Super Senses - 2 Class 5 Worksheet EVS Chapter 1

Q1: Fill in the blanks

(i) _____ sleeps 17 hours a day.
Ans: Sloth
Sloths are known for their slow metabolism and long hours of sleep, often resting for up to 17 hours a day.

(ii) _______ make sounds to send messages inside the water body.
Ans: Dolphins
Dolphins use a variety of sounds to communicate with one another in their aquatic environments.

(iii) ________ cannot see many colors as humans.
Ans: Animals
Many animals have a different range of color vision compared to humans, often seeing fewer colors.

(iv) Animals can see and ______ at night.
Ans: navigate
Many animals possess adaptations that allow them to see and navigate effectively in low-light conditions.

(v) Elephants have _________ ears.
Ans: Big
Elephants have large ears that help them regulate body temperature and enhance their hearing.

Q2: Multiple choice Questions

(i) When a bird focuses both eyes on an object, what can it estimate?
(a) The distance
(b) The size
(c) The kind
(d) The shadow
Ans: (a)
By focusing both eyes on an object, birds can estimate the distance to that object using binocular vision.

(ii) From what distance an eagle in the sky can see roti on the ground.
(a) 100 mts
(b) 8 mts
(c) 60 mts
(d) 10mts
Ans: (b)
Eagles have exceptional eyesight, but the distance they can see objects like a roti can vary; 8 meters is a plausible estimate for close visibility.

(iii) With which body part can a lion sense the movement and vibration in the air?
(a) whiskers
(b) tail
(c) ears
(d) paws
Ans: (a)
Lions use their whiskers to detect movement and vibrations in their environment, helping them sense prey and other animals.

Q3: True or False

(i) Langurs use a special warning call to alert others of dangers like tigers or leopards.
Ans: True
Langurs have distinct calls that serve to warn their group of potential threats, including predators like tigers and leopards.

(ii) Birds give alarm calls to warn about danger, and some birds have different sounds for different kinds of dangers.
Ans: True
Many bird species have evolved specific alarm calls that convey different messages depending on the type of threat they detect.

(iii) Fishes give alarm calls by electric signals.
Ans: False
While some fish can generate electric signals, they do not use them as alarm calls. Fish typically use other methods for communication and signaling danger.

(iv) By tapping a desk once and listening carefully, and then tapping again while placing your ear on the desk, you can hear a difference in the sound of the tap.
Ans: True
This phenomenon occurs because sound travels differently through different mediums, and placing your ear on the desk can enhance the sound perception.

(v) Some animals exhibit different behaviours when an earthquake or storm is about to occur, providing an indication of the danger.
Ans: True
Many animals are sensitive to environmental changes and may display unusual behavior prior to natural disasters, which can serve as warnings for humans.

Q4: Name the following:

(i) Who has different senses than humans?
Ans: Animals
Animals have different senses compared to humans. While humans primarily rely on sight and hearing, many animals possess enhanced abilities in areas such as smell, vision, and hearing.

(ii) Which insects guard their holes?
Ans: Ants
Ants are well-known for their behaviour of guarding their holes. They protect their nests from intruders and help maintain the safety of their colony.

(iii) Which animal can return to the place where it releases the waste (urine or shit)?
Ans: Dogs
Dogs are known to return to the place where they release waste, whether it be urine or faeces. This behaviour is often attributed to their strong sense of smell and territorial instincts, allowing them to recognise their scent and mark their territory.

(iv) Which part of the plant smells good?
Ans: Flowers

(v) Name one bird that can see clearly far away things.
Ans: Eagles
Eagles are renowned for their exceptional vision, allowing them to see clearly at great distances. These birds possess keen eyesight, which is essential for hunting and spotting prey from afar.

Q5: Short answer type questions

(i) Why did the ants behave the way they did when their path was blocked?
Ans: The ants behaved like that because they followed a smell trail left by their fellow ants to find their way.

(ii) How do some male insects recognize their females?
Ans: Some male insects recognize their females by their smell. This sense of olfaction allows them to detect specific pheromones released by females, which signal their readiness to mate.

(iii) How do mosquitoes know where you are?
Ans: Mosquitoes can find you by the smell of your body, the smell of the sole of your feet, and the heat of your body.

(iv) How can a silkworm find its female from many kilometres away?
Ans: A silkworm can locate its female from several kilometres away by detecting her pheromones, which are chemical signals released into the air. This ability allows the male silkworm to navigate long distances to find a mate.

(v) What did a scientist discover through experiments with ants?
Ans: Through experiments, a scientist found out that as ants move, they leave a smell on the ground which other ants follow to find their way.