NCERT Solutions For Class 8th Science C

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8/17/2014

NCERT Solutions for Class 8th Science Chapter 8 Cell-Structure and Functions

NCERT Solutions for Class 8th Science
Chapter 8 Cell-Structure and
Functions
August6,2014byAnandMeena

Class VI to X CBSE Notes
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NCERT Solutions for Class 8th Science
Chapter 8 Cell-Structure and Functions
NationalCouncilofEducationalResearchandTraining(NCERT)BookSolutionsforClass8th Subject:Science
Chapter:Chapter 8Cell-StructureandFunctions
Class8thScienceChapter8Cell-StructureandFunctionsNCERTSolutionisgivenbelow. Question1:
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NCERT Solutions for Class 8th Science Chapter 8 Cell-Structure and Functions

IndicatewhetherthefollowingstatementsareTrue(T)orFalse(F). (a)Unicellularorganismshaveone-celledbody.(T/F)
(b)Musclecellsarebranched.(T/F)
(c)Thebasiclivingunitofanorganismisanorgan.(T/F) (d)Amoebahasirregularshape.(T/F)
Answer:
(a)Unicellularorganismshaveone-celledbody.(T)
(b)Musclecellsarebranched.(F)
(c)Thebasiclivingunitofanorganismisanorgan.(F)
(d)Amoebahasirregularshape.(T)
Question2:
Makeasketchofthehumannervecell.Whatfunctiondonervecellsperform? Answer:

The functionofanervecellistotransmitmessagestothebrainandalsototakeaway messages fromthebraintothereceptororgans.Thus,itcontrolstheworkingofdifferentpartsofthebody. Question3:

Writeshortnotesonthefollowing.
(a)Cytoplasm
(b)Nucleusofacell
Answer:
(a)Cytoplasm:
Itisafluidthatfillsthecellandoccursbetweentheplasmamembraneandthenucleus.Cell organellessuchasmitochondria,ribosomes,Golgibodies,etc.aresuspendedinthecytoplasm. http://schools.aglasem.com/?p=2307

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NCERT Solutions for Class 8th Science Chapter 8 Cell-Structure and Functions

Thecytoplasmhelpsinthe exchangeofmaterialsbetweencellorganelles. (b)Nucleusofacell:
Thenucleusisasphericalstructuregenerallypresentatthecentreofacell.Thenucleusis composedofthefollowingcomponents:

(i)Nuclearmembrane:
Itisadouble-layeredmembranewhichseparatesthecontentsofthenucleusfromthecytoplasm. Thenuclearmembranehasnuclearporesthatallowthetransferofspecificsubstancesin and out ofthenucleus.

(ii)Nucleolus:
Itisasmallsphericalbodythatisnotboundbyanymembrane. (iii)Chromosomes:
Thesearethread-likestructuresthatcarrygenes.Genescontaininformationnecessaryforthe transferofcharacteristicsfromtheparentstotheoffspring.Thus,chromosomesplayan importantroleintheinheritanceofcharacteristics.

Question4:
Whichpartofthecellcontainsorganelles?
Answer:
Cytoplasmisthepartofthecellthatcontainsvariousorganellessuchasmitochondria,ribosomes, Golgibodies,etc.Cytoplasmisafluidthatfillsthecellandoccursbetweentheplasmamembrane andthenucleus.

Question5:
Makesketchesofanimalandplantcells.Statethreedifferencesbetweenthem. http://schools.aglasem.com/?p=2307

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NCERT Solutions for Class 8th Science Chapter 8 Cell-Structure and Functions

Answer:

Question6:Statethedifferencebetweeneukaryotesandprokaryotes. Answer:

Prokaryotes

Eukaryotes

Mostprokaryotesareunicellular.

Mosteukaryotesaremulticellular.

Thenucleusispoorlydefinedduetotheabsence Thenucleusiswelldefinedandissurroundedby ofanuclearmembrane.

anuclearmembrane.

Nucleolusisabsent

Nucleolusispresent.

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NCERT Solutions for Class 8th Science Chapter 8 Cell-Structure and Functions

Cellorganellessuchasplastids,mitochondria,

Cellorganellessuchasplastids,...
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