Earthworms have tiny stiff hairs (setae) on almost every segment, and these little hairs help the earthworm move. As earthworms stretch out and then contract their muscles the setae grab the soil and move the earthworm forward.
The setae are visible under a microscope and their position on the body is used for identification. On larger earthworms the setae are so large that it makes the earthworm feel rough and bristly. If you get some big earthworms, be sure to have students feel the setae.
Which segment of earthworm lack setae?what is the movement of earthworm called either positive geotropism or negative geotropism and why??
First, last and clitellar segment lacks setae. The movement of the earthworm is neither positive geotropism nor negative geotropism. It exhibits positive geotaxis. It moves against the soil surface so this movement is called positive geotaxis.
If the movement is against soil then why is it called positive?
Positive geotaxis means movement towards the centre of the earth so for that earthworm should move against the soil!
its called against the soil surface not the soil. And it is positive geotaxis as earthworm moves away from soil surface or towards geo centre( i.e, inside soil ).
But in case of immature earthworm setae is present in clitellar region
The first last and cliteelum lacks setae in case of earthworm. The movemnt if positive geotropism.
The movement is positive geo taxis
First last and clitellar segment lack setae and it shows+be geotaxis as it lives inside soil
setae is found in all segments except 1st , last and clitellum region.
it shows positive geotaxtis because is moves against light .i.e. it shows negative photo taxis.
Gemmules are present in spongilla. Is it right?
yes ..
yes gemmules are internal bud in sponges
Sir I m heading for the bpkihs preparation but for the better study which objective book should I prefer??
you should read dinesh objective physics megha ob chemistry and dinesh biology
Which phase of plasmodium is resistant to drugs?
prep erythrocyte phase
What is Sn1 and Sn2 mechanism?
SN1 and SN2 are the type of nucleophilic substitution reaction .
SN1 stands for nucleophilic substitution unimolecular,i.e.when rexn rate depends only upon substrate concn but not upon nucleophile concn.
whereas in SN2 rate of rexn depends upon concn of both substrate and nucleophile.
I am student of class 11 and I want to be preprad from now for mbbs but I lose my hope sometime and distract although I know u have to learn.
I am student of class 11 and I want to be preprad from now for mbbs but I lose my hope sometime
How much time is given in entrance?
What is the fish called which eats the larva of mosquito?
Gambusia fish
Gambusia
I am a student of class 11. What should i do to get scholarship for MBBS study.
Study well from today …DUHH
What are the other method to get scholorship in MBBS beside hard working?
How many pairs eyes of earthworm?
How it’s blood flow of earthworm?
Earrhworm has no eyes
No eyes only phaosome (photorecepto)r in prostomium
….both from dorsal to ventral and from ventral to dorsal😊
Earthworm has no eye but it has photo receptor organ called phaosome or optic organells
Short cot trick of human and rabbit bone or skeleton system
A DNA fragment has 120 adenine and 120 cytosine.How many nucleotide are present in that fragment?
160 char goff’s rule
A type of golden fish which eat larva of mosquito.
Very very helpful for us and thanks a lot for your devotion to help us (students)
Sir I am going to wait a year for iom which books would be useful for me?
Hello Good morning I want to ask some questions about the MBBS preparation now I am still studying in Grade 11 and I want to take ideas for preparation of MBBS , MOE, IOM
It is true
what is the name of butterfly bone present in our body?
The bone present in the middle of skull so called “Sphenoid bone” because it consists of a body, paired greater wings and lesser wings.
Movement of earthworm towards soil surface?
a)positive geotaxis
b)negative geotaxis
c)positive phototaxis
d)negative phototaxis