Friday, March 27, 2020

Class -12th, Chapter-1, Reproduction organism, lecture-2

Difference between juvenile phase and reproductive phase 
Reproduction :-
Reproduction is defined as a biological process in which an organism gives rise to young ones (offsprings) similar to itself. The offsprings grow mature and in turn produce new offspring .

#Reproduction enables the continuity of species generation after generation.

#The organisms habitat, its internal physiology and several other factors are collectively responsible for how it reproduces.

Reproduction is of two types
a) Asexual reproduction
b) Sexual reproduction

Asexual reproduction 
When offspring is produced by a single parent with or without the involvement of gamete formation the reproduction is asexual it is also known as Apomixis.

In a sexual reproduction 

a) Only one parent is required.

b)There is no formation or fusion of gametes.

c)It involves only mitotic division.

d)New organisms develops from somatic part of the parent. (somatogenic reproduction).

e)New organisms are genetically and morphologically identical and they are called clones.

f)It is a rapid and less energy consuming process.

g)lower organisms reproduce by formation of zoospores(chlamydomonas), conidia (penicillium)etc.

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Class 12th, Chapter-1, Reproduction in organism, Lecture-3

Asexual reproduction in protists and monerans:- #In protists and monerans, the organisms or the parent cell divides into two to give rise to...