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Adventist Youth Honors Answer Book/Nature/Cetaceans

Cetaceans
Nature
South Pacific Division
Talent Stage 2 Answer-Keys 06.jpg
Yr of Introduction: Unknown

1. In what means is the Cetaceans household completely different from most different sea life?[edit]

The Cetacean household is completely different from most different sea life as a result of Cetaceans are mammals.
This implies :

  • A: They offer beginning to reside infants. The biggest whale is the Blue Whale and its new child child shall be as much as 7 meters lengthy and weigh as much as 2700 kg, (about as a lot as two automobiles).
The big whale moms transfer to heat tropical waters to provide beginning and spend about six months there so their infants can develop a layer of fats (blubber) to assist them survive the chilly frigid waters the place they reside for the opposite six months. Whereas within the heat waters the grownup whales don’t eat in any respect.
  • B: They feed their infants milk. The child will drink 400 liters of milk and achieve 90 kg a day for the primary seven months of its life.
  • C: They’ve heat blood. A blue whale’s coronary heart is the scale of a small automobile and its aorta (the primary coronary heart artery) is the diameter of a basketball.
  • D: They breathe air similar to us. Which means they have to maintain their breath whereas beneath the water. A Sperm Whale can maintain its breath for 30 minutes. Once they need to breathe they arrive to the floor, blow out moist air from their lungs and snatch a brand new breath. Their nostrils are known as blowholes. Baleen whales have two blowholes and toothed whales one blowhole. The whale hunters might inform what kind of whale it was by the form of the spout blown out.
  • E: They’ve some hair on their our bodies. It’s possible you’ll not simply see the hair on a whale however most have small whiskers on the chin.

Along with the traits of mammals listed above, cetaceans differ from different sea life in different methods as properly. Considered one of these variations between a cetacean and a fish is the form of the tail. The tail of a fish is vertical and strikes back and forth when the fish swims. The tail of a cetacean – known as a “fluke” – is horizontal and strikes up and down.

2. Clarify the distinction between Baleen and Toothed Whales.[edit]

Baleen Whales[edit]

The baleen whales, additionally known as whalebone whales or nice whales, are one in every of two suborders of the Cetacea (whales, dolphins and porpoises). Baleen whales, somewhat than having enamel, have baleen plates which hold from the higher jaw and are used for filtering meals from water. This distinguishes them from the toothed whales. Baleen is a sort of hair however stiff like a gentle fingernail. It grows from the roof of the mouth in two rows and is used to filter out meals from water. The whale is ready to absorb an enormous mouthful of water after which squeeze its mouth shut and squeeze out the water whereas straining out the meals. Baleen whales feed on tiny creatures known as krill and wish a lot of these to gas their our bodies. A lot of the large whales are baleen whales, e.g. Blue whale, humpback whale and fin whale. Krill is one in every of their main meals, which they pressure by way of their baleen.

Baleen whales are typically bigger than toothed whales, and females are bigger than males. This group consists of the Blue Whale, the biggest animal species that has ever lived. Baleen whales have two blowholes, inflicting a V-shaped blow whereas toothed whales have a single blowhole.

Toothed Whales[edit]

The toothed whales have enamel as a result of they feed on creatures a lot bigger than krill, reminiscent of squid, fish seals and even different whales. These whales are the dolphins and porpoises, the killer whale and the large sperm whale.

Dolphins and porpoises primarily feed on fish and will hunt in teams known as pods.

Killer whales eat seals, fish, dolphins and even blue whales. They’re known as the Wolves of the Sea.

The sperm whale is the biggest toothed whale. It would eat fish and octopus however its favorite meals is large squid that reside within the deep ocean. A sperm whale has been recognized to dive to 3200 meters on the lookout for squid.

3. In what means have Whales and Dolphins been a profit to man?[edit]

In some cultures, whales present meat for each pets and for people. Whales additionally present oil for gas, perfumes, and different merchandise. Whole communities had been established dedicated to whaling. Though whaling is now unlawful in most elements of the world, whales proceed to offer advantages to man. They’re a significant vacationer attraction in areas the place they’re frequent, and a complete business has sprung as much as carry individuals to see the whales.

There are lots of tales of dolphins defending shipwrecked sailors towards sharks by swimming circles across the swimmers. Due to their excessive capability for studying, dolphins have been employed by people for any variety of functions. Dolphins educated to carry out in entrance of an viewers have develop into a favourite attraction at many aquariums, for instance SeaWorld. Such locations might generally additionally present a chance for people to work together very carefully with Dolphins. Dolphin/Human interplay can be employed in a healing sense at locations the place dolphins work with autistic or in any other case disabled youngsters. The navy has employed dolphins for varied functions from discovering mines to rescuing misplaced or trapped individuals.

4. Clarify how it’s {that a} Whale which breeds within the heat waters of the tropics may survive the ice chilly water of the Antarctica the place they go to feed, (contemplating the whale is a heat blooded mammal like people).[edit]

Whales have a really thick layer of fats beneath their pores and skin known as blubber. Blubber is a really efficient insulator, very similar to a moist go well with which is used for protecting divers heat after they swim in chilly waters. Blubber is much simpler than a moist go well with as a result of it’s so thick. In truth, blubber can comprise as much as 50% of the physique mass of some cetaceans throughout some factors of their lives. Blubber additionally serves as a supply of power, and whales metabolize (burn) fats to generate warmth internally and thus heat themselves. Folks metabolize fats too after they shiver (shivering serves the identical objective – to heat us up).

5. Memorize the next Scriptures regarding whales[edit]

Genesis 1:21 (NIV)

So God created the nice creatures of the ocean and each residing and shifting factor with which the water teems, in accordance with their sorts, and each winged chook in accordance with its variety. And God noticed that it was good.

Ezekiel 32:2 (NIV)

Son of man, take up a lament regarding Pharaoh king of Egypt and say to him:

” ‘You’re like a lion among the many nations;
you might be like a monster within the seas
thrashing about in your streams,
churning the water along with your toes
and muddying the streams.
Job 7:12 (NIV)

Am I the ocean, or the monster of the deep,

that you simply put me beneath guard?
Matthew 12:40 (NIV)

For as Jonah was three days and three nights within the stomach of an enormous fish, so the Son of Man shall be three days and three nights within the coronary heart of the earth.

6. Write and skim to a gaggle, or inform from reminiscence, the story of Jonah.[edit]

In case you are instructing this honor to your unit, you possibly can have them retell the story (and act it out) for worship at a campout or at an everyday assembly. It’s also possible to have your Pathfinders inform the story throughout common church service in case your church has a time allotted for “Youngsters’s Story”. Alternately, you possibly can have them write it out and skim it again to you (or to the group).

7. Efficiently draw a Baleen Whale and determine the place the next physique elements are[edit]

Baleen parts.png

a. Baleen Plates
These are the “strainers” in a baleen whale’s mouth.
b. Blowhole
A cetacean breaths by way of this little gap within the prime of its head.
c. Dorsal Fin
The fin on the highest of many cetaceans.
d. Ear
These are onerous to see as a result of they’re so small, however cetaceans all have them on the perimeters of their heads.
e. Eye
The higher to see you with!
f. Throat Pleats
These are the folds in a baleen whale’s throat and permit the whale’s throat to develop when it fills its mouth with water to filter its meals by way of its baleen.
g. Flukes
The tail.
h. Flippers
The fins on the aspect.
i. Genital Slit
The reproductive organ of a feminine cetacean.
j. Median Notch
The notch in the midst of the trailing fringe of the fluke.
ok. Peduncle
The a part of the physique to which the fluke is connected.

8. Be capable of determine at the very least fifteen Cetaceans.[edit]

References[edit]

Wikipedia articles

Different references

This honor is similar to Marine Mammals. Why not train them each on the identical time?


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