Olympiad Test: Plant Life - 2 - Class 5 MCQ

• A: Cotyledon: The cotyledon is the first leaf or seed leaf that comes out of the seed. It stores food for the young plant but does not grow first. The radicle grows before it.

• B: Plumule: The plumule is the part of the embryo that develops into the shoot or stem and leaves. While it eventually grows to form the plant’s upper parts, the radicle grows first.

• C: Radicle: The radicle is the root of the plant, and it grows first. Its job is to anchor the plant into the soil and help it absorb water and nutrients, which are needed for the plant to grow.

• D: Leaves: The leaves grow later after the shoot develops. They are responsible for photosynthesis, which helps the plant make food, but they do not grow first.

So, the correct answer is C: Radicle, because it grows first to help the plant get nutrients from the soil.

• A: Seeds will germinate: This is incorrect. While seeds need water to germinate, being submerged in water for too long can drown the seed and prevent it from germinating.

• B: Seed will not germinate: This is correct. If seeds are kept under water for too long, they can't get enough air (oxygen) and will not germinate.

• C: Water stops entering into the seed: This is incorrect. Water actually enters the seed during germination. However, too much water can suffocate the seed and prevent it from sprouting.

• D: Seed gives rise to seedling: This is incorrect if the seed is kept under water too long. Without proper air and conditions, the seed will not grow into a seedling.

So, the correct answer is B: Seed will not germinate.

• Kharif crops are grown during the monsoon season, usually from June to September. Examples include rice and cotton.
• Rabi crops are grown during the winter season, typically from October to March. Examples include wheat and mustard.
• Spongy is not a classification for crops.

Apples are classified as fruit crops and are typically grown in temperate climates. They are neither Kharif nor Rabi crops, which are specific to seasonal farming for cereals and other crops. Hence, the correct answer is D: None of these.

• Kharif crops are grown during the monsoon season, from June to September, when the rainfall is abundant.
• Peanuts (also known as groundnuts) are grown as Kharif crops because they require a warm climate and plenty of rainfall, which occurs during the monsoon season.

Therefore, the correct answer is A: Kharif.

• Tea plants are usually propagated from cuttings rather than seeds.
• A cutting from a mature tea plant is taken, and when planted in the soil, it develops roots and grows into a new plant. This method ensures that the new plant is genetically identical to the parent plant, maintaining the desired qualities of the tea plant.

Therefore, the correct answer is A: From cutting.

Deforestation leads to the destruction of natural habitats, which affects wildlife in multiple ways:

• Near extinction: Many species are pushed towards extinction due to the loss of their habitat and the inability to adapt to new environments.
• No shelter: Animals lose their homes, as forests provide shelter for many species.
• No food: Deforestation reduces the availability of food sources, as trees and plants are often crucial for the animals' diet.

Therefore, D: All of the above is the correct answer.

• Light: Some seeds need light to start germinating, while others can germinate in the dark.
• Water: Water is essential for seeds to absorb and soften their outer covering, allowing the embryo to sprout.
• Temperature: Seeds require a certain temperature range to trigger the germination process. Too hot or too cold can prevent germination.

Therefore, D: All of the above is the best-suited condition for seeds to germinate.

• A: Roots of some plants are also found above the ground: This is true. Some plants, like mangroves, have aerial roots that grow above the ground, helping the plant to breathe in waterlogged conditions.
• C: Best example of climbers is money plant: This is true. The money plant (Pothos) is a common example of a climber, as it uses its tendrils to climb structures.
• D: Some plants can grow completely under water: This is true. Aquatic plants like water lilies and water hyacinths can grow entirely underwater.

Since all the statements are true, the correct answer is B: All of these.

• A. Animal: The image shows a dandelion seed head, which disperses by wind, not animals.
• B. Water: The image shows a lotus seed pod, which disperses by water.
• C. Explosion: This image shows a water lily, which doesn’t disperse by explosion. Explosive dispersal typically occurs in plants like balsam.

Sugarcane is typically grown from stems, specifically from the cuttings of mature sugarcane stalks. These cuttings are planted in the soil, and new shoots emerge from the buds present on the stem.

• A: Roots: While roots are essential for the plant's growth, sugarcane is not grown from roots.
• C: Leaves: Sugarcane is not grown from leaves either.
• D: A and B both: Since sugarcane is grown from stems, this option is incorrect.

Therefore, the correct answer is B: Stems.

• A: Photosynthesis: This is the process by which plants make their own food using sunlight, water, and carbon dioxide. It is not the development process of a seed.
• B: Germination: Germination is the process in which a seed develops into a new plant. It starts when the seed absorbs water, swells, and the embryo inside the seed begins to grow.
• C: Transpiration: This is the process by which plants lose water vapor through small openings in their leaves. It is not related to seed development.
• D: Dormancy: Dormancy refers to a period when a seed or plant is inactive or not growing, often due to environmental conditions. It is not the development process.

So, the correct answer is B: Germination, as it is the process where the seed develops into a new plant.

• A: Water: Although some plants rely on water for dispersal, horsetail spores are primarily dispersed through the air, not water.
• B: Wind: Horsetail plants release their spores into the air, and they are carried by the wind to new locations. This is the primary method of dispersal for horsetail plants.
• C: Insects: Horsetail spores are not primarily spread by insects.
• D: Grazing animals: Horsetail spores are not dispersed by grazing animals.

So, the correct answer is B: Wind, as horsetail spores are mainly dispersed by the wind.

• Figure A shows a flower with big petals. Flowers like this are usually pollinated by insects because the bright petals attract them. These flowers are not suited for wind pollination.
• Figure B shows a plant with thin, feathery structures. These are perfect for catching pollen that floats in the wind. Plants like this are wind-pollinated because their pollen is light and can travel through the air.

Correct Answer: C: B only is pollinated by wind.

Farmers add both manure and chemical fertilizers to the soil to make it fertile:

• Manure: It is organic matter, typically from animals (like cow dung) or plants. Manure improves soil structure, adds nutrients, and enhances the growth of beneficial microorganisms. It also helps retain moisture in the soil.
• Chemical fertilizers: These are commercially produced substances that contain specific nutrients, like nitrogen, phosphorus, and potassium, which are essential for plant growth. They help increase crop yield but can harm the environment if used excessively.

Together, these two methods help improve soil fertility and support healthy plant growth.

Fertilization is the process where the sperm (male reproductive cell) joins with the egg (female reproductive cell) during sexual reproduction. This forms a fertilized egg or zygote, which eventually develops into a new organism.

• Pollination refers to the transfer of pollen from one flower to another, which can lead to fertilization in plants.
• Germination is the process where a seed develops into a new plant.
• Flowering refers to the production of flowers, which is part of the reproductive process in many plants.