This document is a student's notes on the topic of reproduction from the class "The life cycle". It contains definitions of asexual and sexual reproduction, examples of modes of reproduction like binary fission and meiosis. It discusses the importance of variation in ensuring survival of species. Key terms mentioned include chemical reactions, DNA replication, variation, mitosis, meiosis, gametes, and examples like paramoecium.

1. • Name: Shaikh Yasmin Rashid Ahmed
• Date:-13/9/14
• Std:X
• School:Anjuman-I-Islam’s A.A.Khatkhatay English
secondary school
• Chp:The life cycle
• Topic:Reproduction and modes of reproduction
• Reference:
www.heathersanimation.com
www.google.com
www.youtube.com

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4. Reproduction
• All living organisms produce new individual of same species
That is a new, generation of species from an existing
individual

6. Chemical reactions

7. identical

8. Variation:the changes that occur during the
process of replication or formation of DNA
copy,these changes are known as variation.
Parent DNA Child DNA

9. Imagine the confusion when everybody arounds
you look same.
• Creates Diversity
IMPORTANCE OF VARIATION

10. • Survival of species

11. n
pairs
2n
2n
2n
2n
2n
Number of
chromosomes
Total number of
chromosomes
Total number of chromosomes in each
child
Parent cell
Daughter cell

12. Modes of Reproduction
• Body cells(somatic cells)
• Only one parent involved
2n
2n 2n
M
I
T
O
S
I
S
• Two parents involved
Sexual reproduction
• Reproductive cells(germ cells,
gametes
Asexual reproduction
n
n
M
E
I
O
S
I
S

13. 1)Binary fission(PARAMOECIUM)
ASEXUAL REPRODUCTION:

14. Binary fission in paramoecium.

15. Evaluation
A L T Y I K G M
S M Z G H P N K
E A O T O G I F
X L Y E A L D N
U E X J B K D K
A Q W D K A U D
L F V C V C B G
Unicellular animal
Clues:
One of the two sexes
Mode of reproduction
Reproduction without union of gametes
Type of asexual reproduction

16. Thank you