Olympiad Test Level 2: Birds and Common Insects Class 3 Science MCQs

The Hummingbird is the smallest bird in the world. It has a long beak that helps it drink nectar (a sweet juice) from flowers.
Hummingbirds love flowers because they get food from them. They can even stay still in the air while drinking and are the only birds that can fly backwards!

All the statements are true:

1. Beaks can be used as weapons (i): Some birds use their beaks to fight or catch prey.

2. Beaks are primarily used for feeding (ii): Birds use their beaks mainly to eat.

3. Beaks are used to preen and make nests (iii): Birds use their beaks to clean their feathers and build nests.

4. Beaks are used in courtship displays (iv): Some birds use their beaks to show off to attract mates.

So, all four statements are correct.

Insects have three main body parts: Head, Thorax, and Abdomen. They do not have a Neck like humans do.

• Head is where the eyes and mouth are.
• Thorax is where the legs and wings are attached.
• Abdomen is the part where the stomach and other organs are.

So, Neck is different from the other parts.

Insects have three pairs of legs, and these legs are attached to the thorax, which is the middle part of their body.
The head contains the eyes and mouth, and the abdomen contains organs like the stomach, but the legs are not connected to these parts.

So, the legs are joined to the thorax.

The rearing of bees is called Apiculture, not Sericulture.

• Apiculture is the practice of keeping and caring for bees to produce honey and other bee products.
• Sericulture is the rearing of silkworms to produce silk.

So, the statement is False.

In the life cycle of insects like butterflies, the correct order is:

1. Egg: The insect starts life as an egg.
2. Larva: The egg hatches into a larva (like a caterpillar).
3. Pupa: The larva turns into a pupa (chrysalis) as it undergoes a transformation.
4. Adult: Finally, the adult insect emerges from the pupa.

So, the correct order is Egg → Larva → Pupa → Adult.

In complete metamorphosis, an insect goes through four stages:

1. It starts as an egg.
2. The egg hatches into a larva (like a caterpillar).
3. The larva turns into a pupa (like a cocoon or chrysalis).
4. The pupa changes into the adult insect.

So, the insect doesn't look like the adult at first. It starts as a small caterpillar and then grows into a pupa before becoming an adult.

A Duck has webbed feet that help it swim easily in water. The webbing acts like paddles to move through the water.

• A Hen doesn’t have webbed feet. It stays on the ground and can fly a little.
• An Eagle flies high in the sky but has claws, not webbed feet.
• A Pigeon has regular feet for walking and sitting, not webbed feet.

So, the correct answer is Duck.

Birds migrate because of two main reasons:

1. Environmental factors: This includes things like weather and food. Birds fly to warmer places when it gets too cold and to find more food.

2. Genetic factors: Birds are born with an instinct to migrate. They know where to go and when, without learning it.

So, birds migrate due to changes in weather and natural instincts.

The process where an insect sheds its old skin as it grows bigger and forms a new one is called Moulting.

• Insects need to shed their skin because their body grows, but their outer skin (exoskeleton) does not stretch.
• This allows them to grow into a bigger body with new skin.

So, the correct answer is Moulting.

• Hen can fly only a little bit and very close to the ground.
• Sparrow and eagle fly high in the sky.
• Penguin cannot fly.

So, the bird that flies at low height is hen.

An Eagle has very sharp eyes that help it see its prey from high up in the sky. It can spot small animals or fish from far away and swoop down to catch them.

• A Hen, Sparrow, and Crane don’t have as sharp eyesight as an eagle. They focus more on things near the ground.

So, the correct answer is Eagle.

One way insects can be harmful is by spreading diseases. For example, mosquitoes can carry diseases like malaria or dengue and spread them when they bite people.

• Eating other insects is not harmful in general.
• Making honey, beeswax, and silk are helpful things insects do.
• Being food for other animals is a natural part of the food chain.

So, the correct answer is They spread diseases.

Termites eat and damage wood products. They are small insects that feed on wood and can destroy furniture, doors, and other wooden items over time.

• Lice live on animals or humans but do not eat wood.
• Honey bees make honey and do not damage wood.
• House flies do not eat or damage wood.

So, the correct answer is Termite.