REPRODUCTION IN ORGANISM - INTRODUCTION

STD-12                 

UNIT-6-REPRODUCTION 

1) Reproduction in organism

2) Sexual reproduction in flowering plant

3) Human reproduction

4) Reproductive health

CHA-1

REPRODUCTION IN ORGANISMS 

INTRODUCTION 

• REPRODUCTION - reproduction one of the fundamental characteristics of living organism it involves the formation of young ones by the grown up of individuals

• LIFE SPAN - it is the period from birth to the Natural death of an organism is called as the lifespan

• Life span of an organism usually includs four stages
• BIRTH 
• JUVENILITY
• REPRODUCTIVE 
• AGEING/ SENESCENCE
• DEATH

Sexual Reproduction

• It occurs almost in all types of animals and mostly in higher plants.
•  It is usually biparental. 
• Gametes are always formed.
• Fertilization takes place. 
• It involves both meiosis and mitosis.
• Young ones differ genetically from the parents. 
• Multiplication is not so rapid 
• Since there are variations, so it contributes to evolution of the species.

• Asexual Reproduction 

• It occurs in lower invertebrates and plants with simple organisations. 
• It is always uniparental. 
• Gametes are not formed. 
• No fertilization. 
• It involves only mitosis. 
• Young ones are genetically identical to the parent. 
• Multiplication occurs rapidly. 
• Since there is no variation, so it does not contribute to evolution of the species.

 Mail-  indiabiologymanishmevada@gmail.com

Manish Mevada

M.Sc, M.Phil, B.ED