Life Processes class 10 solutions 2020

Chapter - 3.0

Life Process in Living Organisms Part – 1

Part - 1

Life Process:-

• Nutrition
• Respiration
• Excretion
• Sensation
• Response

Reproduction:-

Formation of new organisms of same species by earlier existing organisms is called as reproduction

 

Reproduction two methods:-

A ) Asexual Reproduction

B ) Sexual Reproduction

 

A ) Asexual Reproduction in unicellular organisms.

1       Binary fission:- Prokaryotes (bacteria), Protists ( Amoeba ) paramoecium, Euglena, etc. and eukaryotic cell organelle like mitochondria and chloroplast perform asexual reproduction by Binary fission.

• Simple Binary fission takes place in Amoeba because it divides in any plane due to lack of specific shape

• Paramoecium divides by transverse binary fission

• Euglena by longitudinal binary fission

2      Multiple fission:-

Asexual reproduction by multiple fission is performed by Amoeba

• Formation of pseudopodia is stop due to lack of food
• Amoeba or protest is called as cyst

3       Budding :- Asexual reproduction occurs by budding in yeast

Yeast all is called as parent cell

B ) Asexual Reproduction in Multicellular organisms.

          1 Fragmentation:-

          The body of organisms break up into many Fragments and each fragment starts to live as an independent new organisms

eg:- Spirogyra, Sycon

        2 Regeneration:- Planaria breaks up its body into two parts and there after each part regenerates remaining part of The body and new Planaria are formed This is called regenerates

 

 

3 Budding:- Hydra under Favorable conditioner an out growth is formed by repeated division of regeneration is called as bad.

 

 

4    Vegetative Propagation:-

Reproduction in Plants with the help of vegetative parts like root, stem, leaf and bud is called vegetative Reproduction

 

          5 Spore Formation :- Spores germinate in moist and warm place and new fungal colony is formed.