Animals With Extraordinary Abilities
Discover the remarkable ways animals sense their surroundings, move, hunt, and survive.
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Questions with solutions-
1. சரியான பதிலைத் தேர்ந்தெடுக்கவும்.
Which ability is the bat using?
A bat sends out high-pitched calls and listens to the returning echoes to locate insects in the dark.
- Echolocation
- Heat detection
- Night vision
The key information comes from sound, not light or temperature.
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- Echolocation
The delay before an echo returns helps the bat judge how far away an insect is.
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2. சரியான பதிலைத் தேர்ந்தெடுக்கவும்.
What mainly gives the gecko's toes their grip?
Many geckos can climb smooth glass and hang upside down without leaving a sticky trail.
- Tiny claws that dig into the glass
- Microscopic hairs that make close contact with the surface
- Suction cups that trap air beneath the toes
Its grip depends on contact at a very small scale.
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- Microscopic hairs that make close contact with the surface
Weak forces between molecules add up across the many tiny contact points, creating a strong grip.
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3. சரியான பதிலைத் தேர்ந்தெடுக்கவும்.
What feature of a dolphin's sleep helps it remain alert?
A resting dolphin still needs to surface to breathe and monitor its surroundings.
- Both halves of its brain always enter deep sleep together.
- Only its muscles rest; its brain never sleeps.
- One half of its brain can rest while the other remains more alert.
Rest does not have to involve the whole brain at once.
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- One half of its brain can rest while the other remains more alert.
During this kind of sleep, one eye often stays open to help the dolphin monitor its surroundings.
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4. சரியான பதிலைத் தேர்ந்தெடுக்கவும்.
How can these patterns help a bee?
Some flowers have ultraviolet patterns that bees can see, although humans cannot.
- They can guide it toward the flower's nectar.
- They can show it the route back to its hive.
- They can identify which bee last visited the flower.
Consider what a bee is looking for when it visits a flower.
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- They can guide it toward the flower's nectar.
These markings are often called nectar guides: a flower that looks plain to us may look patterned to a bee.
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5. சரியான பதிலைத் தேர்ந்தெடுக்கவும்.
How do these feather features help an owl approach prey unnoticed?
Some owls have comb-like edges on their flight feathers and a soft, velvety feather surface.
- They increase the owl's sensitivity to high-pitched sounds.
- They improve the owl's vision in very low light.
- They reduce the noise of air moving over the wings.
Think about the sound a moving wing can create.
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- They reduce the noise of air moving over the wings.
Quieter flight also helps an owl hear faint sounds from prey without its own wing noise getting in the way.
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6. சரியான பதிலைத் தேர்ந்தெடுக்கவும்.
What does this arrangement allow an octopus's arms to do?
An octopus has many nerve cells in its arms, not just in its central brain.
- Wait for the central brain to direct every small movement
- Manage some movements and responses to touch locally
- Replace the central brain in controlling the entire animal
Information can be processed close to where it is received.
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- Manage some movements and responses to touch locally
This local control helps flexible arms explore and handle objects while the central brain coordinates broader actions.
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7. சரியான பதிலைத் தேர்ந்தெடுக்கவும்.
How can these cells produce a powerful electric discharge?
An electric eel has thousands of specialized electric cells. Each cell produces only a small voltage.
- The cells discharge together, and their voltages add up.
- One cell supplies the entire discharge while the others rest.
- The cells collect electricity already present in the water.
Think about how several batteries can work together.
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- The cells discharge together, and their voltages add up.
Electric eels also use weaker electric signals to sense their surroundings, not just powerful discharges to attack or defend themselves.
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8. சரியான பதிலைத் தேர்ந்தெடுக்கவும்.
Why is this useful in a dry habitat?
Desert kangaroo rats produce very concentrated urine. Their kidneys return much of the filtered water to the blood.
- It allows them to make new water directly from mineral salts.
- It prevents all water loss through their skin and breathing.
- It lets them remove waste while losing relatively little water.
Waste still has to leave the body, but water is valuable.
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- It lets them remove waste while losing relatively little water.
Kangaroo rats also obtain water when their bodies break down nutrients from food.
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9. சரியான பதிலைத் தேர்ந்தெடுக்கவும்.
What must the archerfish account for when aiming?
An archerfish shoots water at insects above the surface. Light bends as it passes between air and water, making a target appear shifted from its actual position.
- The insect being underwater despite appearing above the surface
- The difference between the insect's apparent and actual positions
- The water jet bending in exactly the same way as the light
Where the target appears to be is not necessarily where it is.
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- The difference between the insect's apparent and actual positions
This bending of light is called refraction; it also makes a straw in a glass of water appear bent.
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10. சரியான பதிலைத் தேர்ந்தெடுக்கவும்.
What does the extra glucose help do?
Wood frogs can survive winter with ice forming outside many of their cells. Glucose, a type of sugar, builds up in their tissues.
- Limit cell damage caused by freezing and water loss
- Keep every part of the frog above freezing
- Make the heart beat faster throughout the frozen period
Surviving some freezing is different from preventing all freezing.
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- Limit cell damage caused by freezing and water loss
The frog's heart can stop during freezing and start again after it thaws.
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11. சரியான பதிலைத் தேர்ந்தெடுக்கவும்.
What is the main benefit of this arrangement?
In an emperor penguin's legs, warm blood traveling toward the feet flows close to cold blood returning from them.
- The feet stay as warm as the body's core.
- The returning blood carries extra cold into the body's core.
- Heat passes to the returning blood, reducing heat loss through the feet.
Heat can move between nearby blood vessels before reaching the feet.
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- Heat passes to the returning blood, reducing heat loss through the feet.
The feet can remain much cooler than the body, reducing how much heat they transfer to the ice.
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12. சரியான பதிலைத் தேர்ந்தெடுக்கவும்.
What causes the additional force?
A mantis shrimp strikes prey with a fast-moving club. An additional burst of force can follow even without a second strike.
- The club releases stored electrical energy into the water.
- A vapor bubble forms and collapses, creating a pressure shock.
- The club releases a jet of venom under high pressure.
The effect comes from a sudden change in the surrounding water pressure.
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- A vapor bubble forms and collapses, creating a pressure shock.
This process is called cavitation, and it can also occur around fast-moving boat propellers.