Tamilnadu State Board New Syllabus Samacheer Kalvi 5th Science Guide Pdf Term 3 Chapter 2 Animals Text Book Back Questions and Answers, Notes.

Tamilnadu Samacheer Kalvi 5th Science Solutions Term 3 Chapter 2 Animals

Samacheer Kalvi 5th Science Guide Animals Text Book Back Questions and Answers

Evaluation

I. Choose the correct answer:

Question 1.
Fission is a way of ______ reproduction
(a) sexual
(b) asexual
(c) viviparous
(d) oviparous
Answer:
(b) Asexual

Samacheer Kalvi 5th Science Guide Term 3 Chapter 2 Animals

Question 2.
______ is an oviparous animal.
(a) Cow
(b) Deer
(c) Goat
(d) Duck
Answer:
(d) Duck

Question 3.
Endangered animals are protected in ______.
(a) museums
(b) circus
(c) farm
(d) sanctuary
Answer:
(d) Sanctuary

Question 4.
Mundanthurai sanctuary is located in ______ district.
(a) Thiruppur
(b) Tiruvarur
(C) Thirunelveli
(d) Thiruvallur
Answer:
(c) Thirunelveli

Question 5.
The vision of Blue Cross is ______ animal.
(a) Hunting
(b) capturing
(c) saving
(d) neglecting
Answer:
(c) Saving

Samacheer Kalvi 5th Science Guide Term 3 Chapter 2 Animals

II. Fill in the blanks:

Question 1.
Animals which give birth to young ones directly are named as ______.
Answer:
Mammals

Question 2.
______ of animals leads to endangered condition.
Answer:
Hunting

Question 3.
Gir National Park is famous for ______.
Answer:
Asiatic Lions

Question 4.
Blue Cross is an ______ welfare organization.
Answer:
Animal

Question 5.
Nilgiri Tahr is an ______ species.
Answer:
Endangered

Samacheer Kalvi 5th Science Guide Term 3 Chapter 2 Animals

III. Match the following:

1. Zygote a. Asexual Reproduction
2. Viviparous b. Elephant
3. Endangered animal c. Cat
4. Mudhumalai d. Fertilised Egg
5. Fragmentation e. Rhinoceros

Answer:

1. Zygote a. Fertilised Egg
2. Viviparous b. Cat
3. Endangered Animal c. Rhinoceros
4. Mudhumalai d. Elephant
5. Fragmentation e. Asexual Reproduction

Samacheer Kalvi 5th Science Guide Term 3 Chapter 2 Animals

IV. Answer briefly:

Question 1.
What is fertilization?
Answer:
When the male gamete reaches the female gametes they begin to fuse together. The fusion of gametes is known as fertilization.

Question 2.
What are the different stages of sexual reproduction?
Answer:
Sexual reproduction consists of the following stages.

  • Pre-fertilization
  • Fertilization
  • Post-fertilization.

Question 3.
Mention the different types of asexual reproduction.
Answer:
Fission, Budding, Fragmentation, and Spores are the different types of asexual reproduction.

Question 4.
Differentiate between oviparous and viviparous animals.
Answer:

Oviparous animals Viviparous animals
The development of the embryo takes place outside the animal. The development of the embryo takes place inside the animal.
They produce their young ones by laying eggs. They directly give birth to the young ones.
The embryo receives the nutrients from the egg yolk. The embryo receives the nutrients from the mother.
Examples for oviparous animals are insects, fish, reptiles and birds. Examples for viviparous animals are cats, dogs, humans and lions.

Question 5.
Write anote on Blue Cross.
Answer:

  • 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.

Samacheer Kalvi 5th Science Guide Term 3 Chapter 2 Animals

V. Answer in detail:

Question 1.
Explain the methods of asexual reproduction.
Answer:
Fission :

  • Fission occurs in some invertebrate (organisms without backbone), multi-celled organisms.
  • In this method, an organism splits itself into two parts.
  • For example, flatworms, 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 from 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.

Question 2.
What are the causes of the extinction of animals?
Answer:

  • Forests are destroyed for human needs.
  • More animals are hunted for their horns, skin, teeth, and many other valuable products.
  • Pollutions like air pollution and water pollution affect the animals.
  • Sometimes animals are taken to new habitats by people. They cannot survive there.
  • Pesticides and chemicals are used to get rid of insects, pests, or weeds, poison the plants and animals.
  • Natural disasters like floods, cyclones, and fire also destroy animals.

Samacheer Kalvi 5th Science Guide Term 3 Chapter 2 Animals

Question 3.
Write an essay about National parks and wildlife sanctuaries.
Answer:
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.
Some Important National parks:

Jim Corbett National Park:

  • It is located close to Nainital, in Uttarakhand.
  • Tigers are found in this park.
  • Several species of deer, leopards, jackals, red foxes, black bears, sloth bears, and are also found.

Gir Forest National Park:

  • It is located in Gujarat.
  • Asiatic lions in their natural habitat can be seen here. Other animals sambar, chinkara, chital, porcupine, wild boar, and blackbuck can be seen here.

Kaziranga National Park:

  • Wild animals such as Rhinoceros, Tiger, Elephant, Wild Buffalo, and Swam are seen here.
  • Also has bears, leopards, and several species of local and migratory birds.
  • This park is famous for one-horned Rhino.

Sundarban National Park:

  • Located in West Bengal.
  • The Sundarban National Park is a Tiger and Biosphere Reserve on the Ganges
  • Bengal tiger, saltwater crocodile, wild boars, foxes, leopard cats, huge turtles, ( river dolphins, and several other varieties of mammals and reptiles, along with a variety of local and migratory birds can be seen here.

Kanha National Park:

  • Kanha National Park located in Madhya Pradesh was established as a part of Project Tiger.
  • Apart from tigers, animals such as elephants, jackals, leopards, striped hyenas, monkeys, and several varieties of deer including black buck, swamp deer, chital, and sambhar are seen here.

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 Chennai city.
  • It is home to spotted deer, blackbucks, white bucks, river otter, hyena, bonnet monkey, civet cat, jackals, pangolin, hedgehog and common mongoose, etc.

Wildlife Sanctuary:
Kalakkad Wildlife Sanctuary:

  • The Kalakkad wildlife sanctuary is famous for Tigers.
  • Lion-tailed macaque, Nilgiri langur, bonnet macaque, langur, Nilgiri tahr, sambar, sloth bear, gaur, elephant, flying squirrel, panther, wild dog, and pangolin are some of the animals found here.

Mudumalai Wildlife Sanctuary:

  • It is located in Ooty.
  • Bengal Tiger, Giant Elephant, and Leopard are found here.
  • Elephant safari is famous in this sanctuary.

Mundanthrai Wildlife Sanctuary:

  • It is located in Thirunelveli District.
  • The major wildlife animal found here is Tiger.

Samacheer Kalvi 5th Science Guide Term 3 Chapter 2 Animals

Activities:

Activity 1.
List out any three oviparous and viviparous animals in the table given below.
Answer:

Oviparous animals Viviparous animals
Insects Cats
Fish Dogs
Reptiles Lions
Human

Samacheer Kalvi 5th Science Guide Term 3 Chapter 2 Animals

Samacheer Kalvi 5th Science Guide Animals Additional Questions and Answers

I. Choose the correct answer:

Question 1.
______ is the biological process by which an organism gives rise to a new organism.
(a) Species
(b) Generation
(c) Reproduction
Answer:
(c) Reproduction

Question 2.
______ is the first stage of sexual reproduction.
(a) Fertilisation
(b) Pre-fertilisation
(c) Post-fertilisation
Answer:
(b) Pre-fertilisation

Question 3.
______ fertilisation takes place in frogs and fish.
(a) Internal
(b) External
(c) Post
Answer:
(b) External

Question 4.
The zygote divides repeatedly into a group of cells, which develops into different tissues and organs constituting a full body. This structure is known as ______.
(a) egg
(b) embryo
(c) zygote
Answer:
(b) Embryo

Question 5.
Animals in which an embryo develops outside the body are called ______ animals.
(a) oviparous
(b) viviparous
(c) oviparous
Answer:
(a) Oviparous

Question 6.
______ lay thousands and sometimes millions of small, soft eggs in water.
(a) Oviparous
(b) Amphibians
(c) Viviparous
Answer:
(b) Amphibians

Question 7.
The eggshell protects the ______ from the outer environment.
(a) embryo
(b) yolk
(c) larva
Answer:
(a) Embryo

Samacheer Kalvi 5th Science Guide Term 3 Chapter 2 Animals

II. Fill In the blanks:

Question 1.
________ are organisms without backbone
Answer:
Invertebrate

Question 2.
The type of reproduction in which only a singe parent, gets divided into two new offspring is known as ______.
Answer:
Asexual reproduction

Question 3.
________ is one of the asexual method of reproduction.
Answer:
Fission

Question 4.
In ______ animals, the development of the embryo takes place inside the body.
Answer:
viviparous

Question 5.
_________ is a form of asexual reproduction that results from the outgrowth of a part of the body.
Answer:
Budding

Question 6.
________ is the breaking of an individual into parts followed by regeneration.
Answer:
Fragmentation

Samacheer Kalvi 5th Science Guide Term 3 Chapter 2 Animals

III. Say True or False. If false, correct the statement:

Question 1.
Spores are the structures naturally grown as part of an organism’s life cycle.
Answer:
True

Question 2.
An animal is said to be endangered if its population is currently less than 50 or less than 2500 for the past three years
Answer:
False
Correct statement:
An animal is said to be endangered if its population is currently less than 50 or less than 250 for the past three years.

Question 3.
Biodiversity is the term used to describe different plants, animals, micro-organisms and insects, etc.
Answer:
True

Question 4.
Hunting and poaching animals should be encouraged.
Answer:
False
Correct statement:
Hunting and poaching animals should be prohibited.

Question 5.
Pesticides and chemicals used to get rid of insects, pests or weeds, poison the plants and animals.
Answer:
True

Samacheer Kalvi 5th Science Guide Term 3 Chapter 2 Animals

IV. Match the following:

1. Jim Corbett National park a. Thekkady
2. Periyar National park b. Kancheepuram
3. Guindy National park c. Coimbatore
4. Anaimalai Wildlife sanctuary d. Uttarkhand
5. Vedanthangal bird sanctuary e. Chennai

Answer:

  1. d
  2. a
  3. e
  4. c
  5. b

Samacheer Kalvi 5th Science Guide Term 3 Chapter 2 Animals

V. Answer briefly:

Question 1.
Name the two ways by which fertilisation in animals takes place.
Answer:
Fertilisation in animals takes place in two ways. They are: External fertilization and Internal fertilization

Question 2.
Explain the term reproduction.
Answer:

  • Reproduction is the biological process by which an organism gives rise to a new organism.
  • This process is seen in all living organisms – both plants and animals. Reproduction is essential for the continuation of similar kinds of species, generation after generation.
  • In animals, sexual and asexual reproduction are seen.

Question 3.
What is external fertilisation?
Answer:

  • External fertilization takes place outside the animal’s body.
  • It usually takes place in aquatic environments where both eggs and sperm are released into the water.
  • Fertilization in frogs and fish takes place by this method.

Question 4.
What are oviparous animals?
Answer:

  • Animals in which an embryo develops outside the body are called oviparous animals.
  • They produce their offspring by laying eggs. In the case of birds, new ones are produced from the eggs.
  • The egg shell protects the embryo from the outer environment and the embryo receives its nutrients from the egg yolk.

Question 5.
What is asexual reproduction?
Answer:

  • Only a single parent, gets divided into two new offspring, which is known as asexual reproduction.
  • It takes place in microorganisms like hydra and amoeba.
  • It produces offspring that are identical to the parent.

Samacheer Kalvi 5th Science Guide Term 3 Chapter 2 Animals

Question 6.
Name some endangered species in India
Answer:
Snow Leopard, Bengal Tiger, Asiatic Lion, Purple Frog, and Indian Giant Squirrel are some of the endangered animals in India.

Question 7.
How to save endangered species? (any 2 methods)
Answer:
We need to take some measures to protect the endangered species.

  1. Hunting and poaching animals should be prohibited.
  2. We should hot pollute the environment.

Question 8.
What is Red data book?
Answer:
The Red Data Book is a book maintained for recording rare and endangered species of animals and plants. This book is created to identify and protect the species which are about to extinct.

Question 9.
Expand IUCN.
Answer:
IUCN – International Union for Conservation of Nature.

Question 10.
What is meant by conservation?
Answer:

  • Conservation is the protection, preservation, management of wildlife, and natural resources.
  • Endangered species are maintained in certain protected areas such as national parks and wildlife sanctuaries.

Question 11.
Name the wild animals that are protected at Kaziranga National park.
Answer:

  • Wild animals such as Rhinoceros, Tiger, Elephant, Wild Buffalo, and Swamp Deer are seen here.
  • This park also has bears, leopards, and several species of local and migratory birds. This park is famous for one-horned Rhino.

Question 12.
Expand UNESCO.
Answer:
UNESCO (United Nations Educational, Scientific, and Cultural Organisation).

Question 13.
What is the advantage of conservation?
Answer:

  • Species can be adapted to their habitat.
  • Species can interact with each other.
  • The natural habitat of the animals is maintained.
  • It is less expensive and easy to manage.

Question 14.
What is meant by cruelty?
Answer:
Cruelty to animals includes capturing, trapping, poisoning of any wild animal collectively.

Question 15.
Name 2 government organizations which work for the welfare of animals.
Answer:

  1. Animal Welfare Board of India.
  2. National Institute of Animal Welfare

Samacheer Kalvi 5th Science Guide Term 3 Chapter 2 Animals

VI. Answer In detail:

Question 1.
Explain the two types of fertilisation.
Answer:
Fertilisation:
Fertilisation in animals takes place in two ways. They are: External fertilization and Internal fertilization
External fertilisation:

  • It takes place outside the animal’s body.
  • It usually takes place in aquatic environments where both eggs and sperm are released into the water.
    Fertilization in frogs and fish takes place by this method.

Internal fertilisation:

  • Fertilization takes place inside the. animal’s body.
  • Internal fertilization takes place in animals like cats, dogs, cows, etc.

Question 2.
Explain the formation of the embryo.
Answer:

  • The zygote (fertilized egg) further divides repeatedly into groups of cells.
  • These cells develop into different tissues and organs constituting a full body.
  • This structure is known as an embryo.
  • The embryo continues to develop in the uterus and it is developed into body parts such as the head, face, hands, legs, etc.
  • Based on the embryo develops outside or inside the body, animals are classified into oviparous and viviparous respectively.

Question 3.
How can we protect endangered species?
Answer:

  • Hunting and poaching animals should be prohibited.
  • We should not pollute the environment.
  • Limiting the usage of plastic and recycling can save endangered animals.
  • Pesticides and chemicals which pollute the environment should be avoided.
  • Planting native trees will provide food to the animals.
  • We should buy eco-friendly products only.

Samacheer Kalvi 5th Science Guide Term 3 Chapter 2 Animals

Question 4.
What are the advantages of the Red data book?
Answer:

  • It helps to evaluate the population of a particular species.
  • The data given in this book can be used at the global level.
  • The risk of a species becoming globally extinct can be estimated with the help of this book.
  • It provides the necessary guidelines for implementing protective measures.