Olympiad Test Level 2: Plants and Animals - Class 3 MCQ

Plants need water, minerals and carbon dioxide to prepare food. Water and minerals are absorbed from the soil through the roots.

The incorrect option is Option B: "Frogs eat lions."

Explanation:

• Option A: Grass is eaten by deer, grasshoppers, and rabbits. Correct as per the food web
• Option B: Frogs do not eat lions. Incorrect statement
• Option C: Hawks eat snakes. Correct as per the food web
• Option D: Lions eat deer. Correct as per the food web

• The stem acts like a highway, transporting water and minerals absorbed by the roots to the leaves and other parts of the plant.
• It supports the plant, allowing it to stand upright and reach sunlight, which is essential for photosynthesis.
• Without a proper stem, plants would struggle to distribute nutrients effectively, affecting their growth and health.

• Germination is the process where a seed begins to grow and develops into a baby plant.
• It starts when the seed absorbs water, swelling and breaking its outer shell.
• Temperature and light also play vital roles in this process.
• As the seed germinates, it develops roots, stems, and leaves, establishing itself as a new plant.
• This is a crucial phase in a plant's life cycle, leading to growth and reproduction.

The incorrect statement is made by Adya, as grass and wheat have fibrous roots, not taproots.

Correct statements:

• Anant: Roots of turnip, radish, and carrot are edible. 
• Vihaan: Leaves of fenugreek and lettuce are edible. 
• Vidushi: Potato and ginger have underground stems that store food. 

Thus, the incorrect statement is from Adya.

The relationship is based on storage organs.

• Ginger is a storage stem.
• Cabbage is a storage leaf.

Thus, the answer is Cabbage.

To determine the correct food chain, we analyze the feeding relationships:

1. Grasshopper: A herbivore that eats plants.
2. Frog: A carnivore that eats insects like grasshoppers.
3. Eagle: A carnivore that can eat small animals like frogs.

The correct sequence is Grasshopper → Frog → Eagle, representing a plausible flow of energy in the food chain, as eagles can prey on frogs.

The correct answer is Option (B)
The Clouded leopard and Skunk both eat meat, just like animal X and Y, and they have similar eating habits.

Solution:

• Plants with weak stems often have tendrils.
• Tendrils help these plants to climb and gain support by attaching to other structures.

Solution:

• Chlorophyll is a green pigment found in the chloroplasts of leaves.
• It absorbs energy from sunlight.

Solution:

• The correct answer is A. Frog.
• Frogs can live both in the water and on the land.

The shoots of a plant include:

• Stem
• Branches
• Leaves
• Flowers
• Fruits
• Seeds

So, they bear all these parts.

• Leaves P and Q cannot make food because they lack sunlight.
• Photosynthesis requires both sunlight and water to produce food.
• Leaves without access to these essentials cannot perform photosynthesis.
• Thus, option B is correct as leaves P and Q cannot make food due to the absence of sunlight.

New plants can reproduce by vegetative propagation.

Mushrooms obtain their food through a process called decomposition. They do not make their own food like plants.

• Mushrooms feed on dead and decaying plants.
• They break down these materials to get the nutrients they need.

This process makes mushrooms important for the environment as they help recycle nutrients back into the soil.