1. Can human beings live like amphibians? What adaptation do we need to live under water?
2. When we go to visit a very cold place, we generally wear a warm jacket or a sweater to protect ourselves from the cold. Do you think it is an adaptation? Why or why not?
3. How is a camel different from a yak even though both are terrestrial animals?
4a. Why endangered animals need to be protected?
5a. Why does a frog lay its eggs in water?
4b. How can you distinguish between carnivores and scavengers?
5b. Explain how the teeth of herbivores, carnivores and omnivores are adapted to their feeding habits.
6. How are extinct animals different from endangered animals? Give examples of each.
Answers
1 . Instead, by passing the water through their specialized organs (called gills), they can remove the oxygen and eliminate waste gases. Since humans do not have gills, we cannot extract oxygen from water.
2 . All living organisms have the ability to adjust and adapt according to their surroundings.
Animals living in extremely cold climatic conditions have to protect themselves from the cold weather. So they have a thick layer of fur over them. As the layer of fur blocks the cold air and prevents it from reaching the animal's body, it will protect them against cold.
Similarly, a thick layer of fat over their body also causes insulation and protects the animal from extreme cold. So, both of these are adaptations against cold.
Most of the animals exhibit a period of inactivation, where they are in a state of dormancy. Hibernation is the state of inactivity in winter to avoid cold temperatures.
All these 3 options are characteristics of animals for adapting themselves against extreme cold.
A thin layer of hair over their bodies will not provide enough protection against environmental cold and so it is not a characteristic that protects them.
3 . The following are the differences between camel and yak:
The camel lives in the desert habitat whereas the yak lives in the cold regions or in mountains where weather remains cold. 2. The camel have thin fur to allow the loss of heat whereas the yak have thick fur over them to prevent heat loss.
4a . Biodiversity is vital for a healthy and functional ecosystem. The ecosystem is delicate. Extracting wildlife from its natural habitat inevitably leads to disastrous results. If a single species should become extinct, the whole food chain is disrupted – affecting all species.
5a . A frog's eggs do not do not have a hard protective shell like in case of birds and reptiles. Instead, the frog's eggs are covered with a glycoprotein, which helps to keep the eggs moist. ... Therefore, frog lays its eggs in water to prevent them from getting dried up.
4b . Carnivores and scavengers both feed on the flesh of other animals; however carnivores hunt their prey, whereas scavengers do not kill other animals. They feed on already dead animals.
5b . All animals have teeth that are adapted to eating certain types of food. Omnivores, because they eat both meat and plants, have a combination of sharp front teeth and molars for grinding. ... Herbivores have teeth that are highly specialized for eating plants.
6 . Extinct species are the organisms that have become extinct either in the wild or completely. An endangered species is a species of organisms facing a very high risk of extinction. They are living today but t heir number has decreased and may become extinct in future.
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