Class 7 Science - ICSE-BIOLOGY
Reproduction
The chapter 'Reproduction' in Class 7 ICSE Biology introduces students to how living organisms produce more of their own kind to ensure the survival of their species. Students will explore the two main modes of reproduction: asexual reproduction, seen in lower organisms through processes like budding, fragmentation, and binary fission, and sexual reproduction, which involves the fusion of male and female gametes in plants and animals. Understanding flower structure, pollination, and fertilization is crucial, as these form the foundation for higher-grade biology topics and frequently appear in ICSE board exams through diagrams and direct definitions.
Start Learning FreeKey Concepts
Asexual Reproduction
A mode of reproduction involving a single parent, resulting in offspring that are exact genetic copies, or clones, of the parent.
Sexual Reproduction
A process that involves the fusion of a male gamete and a female gamete to form a zygote, bringing about genetic variations in offspring.
Pollination
The transfer of pollen grains from the anther to the stigma of a flower, which can occur through wind, water, insects, or birds.
Fertilization
The fusion of the male gamete present in the pollen grain with the female gamete (ovule) inside the ovary to form a zygote.
Seed Dispersal
The scattering of seeds away from the parent plant using agents like wind, water, animals, and explosive mechanisms to prevent overcrowding.
Important Formulas
Board Exam Info
In ICSE Biology examinations, this chapter typically carries around 8 to 12 marks. Common question types include diagram-based questions (such as labeling parts of a bisexual flower or types of asexual reproduction like budding in yeast), definitions of key terms, and distinguishing between self-pollination and cross-pollination.
Frequently Asked Questions
What is the main difference between asexual and sexual reproduction?
Asexual reproduction involves only one parent and produces identical offspring, whereas sexual reproduction involves two parents and the fusion of gametes, leading to variations in offspring.
How does budding take place in yeast?
In yeast, a small bulb-like projection called a bud grows on the parent cell, eventually detaches, and grows into a new independent yeast organism.
What happens to the flower parts after fertilization?
After fertilization, the sepals, petals, stamens, style, and stigma usually wither and fall off. The ovary develops into a fruit, and the ovules develop into seeds.
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