants, such as annuals, complete their life cycle in one year or growing season.

• Statement 1 is false: The shoot system includes parts of the plant above the soil, such as stems, leaves, and flowers. The roots are part of the root system, not the shoot system.
• Statement 2 is also false: The shoot system is not responsible for absorbing water and minerals from the soil. This is the function of the root system. The shoot system is mainly involved in photosynthesis, reproduction, and transporting water and nutrients within the plant.

• Statement 1 is true: Petals are indeed the brightly colored parts of a flower that attract insects, aiding in pollination.
• Statement 2 is false: The sepal is not part of the male organ of the flower. It is a protective leaf-like structure that surrounds and protects the flower bud before it blooms. The male organ of the flower is the stamen, which consists of the anther and filament.

• Fibrous roots are characterized by a network of many thin and small roots that grow from the base of the stem. They do not have a single main root (which is typical of taproots).
• These roots spread out and form a dense mass near the surface of the soil, helping to anchor the plant and absorb water and nutrients efficiently.
• Fibrous roots are commonly found in plants like grasses and other herbaceous plants, rather than trees.

• The stem of a plant primarily serves as a support structure, holding the plant upright so that the leaves can receive sunlight for photosynthesis.
• It also acts as a transport system, carrying water, minerals, and nutrients from the roots to the leaves and other parts of the plant, and transporting the products of photosynthesis from the leaves to the rest of the plant.
• While stems may store food in some plants (e.g., potato tubers), their main functions are support and transport.

• Carrot is a taproot plant, meaning it has a single, thick main root that grows deep into the soil.
• Grass has fibrous roots, which are a network of many thin, small roots that grow from the base of the stem.

• A swollen underground stem is a type of modified stem known as a tuber (such as a potato). The swollen part stores food for the plant.
• Other types of modified stems include tendrils (used for climbing), runners and stolons (which are horizontal stems that help in vegetative propagation), but these are not typically swollen.

• Statement 1: Some leaves are modified into tendrils (e.g., in pea plants) to help the plant climb and support itself.
• Statement 2: In cactus plants, the leaves are modified into spines to reduce water loss, helping the plant conserve moisture in dry environments.

Both statements are correct.

• Statement 1 is true: Kharif crops (summer crops) are indeed sown during the monsoon season, which typically occurs from June to September in India.
• Statement 2 is false: Rabi crops are grown in winter (from October to March) and harvested in the spring, not grown in summer. Examples of Rabi crops include wheat, barley, and mustard.

Thus, the correct option is C.

• Statement 1: True. Flowers are the reproductive organs of the plant. They contain the male (stamens) and female (pistil) reproductive parts, and through pollination and fertilization, flowers enable the plant to reproduce.
• Statement 2: False. While leaves are crucial for photosynthesis (producing food for the plant), they do not directly participate in the plant's reproduction process. Reproduction occurs through flowers, seeds, and fruits.

So, the correct answer is B: Statement 1 is true but statement 2 is false.