Olympiad Test Level 1: Plants and Animals Solved MCQs Class 3 Science

All flowering plants require three main parts for normal survival: roots, stem and leaves.
Plant (a) does not have roots.
Plant (b) does not have leaves.
Plant (c) also does not have a leaves.
Plant (d) has roots, stem and leaves, so it can survive

The part of the plant that grows above the ground is called the shoot. The shoot includes the stem, leaves, and flowers.

• Root: This part grows below the ground.
• Fruit: This is the part of the plant that contains seeds, usually growing from flowers.
• Flower: The part of the plant that helps in reproduction, often growing above the ground.

So, the correct answer is Shoot.

A horse belongs to the herbivore category because it eats plants, grass, and other plant-based food.

• Carnivore: Animals that eat other animals.
• Omnivore: Animals that eat both plants and animals.
• Producer: Plants that make their own food through photosynthesis.

So, the correct answer is Herbivore.

Omnivores are animals that eat both plants and the flesh of other animals. Examples include humans, bears, and crows.

• Carnivore: Animals that eat only other animals (like lions or tigers).
• Herbivore: Animals that eat only plants (like cows or deer).
• All of these: Not correct because only omnivores eat both plants and animals.

So, the correct answer is Omnivore.

The whale is a mammal, and mammals give birth to live young ones.

• Insect: Most insects lay eggs.
• Frog: Frogs lay eggs that hatch into tadpoles before becoming adult frogs.
• Snake: Some snakes lay eggs, while others give birth to live young.

So, the correct answer is Whale.

Grass is known as a producer because it makes its own food through photosynthesis using sunlight, water, and carbon dioxide.

• Insects: They are consumers, not producers, as they feed on plants or other animals.
• Cow: Cows are consumers, as they eat plants.
• Tiger: Tigers are carnivores and consumers, as they eat other animals.

So, the correct answer is Grass.

​​​The long and thick trunk of an elephant has multiple functions:

• It helps break branches and leaves to eat.
• It is used for drinking water by sucking it up and then blowing it into the mouth.
• It also helps in sucking water and blowing it into its mouth.

So, the correct answer is All of the above.

Monkey is an animal that lives on trees. Monkeys are arboreal, meaning they spend most of their time in trees for safety and food.

• Rabbit: Lives in burrows.
• Camel: Lives in deserts.
• Tortoise: Lives on land or in water, but not on trees.

So, the correct answer is Monkey.

Thorns on desert plants help protect the plant from being eaten by animals. They act as a defense mechanism, making it difficult for animals to eat the plant.

• Catch food: Thorns do not catch food.
• Store water: Desert plants store water in their stems, not in the thorns.
• Attract bees: Thorns do not attract bees; flowers do.

So, the correct answer is They protect the plant from being eaten by animals.

A chameleon can change its color to hide from enemies. This helps it stay safe.

• Parrot: Parrots are colorful but can't change their color.
• Snail: Snails have shells but can't change color.
• Snake: Snakes can't change color, but some blend into their surroundings.

So, the correct answer is Chameleon.

• The sentence mentions that the lost animal is an amphibian and feeds on insects only, which means it is a carnivore (since it eats only other animals, in this case, insects).
• Amphibians do not give birth to young ones, they lay eggs.
• Amphibians live both on land and in water, not only on land.
• The sentence says the animal can lay many eggs, not just one at a time.

So, the correct answer is It is a carnivore.

Stomata are small openings on the leaves that help in the exchange of gases, allowing carbon dioxide to enter and oxygen to exit during photosynthesis.

• Veins: These are part of the plant's vascular system that transport water and nutrients.
• Lentis: These are small pores found on the stems of plants, not leaves.
• Lamina: This is the broad, flat part of the leaf.

So, the correct answer is Stomata.

A scavenger is an animal that feeds on the flesh of dead animals.

Vulture, Hyena and Crow feed mainly on dead animals and are therefore scavengers.

Lion hunts and kills other animals for food; it is primarily a predator, not a scavenger.

Hence, the odd one out is Lion. Option B is correct.

Fibrous root is found in plants like banana. These roots are thin and spread out in many directions from the base of the stem.

• Bean: Has a tap root (a main root with smaller roots).
• Carrot: Has a tap root (a large central root).
• Beetroot: Has a tap root as well.

So, the correct answer is Banana.

Potato is a modified stem. It is a tuber, which is a type of stem that stores food and grows underground.

• Carrot: It is a root that stores food.
• Radish: It is also a root.
• None of the above: Incorrect, as potato is a modified stem.

So, the correct answer is Potato.

• The chart shows a food chain starting from grass, and leading to a snake.
• The sequence involves a grasshopper eating the grass, which is then eaten by a frog, and finally the snake eats the frog.

So, the correct answer is Grasshopper, Frog.

1. Outline of a leaf – This corresponds to Margin (c).
2. Exchange of gases – This corresponds to Stomata (d).
3. Broad part of leaf – This corresponds to Lamina (a).
4. Middle line – This corresponds to Vein (b).

So the correct answer is:

Option (d): (i) -c, (ii) -d, (iii) -a, (iv) -b.

Fruits provide protection to the seed. The fruit surrounds the seed and helps protect it until it is ready to be dispersed for germination.

• Flower: The flower helps in reproduction, but not directly in protecting the seed.
• Leaf: Leaves are for photosynthesis, not for protecting seeds.
• Plant: The plant as a whole is not protected by the fruit, but rather the seed inside the fruit.

So, the correct answer is Seed.

Solution:

• Statement (i) - True: Fruits are often the fleshy part of a tree that contains seeds.
• Statement (ii) - False: The shoot grows above the ground, not below.
• Statement (iii) - True: The flower is indeed the reproductive part of the plant.
• Statement (iv) - False: Roots absorb water and nutrients (not food) from the soil and transport them throughout the plant, not just to the leaves.

The bark of the tree protects the trunk. It acts as a protective outer covering, shielding the tree from physical damage, pests, and disease.

• Stem: The stem is another word for the trunk, not something that protects it.
• Pigment: Pigments are responsible for color in plants but don’t protect the trunk.
• Roots: Roots anchor the tree to the ground and absorb nutrients, but don’t protect the trunk.

So, the correct answer is Bark.