5
Question Question 5
Stamen and Pistil
| Sl. No. | Stamen | Pistil |
|---|---|---|
| 1. | Stamen is the male part of flower. | Pistil is the female part of flower. |
| 2. | Stamen consists of anther and filament. | Pistil consists of Stigma, Style and ovary. |
| 3. | Stamen releases pollen grains. | The stigma in pistil receives the pollen grains. |
BRIGHT TUTORIALS
BRIGHT TUTORIALS
ICSE Class VIII | Academic Year 2026-2027
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Biology | Chapter 5: Reproduction in AnimalsWeb Content
Reproduction in Animals – Interactive Study Guide
Quick Overview
Reproduction ensures the continuation of species. Animals reproduce sexually (fusion of gametes) or asexually (single parent, no gametes). This chapter also covers embryo development and cloning.
Sexual vs Asexual Reproduction
| Feature | Sexual | Asexual |
|---|---|---|
| Parents | Two (male + female) | One |
| Gametes | Required (sperm + egg) | Not required |
| Offspring | Genetically different (variation) | Genetically identical (clones) |
| Examples | Humans, frogs, birds | Amoeba, Hydra, yeast |
Fertilisation Types
Internal
Inside female body. Fewer eggs, better protection. Examples: humans, birds, dogs.
External
Outside body (in water). Many eggs, lower survival. Examples: frogs, fish, starfish.
Development Sequence
Zygote → Embryo → Foetus → Baby
Zygote (1 cell) divides → Embryo (ball of cells, implants in uterus) → Foetus (recognisable body parts) → Birth (~9 months in humans)
Nutrition via placenta through umbilical cord.
Asexual Reproduction Types
Summary
- Budding: Bud grows from parent → detaches (Hydra, yeast)
- Binary fission: Parent splits into 2 equal parts (Amoeba, bacteria)
- Fragmentation: Body breaks into fragments, each grows (Planaria, starfish)
Cloning: Dolly the Sheep
Key Facts
First cloned mammal (1996). Ian Wilmut, Roslin Institute, Scotland. Nucleus from donor cell → enucleated egg → embryo → surrogate mother → Dolly (genetic copy of donor).
Self-Test Questions
Test Yourself
- What is the difference between internal and external fertilisation?
- Differentiate between viviparous and oviparous animals with examples.
- Describe binary fission in Amoeba.
- What is IVF? Why is it called "test-tube baby"?
- How was Dolly the sheep cloned?