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Monday, 27 July 2020

fragmentation ,regeneration ,spore formation class X (asexual reproduction)

spirogyra fragmentation diagram - Brainly.in

In fragmentation ----simple multicellular organisms upon maturity  form more individuals from the broken segments eg Spirogyra .This is a very simple primitive method where multicellualar organism is very undifferentiated .

Regenaration ----A fully diffentiated organism has the capacity to give rise to a new individuals from their body parts .This type of reproduction is done by specialized cells eg in this case the simple organisms like Hydra and Planaria ,orgaanism can form many new organisms from their cut body parts
Medical Parasitology & Zoology Conferences | North America

Modern aspects of regeneration and transplantation.

Q What is the difference between regeneration and fragmentation?

A  1 Regeneration occurs in multicellualar organisms with complex body design whereas fragmenation occurs in multicellular organisms with simple body design.

 2 In regenation if organism breaks into pieces the brken parts may or may not form full organism but in  fragmentation the organism if breaks into parts ,all the broken parts will form new organisms .

3 In regenation specialied cells proliferate and form mass of cells and from those mass of cells the new cells and tissues are diffentiated  are formed ,whereas in fragmentation no specialized cells are
involved eg fragmentation in Spirogyre and regeneration in Planaria


Spore formation ---In some multicellualar organisms like Rhizopus or bread mould  reproductive structures called sporangia grow on  thread like structures which develop on bread or any other food .These sporangia look like blobs on a stick .these sporangia bear spores which grow into new Rhizopus when they get dispersed. The spores are covered with thick coat to protect them from unfavourable conditions until they come in contact with moist conditions .
a) What is spore formation? (b) Draw a diagram showing spore ...

Q Why are spores covered with thick coat?

A the spores may have to face un favourable conditions ,therefore they protect themselves with coat to tide over  the unfavourable conditions and once the favourable conditions of moisture resume they dissolve the coat .

Vegetative propagation---
It is a method in which vegetative parts of parts like stem ,root ,leaf  are in involved in reproduction and giv rise to new individual .
vegetative propagation through stem----eg potato ,ginger,onion banana sugarcane
root ----mint ,carrot, raddish , sweet potato, beet root Dahlia, turnip
Leaf---Bryophyllum

write the vegetative reproduction process of bryophyllum - Brainly.in

Q what are the advantages of vegetative propagation?

A 1 Very useful and desired type of varieties can be multiplied by this method
2 Plants like banana ,sugarcane which donot reproduce through seeds can be multiplied by this mthod
3 very easy ,fast and economical method of reproduction
4 4 The plants like mango yield fruits much faster by this method rather than seeds .

167 comments:

  1. mam I have attended today's class
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  110. MAM I ATTENDED TODAY'S CLASS
    VAIBHAV GUPTA
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    Abhinav Maurya
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  112. Mam I have attended today's class and was able to understand all the topics.
    Bhoomi Bhurani
    10-C

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  113. Mam I have attended today's class
    X-C
    Roll no. 7

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  114. Attended today's class.
    Vani kapoor
    X-G

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  115. Mam i was present in today's class and i revised excretion
    Aditya kathuria
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    shreya narula
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  117. Mam i have attended today's class
    Shivank Bhardwaj
    X-G

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  118. Mam I was present in today's class
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    XA

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  119. Mam I was present in today's class
    Viren sehgal
    XA

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  120. Mam i was present in today's class
    Aditya kathuria
    X-A

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    Chehak Oberoi
    X G

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    Manan goel
    Xth G

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  125. Thank you for the notes mam. My work is complete
    Jai Aggarwal
    X-G

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  126. Hello Maam

    I have completed all my work and attended all classes.

    Thank you
    Daksh Chanana
    X-G

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  127. Thank you mam for the notes. My work is complete!
    Ridhi Johri
    X-G

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  128. Maam I have attended all the classes and my work is complete...
    Shlok Gupta
    X-G

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  129. Thank you mam for notes.
    -Jhanvi Bhardwaj
    (X-G)

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  130. Mam attanded the class
    Vedansh vats
    X - G

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  131. Mam I have attended today's class
    Manya
    9th-A

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  132. Mam i had also attended today's class
    bhavya gupta
    9th-A

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  133. 20 Mark's objective and 60 Mark's subjective

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  134. 20 Mark's objective and 60 Mark's subjective

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  135. 20 Mark's objective and 60 Mark's subjective

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  136. 20 Mark's objective and 60 Mark's subjective

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  137. 20 Mark's objective and 60 Mark's subjective

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  138. 20 Mark's objective and 60 Mark's subjective

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  139. 20 Mark's objective and 60 Mark's subjective

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  140. 20 Mark's objective and 60 Mark's subjective

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  141. 20 Mark's objective and 60 Mark's subjective

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  142. 20 Mark's objective and 60 Mark's subjective

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  143. Mam revision started
    Divyam vij
    9th-A

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  144. mam i am present in today's class and doing revision
    Bhavya Gupta
    9th-A

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  145. 20 Mark's objective and 60 Mark's subjective

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  146. 20 Mark's objective and 60 Mark's subjective
    Krishna tiwari
    Roll no 14

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  147. MAM I HAVE ATTENDED TODAYS CLASS
    ATHARV SHARMA
    IX-C

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  148. Mam i hve attended todays class
    Sagar
    IX-C

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  149. Mam I have attended all the classes
    Aryan Chadha
    X-G

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  150. Thank you mam for these notes
    Tanish Mittal
    X-C

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  151. mam i attended the class and know about the new pattern 60+20
    dakshit
    10-G

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  152. Mam i have attended the class.
    Sanskriti
    10-A

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  153. Mam i have attended all classes .
    Thank you for Notes
    Saloni gupta
    Xc

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