Earthworm has no skeleton but during burrowing, the anterior end becomes turgid and acts as a hydraulic skeleton due to
setae
circular muscles
coelomic fluid
longitudinal muscles
Correct Answer :
C. coelomic fluid
Related Questions
Spermathecae in earthworm represent
coating of sperms
structure for storing sperms
male copula to ry organs
female copulatory organs
The chloragogen cells of earthworm are analogous to
liver of invertebrates
liver of vertebrates
kidney of vertebrates
uriniferous tubules of vertebrates
Which region in earthworm is the forest of nephridia ?
Pharyngeal region
Clitellar region
Intestinal region
Typhlosolar region
The excretory organs of earthworm are
kidneys
solenocytes
nephridia
green glands
5. The pre-typhlosolar region in Pheretima extends from
fifth to twenty-sixth segment
first to twenty-sixth segment
fifteenth to twenty-sixth segment
immediately after clitellar region to twenty sixth segment
Which of the following statements is correct ?
Blood of earthworm is blue in colour
Blood pigment of earthworm is haemocyanin
Blood pigment of earthworm is red and haemoglobin is dissolved in plasma
Blood of earthworm is red and haemoglobin is dissolved in RBC
Chetae are totally absent in
Nereis
Hirudinaria
Heteroneresis
Pheretima
The fertilization in earthworms occurs in
oviduct
spermatheca
cocoon
clitellum
The nitrogenous waste in earthworm consist of about
40% urea and 40% uric acid
50% urea and 40% ammonia
40% ammonia and 20% amino acids
60% ammonia and 20% amino acids
The dorsal blood vessel in earthworm is
distributive in 1-13 segments
collective in 1-13
completely distributive
completely collective
Chloragogen cells of Pheretima play a role very much like that of
Liver of vertebrates
Choanocytes of sponges
Malpighian tubules of vertebrates
None of these
Role of typhlosole in the intestine of earthworm is
to kill bacteria
to increase absorptive surface
to produce digestive enzymes
to control blood flow
In earthworm, the genital papillae are situated ventrally on segments
17
18
19 and 22
17 and 19
In earthworm, the circular muscles are highly developed in
body wall
gizzard
typholsole
pharynx
The cliteilum singulum in earthworm is formed by
12,13 and 14 segments
13,14 and 15 segments
14,15 and 16 segments
16,17 and 1&segments
The female genital aperture in earthworm is present ventrally on segment
10th
12th
14th
18th
In earthworm testes are situated in the
10th and 11th segments
11th and 12th segments
14th and 15th segments
none of these
Earthworms do not have any respiratory organs because
they do not need them
they are burrowing in habit
there is no sufficient space for such organs
the surface acts as an absorptive area which is larger than the volume
In the blood vascular system of earthworm there are four pairs of hearts present in the first 13 segments. These are situated in the segments
7th, 8 th, 9th and 10th
8th, 10th, 12th and 15th
8th, 9th, 12th and 13th
7th, 9th, 12th and 13th
In earthworm fertilisation occurs in
oviduct
water
cocoon
ootheca
Chromophil cells in earthworm are concerned with the secretion of
amylase
proteases
lipases
cocoon
In earthworm, the septal nephridia put their excretory discharge into
intestine
blood
coelom
gizzard
Annelids show advancement over the nematoda in having
metameric segmentation
true coelom
closed circulatory system
all of these
A chitinous lining in earthworm is found in
pharynx
stomach
typholsole
gizzard
Haemoglobin is dissolved in plasma is
Earthworm
Ascaris
Tapeworm
Insects
Earthworm is useful because it
helps in fixing atmospheric nitrogen
helps in making the land porous
kills harmful bacteria of the soil
helps in making the land fertile by turning it upside down
Nephrostomes are found in
integumentary nephridia
septal nephridia
pharyngeal nephridia
none of these
In earthworm, the nephridia without neprostomes are
pharyngeal
integumentary
both (a) and (b)
none of these
Pheretima is
sterile
unisexual
hermaphrodite
radial symmetrical
The direction of blood flow in the dorsal vessel of earthworm is
from the posterior to the anterior end
from the anterior end to the posterior end
from dorsal vessel to ventral vessel
alternately in both directions (a) and (b)