Class 4th Chapter 4: Reproduction in Animals
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| prem sir |
1. Reproduction — (री-प्रोडक्शन) — प्रजनन
Definition (English): The process by which living organisms produce more of their own kind is called reproduction.
Example (English): Birds lay eggs and humans give birth to babies.
परिभाषा (Hindi): वह प्रक्रिया जिसके द्वारा जीव अपने जैसे और जीव उत्पन्न करते हैं, प्रजनन कहलाती है।
उदाहरण (Hindi): पक्षी अंडे देते हैं और मनुष्य बच्चों को जन्म देते हैं।
2. Lifespan — (लाइफ-स्पैन) — जीवनकाल
Definition (English): The period of time for which a living organism lives is called lifespan.
Example (English): Human lifespan is about 70–80 years.
परिभाषा (Hindi): किसी जीव के जीवित रहने की अवधि को जीवनकाल कहते हैं।
उदाहरण (Hindi): मनुष्य का जीवनकाल लगभग 70–80 वर्ष होता है।
3. Incubation — (इन-क्यू-बेशन) — अंडों को सेना
Definition (English): The process in which birds sit on eggs to keep them warm is called incubation.
Example (English): A hen sits on eggs.
परिभाषा (Hindi): पक्षियों द्वारा अंडों पर बैठकर उन्हें गर्म रखने की प्रक्रिया ऊष्मायन कहलाती है।
उदाहरण (Hindi): मुर्गी अंडों पर बैठती है।
4. Embryo — (एम-ब्रियो) — भ्रूण
Definition (English): A growing baby inside the egg is called embryo.
Example (English): A chick grows inside an egg.
परिभाषा (Hindi): अंडे के अंदर बढ़ रहे बच्चे को भ्रूण कहते हैं।
उदाहरण (Hindi): अंडे के अंदर चूजा विकसित होता है।
5. Yolk — (योक) — जर्दी
Definition (English): The yellow part present in the centre of an egg is called yolk.
Example (English): Yolk provides food to embryo.
परिभाषा (Hindi): अंडे के बीच का पीला भाग जर्दी कहलाता है।
उदाहरण (Hindi): जर्दी भ्रूण को भोजन देती है।
6. Albumen — (अल-ब्यू-मिन) — अंडे का सफेद भाग
Definition (English): The white watery part around the yolk is called albumen.
Example (English): Albumen protects the embryo.
परिभाषा (Hindi): जर्दी के चारों ओर सफेद भाग एल्ब्यूमेन कहलाता है।
उदाहरण (Hindi): एल्ब्यूमेन भ्रूण की रक्षा करता है।
7. Hatching — (हैचिंग) — अंडे से बाहर निकलना
Definition (English): The process in which a baby bird breaks the egg shell and comes out is called hatching.
Example (English): Chick comes out of egg.
परिभाषा (Hindi): जब बच्चा अंडे का खोल तोड़कर बाहर आता है, उसे हैचिंग कहते हैं।
उदाहरण (Hindi): चूजा अंडे से बाहर निकलता है।
8. Tadpole — (टैड-पोल) — मेंढक का बच्चा
Definition (English): The young one of a frog is called tadpole.
Example (English): Tadpoles live in water.
परिभाषा (Hindi): मेंढक के बच्चे को टैडपोल कहते हैं।
उदाहरण (Hindi): टैडपोल पानी में रहता है।
9. Metamorphosis — (मेटा-मॉर्फोसिस) — कायांतरण
Definition (English): The complete change from young stage to adult stage is called metamorphosis.
Example (English): Frog undergoes metamorphosis.
परिभाषा (Hindi): बच्चे से वयस्क बनने तक के पूर्ण परिवर्तन को कायांतरण कहते हैं।
उदाहरण (Hindi): मेंढक कायांतरण से गुजरता है।
10. Caterpillar — (कैटर-पिलर) — इल्ली
Definition (English): The larva of a butterfly is called caterpillar.
Example (English): Caterpillar eats leaves.
परिभाषा (Hindi): तितली के लार्वा को इल्ली कहते हैं।
उदाहरण (Hindi): इल्ली पत्तियाँ खाती है।
11. Pupa — (प्यूपा) — प्यूपा अवस्था
Definition (English): The stage after larva is called pupa.
Example (English): Butterfly develops in pupa stage.
परिभाषा (Hindi): लार्वा के बाद की अवस्था प्यूपा कहलाती है।
उदाहरण (Hindi): तितली प्यूपा अवस्था में विकसित होती है।
12. Cocoon — (ककून) — कोया
Definition (English): A thread-like covering made by caterpillar is called cocoon.
Example (English): Caterpillar stays inside cocoon.
परिभाषा (Hindi): इल्ली द्वारा बनाया गया धागेनुमा आवरण कोया कहलाता है।
उदाहरण (Hindi): इल्ली कोये के अंदर रहती है।
13. Maggot — (मैगट) — मक्खी का लार्वा
Definition (English): The larva of housefly is called maggot.
Example (English): Maggot changes into pupa.
परिभाषा (Hindi): घर की मक्खी के लार्वा को मैगट कहते हैं।
उदाहरण (Hindi): मैगट प्यूपा में बदल जाता है।
14. Mammals — (मैमल्स) — स्तनधारी जीव
Definition (English): Animals that give birth to young ones are called mammals.
Example (English): Cow, dog and humans are mammals.
परिभाषा (Hindi): जो जानवर बच्चों को जन्म देते हैं, उन्हें स्तनधारी कहते हैं।
उदाहरण (Hindi): गाय, कुत्ता और मनुष्य स्तनधारी हैं।
15. Marsupials — (मार्सुपियल्स) — थैलीधारी जीव
Definition (English): Animals that carry their young ones in a pouch are called marsupials.
Example (English): Kangaroo is a marsupial.
परिभाषा (Hindi): जो जानवर अपने बच्चों को थैली में रखते हैं, उन्हें थैलीधारी जीव कहते हैं।
उदाहरण (Hindi): कंगारू एक थैलीधारी जीव है।
-------------------We hope you do well on your Exam .Best of Luck !----------------------------
--------------------------PREM SIR - STUDY KUNJI ------------------------------------
Chapter 4: Reproduction in Animals
25 Subjective Questions with Answers
1. What is reproduction?
Answer: Reproduction is the process by which living organisms produce more of their own kind.
2. Why is reproduction important?
Answer: Reproduction is important for the continuity of species and to maintain the population of living organisms.
3. What is lifespan?
Answer: Lifespan is the period of time for which a living organism lives.
4. Name the two ways by which animals reproduce.
Answer:
By laying eggs
By giving birth to young ones
5. What are oviparous animals? Give examples.
Answer: Animals that lay eggs are called oviparous animals.
Examples: Hen, fish, frog, snake.
6. What are viviparous animals? Give examples.
Answer: Animals that give birth to young ones are called viviparous animals.
Examples: Cow, dog, cat, humans.
7. Where do birds lay eggs?
Answer: Birds lay eggs in nests.
8. What is incubation?
Answer: The process in which birds sit on eggs to keep them warm is called incubation.
9. What is hatching?
Answer: The process in which a baby bird breaks the egg shell and comes out is called hatching.
10. Name the parts of an egg.
Answer:
Shell
Albumen
Yolk
Embryo
11. What is yolk?
Answer: Yolk is the yellow part of the egg that provides food to the embryo.
12. What is albumen?
Answer: Albumen is the white watery part of the egg that protects the embryo.
13. What is an embryo?
Answer: The developing baby inside the egg is called an embryo.
14. Where do frogs lay eggs?
Answer: Frogs lay eggs in water.
15. What are frog eggs called?
Answer: Frog eggs are called spawn.
16. What is a tadpole?
Answer: The young one of a frog is called a tadpole.
17. What is metamorphosis?
Answer: The complete transformation from young stage to adult stage is called metamorphosis.
18. Explain the life cycle of a frog.
Answer:
Egg → Tadpole → Young Frog → Adult Frog
19. What is the larva of a butterfly called?
Answer: The larva of a butterfly is called caterpillar.
20. What is a pupa?
Answer: The stage after larva in the life cycle of insects is called pupa.
21. What is cocoon?
Answer: Cocoon is a protective covering made by caterpillar around itself.
22. Explain the life cycle of butterfly.
Answer:
Egg → Larva (Caterpillar) → Pupa → Adult Butterfly
23. What are marsupials?
Answer: Animals that carry their young ones in a pouch are called marsupials.
24. Give an example of a marsupial animal.
Answer: Kangaroo is a marsupial animal.
25. What is a joey?
Answer: A baby kangaroo is called a joey.
-------------------We hope you do well on your Exam .Best of Luck !----------------------------
--------------------------PREM SIR - STUDY KUNJI ------------------------------------
Class 4th - Chapter 4: Reproduction in Animals
Exercise Answers Your SCHOOL BOOK
A. Tick (✓) the correct answer
1. The period of time for which a living being lives is called its ______.
a) life cycle
b) lifespan ✓
c) duration
d) cycle
2. The white part of an egg is called ______.
a) egg shell
b) embryo
c) albumen ✓
d) yolk
3. The larva of a housefly is called ______.
a) maggot ✓
b) nymph
c) spawn
d) tadpole
4. Change in the form of an organism from young stage to adult stage is called ______.
a) life cycle
b) lifespan
c) metamorphosis ✓
d) moulting
5. Which of the following animals gives birth to young ones?
a) Frog
b) Fish
c) Cat ✓
d) Butterfly
B. Fill in the blanks using the words given in the box
Words: incubate, nourishment, nymph, marsupials, spawns
1. Animals that carry their young ones in their pouch are called marsupials.
2. An egg of a cockroach transforms into a form called nymph.
3. The clusters of eggs laid by female frogs are called spawns.
4. Birds sit on their eggs to incubate them.
5. The yolk in the egg provides nourishment to the growing chick.
C. State True or False
1. Most insects build nests to lay their eggs.
False
2. The white watery substance present in an egg is called albumen.
True
3. A tadpole is the young one of a snake.
False
4. Fish lay their eggs on land.
False
5. There are three stages in the life cycle of a cockroach.
True
D. Identify the animals given below on the basis of their way of reproduction
Lay eggs:
Lizard
Turtle
Fish
Cockroach
Give birth to young ones:
Camel
Cat
Cheetah
Elephant
E. Answer the following questions in brief
1. Why do animals reproduce?
Answer: Animals reproduce to produce more of their own kind and ensure continuity of life.
2. Why do birds build their nests?
Answer: Birds build nests to lay eggs safely and protect their babies.
3. What do you understand by incubation?
Answer: Incubation is the process in which birds sit on their eggs to keep them warm until they hatch.
E. Answer the following questions in brief
4. State the function of the following parts of an egg:
a) Albumen
Answer: Albumen protects the embryo from shocks and provides water to it.
b) Yolk
Answer: Yolk provides food/nourishment to the developing embryo.
c) Egg shell
Answer: Egg shell protects the egg from damage.
5. What is metamorphosis?
Answer: Metamorphosis is the complete transformation of an organism from young stage to adult stage.
6. Define life cycle and moulting.
Life cycle
Answer: The sequence of development from embryo to adult stage is called life cycle.
Moulting
Answer: The process of shedding old skin is called moulting.
7. Describe one similarity between sea horse and kangaroo.
Answer: Both sea horse and kangaroo carry their young ones in a pouch.
F. Answer the following questions in detail
1. Describe the life cycle of a butterfly.
Answer:
The life cycle of a butterfly has four stages:
Egg
Larva (Caterpillar)
Pupa
Adult Butterfly
The butterfly lays eggs on leaves. The eggs hatch into caterpillars. The caterpillar forms a cocoon and changes into pupa. Finally, an adult butterfly comes out.
2. What is the difference between the life cycle of a frog and a housefly?
Answer:
Frog:
Egg → Tadpole → Adult Frog
Housefly:
Egg → Larva (Maggot) → Pupa → Adult Housefly
Frog has three stages while housefly has four stages.
3. Kangaroos give birth to their babies, but they are called marsupials. Why?
Answer:
Kangaroos are called marsupials because they carry their young ones in a pouch.
4. How do mammals take care of their young ones after they are born?
Answer:
Mammals feed their babies, protect them, and take care of them until they become independent.
5. Where do crocodiles lay eggs? What do they do with their babies after hatching?
Answer:
Crocodiles lay eggs in shallow pits near river banks. After hatching, they carry their babies to water and take care of them.
6. Discuss the life cycle of a cockroach.
Answer:
The life cycle of a cockroach has three stages:
Egg
Nymph
Adult
The egg changes into a nymph. The nymph sheds its skin many times and becomes an adult.
7. Why does tadpole have gills instead of lungs to breathe?
Answer:
Tadpoles live in water, so they breathe through gills instead of lungs.
G. Higher Order Thinking Skills (HOTS)
1. How is the life cycle of a butterfly different from the life cycle of a cockroach or grasshopper?
Answer:
Butterfly has four stages:
Egg → Larva → Pupa → Adult
Cockroach/Grasshopper has three stages:
Egg → Nymph → Adult
Butterfly undergoes complete metamorphosis, while cockroach/grasshopper undergo incomplete metamorphosis.
2. Can tadpoles thrive in a chlorinated swimming pool?
Answer:
No, tadpoles cannot survive in a chlorinated swimming pool because chlorine is harmful to them.
H. Competency Based Questions
1. Why do birds build nests for their eggs?
Answer:
Birds build nests to keep their eggs safe and protect them.
2. How does the hard shell of an egg benefit the developing embryo?
Answer:
The hard shell protects the embryo from damage and outside dangers.
3. If your hen laid an egg but won’t sit on it, what would you do?
Answer:
I would keep the egg warm in a safe place or use an incubator so that the egg can develop properly.
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