What are the two main types of reproduction in animals?

Sexual and asexual reproduction

How does fertilization occur in animals?

Sperm meets ovum to form a zygote

Significant changes from juvenile to adult stage

By dividing nucleus into two parts

Ensures gene transmission for species continuity

Sexual reproduction involves the fusion of male and female reproductive cells, leading to the creation of a zygote that develops into a new individual, showcasing the importance of genetic diversity and the continuation of species.
The process of metamorphosis, as seen in frogs, demonstrates significant physical changes from birth to adulthood, highlighting the diverse methods of reproduction and development between viviparous and oviparous animals, emphasizing the complexity and adaptability of life cycles.

What are the two main types of reproduction in animals?
Sexual and asexual reproduction
How does fertilization occur in animals?
Sperm meets ovum to form a zygote
What is the significance of metamorphosis in animals?
Significant changes from juvenile to adult stage
How do unicellular organisms like Amoeba reproduce?
By dividing nucleus into two parts
What is the role of reproduction in preventing species extinction?
Ensures gene transmission for species continuity

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Reproduction in animals is the focus after studying plant reproduction in class 7 science, with two main types: sexual and asexual reproduction.
Sexual reproduction involves male and female reproductive parts, leading to the formation of a zygote that develops into a new individual.
Male reproductive organs include testicles, sperm, and a long tube for sperm travel, while female reproductive organs develop the baby internally.
Fertilization occurs when the sperm meets the ovum, forming a zygote that develops traits from both parents.
External fertilization, like in frogs, occurs outside the female's body, while internal fertilization happens inside, leading to the development of offspring.
Embryo development involves the multiplication of cells, forming protective coverings, and eventually developing into a new individual.
Viviparous animals give birth to live young, while oviparous animals lay eggs for further development.
Metamorphosis, like in frogs, involves significant changes from tadpole to adult, showcasing the process of transformation.
Sexual reproduction involves two parents, while asexual reproduction, like in Hydra and Amoeba, only requires a single parent for offspring production.
Amoeba, a unicellular organism, reproduces by dividing its nucleus into two parts, leading to the formation of new individuals.

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Amoeba undergoes binary fission, dividing into two parts with one nucleus each, similar to the reproduction model in marriage.
The text discusses the binary digit system in computers, highlighting the concept of binary fission in sexual reproduction.
The importance of reproduction lies in gene transmission for the continuity of species, preventing extinction.
Fertilization in humans involves the fusion of male and female gametes, leading to the formation of a zygote through internal fertilization.
Metamorphosis is explained as a series of changes in the body structure, exemplified by the development of a frog from an egg to an adult, showcasing the difference between internal and external fertilization.