Animals (Term 3 Chapter 2 | 5th Science)
I. Choose the correct answer.
1. Fission is a way of _____________ reproduction
Answer: a. asexual
2.____________ is an oviparous animal.
Answer: d. Duck
3. Endangered animals are protected in ____________
Answer: d. sanctuary
4. Mundanthurai sanctuary is located in ____________ district.
Answer: c. Thirunelveli
5. The vision of Blue Cross is ___________ animals.
Answer: c. saving
II. Fill in the blanks.
1. Animals which give birth to young ones directly are named as viviparous animals.
2. Hunting of animals leads to endangered condition.
3. Gir National Park is famous for Asiatic lions.
4. Blue Cross is an animal welfare organization.
5. Nilgiri Tahr is an endangered species.
III. Match the following.
1. Zycote - Asexual Reproduction
2. Viviparous - Elephant
3. Endangered animal - Cat
4. Mudhumalai - Fertilised Egg
5. Fragmentation - Rhinoceros
1. Zygote - Fertilized Egg
2. Viviparous - Cat
3. Endangered animal - Rhinoceros
4. Mudhumalai - Elephant
5. Fragmentation - Asexual Reproduction
IV. Answer in brief.
1. What is fertilization?
When the male gamete reaches the female gamete they begin to fuse together. The fusion of gametes is known as fertilization.
2. What are the different stages of sexual reproduction?
Sexual reproduction consists of the following stages.
a. Pre -fertilization b. Fertilization c. Post-fertilization
3. Mention the different types of asexual reproduction.
Fission, Budding, Fragmentation and Spores are the different types of asexual reproduction.
4. Differentiate between oviparous and viviparous animals.
The development of the embryo takes place outside the animal.
They produce their young ones by laying eggs.
The embryo receives the nutrients from the egg yolk.
Examples for oviparous animals are insects, fish, reptiles and birds
The development of the embryo takes place inside the animal.
They directly give birth to the young ones.
The embryo receives the nutrients from the mother.
Examples for viviparous animals are cats, dogs, humans and lions.
5. Write a note on Blue Cross.
Blue Cross is a registered animal welfare charity in the United Kingdom. It was established in 1897 with the vision that every pet will enjoy a healthy life in a happy home. The charity provides support for pet owners who cannot afford private veterinary treatment, helps to find homes for unwanted animals and educates the public in the responsibilities of animal ownership.
V. Answer in detail.
1. Explain the methods of asexual reproduction.
Fission: Fission occurs in some invertebrate (organisms without backbone), multi-celled organisms. In this method, an organisms splits itself into two parts. For example, flat worms, sea anemones and sea cucumbers divide into two halves and regenerate the other half in each of the resulting individuals.
Budding : Budding is a form of asexual reproduction that results form the outgrowth of a part of the body. Then the bud is separated from the original organism forming two individuals. Budding occurs commonly in some invertebrate animals such as hydras and corals.
Fragmentation : Fragmentation is the breaking of an individual into parts followed by regeneration. Reproduction through fragmentation is observed in sponges and sea stars. Fragmentation may occur through accidental damage, damage from predators, or as a natural form of reproduction.
Spores : Some protozoan, bacteria, plants and fungi reproduce via spores. Spores are the structures naturally grown as part of an organism's life cycle. They are separated from the organism and dispersed through a medium such as air or water. In a suitable environment, the spores will develop into a fully grown organism.
2. What are the causes for the extinction of animals?
The following are the reasons why an animal or a plant becomes endangered or extinct.
❖ Forests which provide food and shelter to animals are destroyed for human needs.
❖ Large number of animals is hunted for their horns, skin, teeth and many other valuable products.
❖ Pollution like air pollution and water pollution affect the animals.
❖ Sometimes animals are taken to new habitat by people. They cannot survive there.
❖ Pesticides and chemicals which are used to get rid of insects, pests or weeds, poison the plants and animals.
❖ Natural disasters like food, cyclones and fire also destroy animals.
3. Write an essay about national parks and wildlife sanctuaries.
A National Park is an area which is strictly reserved for the betterment of the wild life. In these areas, activities like forestry, grazing or cultivation are not permitted. Even private ownership rights are not allowed in these areas. The national parks cover an area of 100-500 square kilometres.
Jim Corbett National Park : Jim Corbett National Park is located close to Nainital, in Uttarakhand. Tigers are found in this park.
Gir Forest National Park : It is located in Gujarat. Asiatic lions in their natural habitat can be seen here.
Kaziranga National Park : It is in Assam. Wild animals such as Rhinoceros, Tiger, Elephant, Wild buffalo and Swamp Deer are seen here.
Sundarban National Park: Located in West Bengal, the Sundarban National Park is a Tiger and Biosphere Reserve on the Ganges Delta.
Kanha National Park: Kanha National Park located in Madhya pradesh was established as a part of Project Tiger. .
Periyar National Park : Periyar National Park is in Thekkady, Kerala. Various species including the majestic elephants, royal tigers and fishes, reptiles and birds can be seen here.
Guindy National Park : This park is located at the heart of the Chennai city. It is a home to spotted deer, black bucks, white bucks, river otter, hyena, bonnet monkey, civet cat, jackals, pangolin, hedgehog and common mongoose etc.
A Sanctuary is a protected area which is reserved for the conservation of animals only. Harvesting of timber, collection of forest products and private ownership rights are allowed here. Tourist visit is also allowed in these places.
Kalakkad Wildlife Sanctuary : The Kalakad wildlife sanctuary in Thirunelveli district is famous for Tigers.
Mudumalai Wildlife Sanctuary : It is located in Ooty. Bengal Tiger, Giant Elephant and Leopard are found here. Elephant safari is famous in this sanctuary.
Mundanthurai Wildlife Sanctuary : It is located in Thirunelveli District. Major wild life animal found here is Tiger.
Anaimalai Wildlife Sanctuary: It is also called as Indira Gandhi wildlife sanctuary. It is situated in Coimbatore District. Dhole, Wild dog and Giant Squirrel are seen here.
Vedanthangal Bird Sanctuary: It is a very old sanctuary in Tamil Nadu. It is located in Kancheepuram District. It has many migratory birds like Spoon bills, Open billed storks, Pelicans etc.
Advantages of conservation:
❖ Species can be adapted to their habitat.
❖ Species can interact with each other.
❖ Natural habitat of the animals is maintained.
❖ It is less expensive and easy to manage.
Write down the names of any three oviparous and viviparous animals in the table given below.
Visit a nearby museum or a higher secondary school lab in your area. Find the specimens of starfish, cucumber and hydra there. Collect the pictures of these species and prepare an album.
Collect the pictures of different plants and animals. Prepare a poster showing the endangered animals and plants in India. Also find out where they are found.
Write few slogans for conservation of forest and animals. Observe some important days related to nature like World Wildlife Day and organise a rally on those days.
Plant native trees like Banyan Tree, Neem Tree, Umbrella Tree and Java Plum Tree in your school area. These trees can benefit birds.
List out the national parks and wild life santuaries in Tamil Nadu. Visit such places that are close to you and collect more information about the animlas found there.
Make a visit to a veterinary clinic near your area. Find how animals are affected by people. Discuss how you can prevent cruelty to animals.