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)
Correct Answer :
A. from the posterior to the anterior end
Related Questions
The gizzard of earthworm is an organ of
secretion of slime
excretion
absorption of digested food
crushing the food
In earthworm testes are situated in the
10th and 11th segments
11th and 12th segments
14th and 15th segments
none of these
Anticoagulant secreted by leech is
Hirudin
Heparin
Haematin
Haemozoin
Annelids show advancement over the nematoda in having
metameric segmentation
true coelom
closed circulatory system
all of these
Spermathecae in earthworm represent
coating of sperms
structure for storing sperms
male copula to ry organs
female copulatory organs
The coelomic fluid in earthworm escapes through
dorsal pores
coelomic pores
nephridial pores
anus
In earthworm, the first segment in which mouth is situated is known as
prostomium
peristomium
stomium
protostomium
Chetae are totally absent in
Nereis
Hirudinaria
Heteroneresis
Pheretima
A chitinous lining in earthworm is found in
pharynx
stomach
typholsole
gizzard
Chromophil cells in earthworm are concerned with the secretion of
amylase
proteases
lipases
cocoon
The dorsal blood vessel in earthworm is
distributive in 1-13 segments
collective in 1-13
completely distributive
completely collective
In earthworm fertilisation occurs in
oviduct
water
cocoon
ootheca
Copulation occurs between two earthworms
generally at night during rainy season
generally at day time during rainy season
at night during winter season
at night during summer season
Structure typically represented in every segment of earthworm is
ovary
chloragogen cell
testes
ganglia
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
Nereis is commonly called
earthworm
ringworm
roundworm
clemworm
The coelom in Pherethna is
continuous throughout
continuous throughout except in first 26 segments
continuous only in first four segments
divided into a number of compartments throughout
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
The chloragogen cells of earthworm are analogous to
liver of invertebrates
liver of vertebrates
kidney of vertebrates
uriniferous tubules of vertebrates
The excretory organs of earthworm are
kidneys
solenocytes
nephridia
green glands
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)
In earthworm, the circular muscles are highly developed in
body wall
gizzard
typholsole
pharynx
Which region in earthworm is the forest of nephridia ?
Pharyngeal region
Clitellar region
Intestinal region
Typhlosolar region
A skeleton like function during locomotion of Pheretima is performed by
alimentary canal laiden with mud
blood
coelmic fluid
ventral nerve cord
The terminal nephridial ducts of the septal nephridia of Pheretima open into
each intersegmental septum
septal excretory canal
lumen of the intestine
supra-intestinal excretory ducts
Sperma thecae in earthworm are meant few
producing sperms
storage of its own sperms
storage of sperms of another earthworm after copulation
all of these
The female genital aperture in earthworm is present ventrally on segment
10th
12th
14th
18th
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
Blood glands in Earthworm are associated with
excretion
digestion
secretion
none of these