Reproduction in Animals





My Class 8th Science Notes: Reproduction in Animals

These are my complete classroom notes from the Chapter on Reproduction in Animals (Class 8 Science). Handwritten during lectures, with clear explanations and diagrams.

What’s covered:

- Asexual reproduction (binary fission, budding, fragmentation, spore formation)

- Sexual reproduction (male/female reproductive organs, fertilization)

- Types of fertilization (external like frog/fish, internal like humans/birds)

- Development stages (zygote → embryo → foetus)

- Viviparous vs oviparous animals

- Key diagrams and exam questions


Great for JKBOSE|CBSE|ICSE exam revision or homework help. Download the PDF below!

https://drive.google.com/file/d/14IoUq0FQg5InZ6tovaZ_c7VCEbJzGTiQ/

view?usp=drivesdk







Exercises 

1. Explain the importance of reproduction in organisms.


Reproduction is important because it ensures the continuation of a species from one generation to the next. Without reproduction, living organisms would not be able to produce offspring, and species would eventually become extinct.



2. Describe the process of fertilisation in human beings.


Fertilisation in humans is the fusion of a male gamete (sperm) with a female gamete (ovum or egg). It occurs inside the oviduct (fallopian tube). When sperm reach the egg, one sperm fuses with the egg, merging their nuclei to form a single-celled zygote. This process is called internal fertilisation.



3. Choose the most appropriate answer:


(a) (i) in female body.

(b) (ii) metamorphosis

(c) (ii) one




4. Indicate whether the following statements are True (T) or False (F).


(a) F – Oviparous animals lay eggs, they do not give birth.

(b) T – Each sperm is a single cell.

(c) T – External fertilisation takes place in frogs.

(d) F – A new human develops from a zygote, not a gamete.

(e) T – The fertilised egg (zygote) is a single cell.

(f) F – Amoeba reproduces by binary fission, not budding.

(g) F – Fertilisation is not required in asexual reproduction.

(h) T – Binary fission is a method of asexual reproduction.

(i) T – A zygote is formed as a result of fertilisation.

(j) F – An embryo is made up of many cells, not a single cell.



5. Give two differences between a zygote and a foetus.





6. Define asexual reproduction. Describe two methods of asexual reproduction in animals.


Asexual reproduction is a mode of reproduction in which only one parent is involved, and offspring are genetically identical to the parent.

Two methods:


1. Budding – Seen in Hydra, where a bud (outgrowth) develops on the parent body and grows into a new individual.

2. Binary fission – Seen in Amoeba, where the parent cell divides into two identical daughter cells.



7. In which female reproductive organ does the embryo get embedded?


The embryo gets embedded in the wall of the uterus.



8. What is metamorphosis? Give examples.


Metamorphosis is the transformation of a larva into an adult through drastic changes.

Example:


· Frog: Egg → Tadpole (larva) → Adult frog

· Butterfly: Egg → Caterpillar → Pupa → Adult butterfly


9. Differentiate between internal fertilisation and external fertilisation.





10. Complete the crossword puzzle.


Across:


1. Fertilisation

2. Internal

3. Buds

4. Ovary


Down:


1. Testes

2. IVF

3. Oviparous

4. Binary



I am a dynamic research student, dedicated to mentoring numerous students for competitive exams. My achievements include qualifying in various prestigious exams such as IIT-JAM, CUET, NTSE, EF-SET, and SAT, alongside holding degrees in Physics, Nuclear Engineering, Psychology, and Spectroscopy. With training from esteemed institutions like ISRO and UNICEF, I have also amassed over 150 certifications from top universities like Yale, Stanford, and Microsoft.Beyond my academic and technical prowess, I excel in AI and digital marketing, proficient in AI skills, Python, R, and more. Moreover, I bring a wealth of experience in leadership, communication, problem-solving, and project management, contributing to my well-rounded and accomplished professional profile.

Comments

Post a Comment

Popular posts from this blog

A Photograph

Image
  A Photograph                                                         Shirley Toulson The cardboard shows me how it was When the two girl cousins went paddling, Each one holding one of my mother’s hands, And she the big girl — some twelve years or so. All three stood still to smile through their hair At the uncle with the camera. A sweet face, My mother’s, that was before I was born. And the sea, which appears to have changed less, Washed their terribly transient feet. Some twenty — thirty — years later She’d laugh at the snapshot. “See Betty And Dolly,” she’d say, “and look how they Dressed us for the beach.” The sea holiday Was her past, mine is her laughter. Both wry With the laboured ease of loss. Now she’s been dead nearly as many years As that girl lived. And of this circumstance There is nothing to say at all. Its silence silences. Abou...
Read more

The Last Lesson

Image
 The Last Lesson (Alphonse Daudet) Alphonse Daudet is pronounced roughly as "Al-fon DOH-day," with the French "Alphonse" having a nasal sound (like "Al-fons") and "Daudet" sounding like the English word "do" followed by a soft "day," with the 't' usually silent in French, though Anglicized versions might pronounce the 't' About the Author  Alphonse Daudet (1840–1897) was a French novelist and short-story writer. The Last Lesson is set in the days of the Franco-Prussian War (1870–1871), in which France was defeated by Prussia. The story depicts the impact of the war on the French regions of Alsace and Lorraine, which fell under Prussian control. Early Life: · Born on May 13, 1840, in Nîmes, France. · His family faced financial difficulties, and he left school early to work as a teacher. Career and Writings: · Daudet moved to Paris in 1857 to pursue a literary career. · He gained recognition for his vivid, emotio...
Read more

Beauty

Image
Beauty- John Edward Masefield About the Author Having lived a life of both profound hardship and celebrated artistry, John Masefield (1878-1967) became one of England’s most cherished and accessible poets. His story reads like one of his own adventure tales. Orphaned as a boy, he was sent to sea at 13, a brutal apprenticeship that gifted him the nautical language and yearning for the horizon that would make him famous. He famously deserted his ship in New York, living a hand-to-mouth existence while educating himself in public libraries—an experience that grounded his later work in the realities of struggle. He returned to England determined to write, and his deep, resonant voice, which spoke of salt spray and the human spirit, eventually earned him the highest poetic honor: he was appointed Poet Laureate in 1930, a role he served with dedication for 37 years. Masefield’s genius lay in his ability to speak to both the common reader and the literary critic. He is best remembered for a h...
Read more