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
Correct Answer :
D. helps in making the land fertile by turning it upside down
Related Questions
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
Nephrostomes are found in
integumentary nephridia
septal nephridia
pharyngeal nephridia
none of these
In earthworm testes are situated in the
10th and 11th segments
11th and 12th segments
14th and 15th segments
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
Haemoglobin is dissolved in plasma is
Earthworm
Ascaris
Tapeworm
Insects
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)
Blood glands in Earthworm are associated with
excretion
digestion
secretion
none of these
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
A skeleton like function during locomotion of Pheretima is performed by
alimentary canal laiden with mud
blood
coelmic fluid
ventral nerve cord
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
In earthworm, the genital papillae are situated ventrally on segments
17
18
19 and 22
17 and 19
Anticoagulant secreted by leech is
Hirudin
Heparin
Haematin
Haemozoin
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
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
A chitinous lining in earthworm is found in
pharynx
stomach
typholsole
gizzard
Totally marine annelids belong to the
oligochaeta
polychaeta
hirudinea
archainnelida
In earthworm fertilisation occurs in
oviduct
water
cocoon
ootheca
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
The dorsal blood vessel in earthworm is
distributive in 1-13 segments
collective in 1-13
completely distributive
completely collective
Chromophil cells in earthworm are concerned with the secretion of
amylase
proteases
lipases
cocoon
The coelomic fluid in earthworm escapes through
dorsal pores
coelomic pores
nephridial pores
anus
Which region in earthworm is the forest of nephridia ?
Pharyngeal region
Clitellar region
Intestinal region
Typhlosolar region
In Pheretima, the blood glands are located
close to lateral hearts in segments 12 and 13
along the latero-oesophageal hearts in segments 12 and 13
both (a) and (b)
behind the pharyngeal mass in segments 4, 5 and 6
Annelids show advancement over the nematoda in having
metameric segmentation
true coelom
closed circulatory system
all of these
The fertilization in earthworms occurs in
oviduct
spermatheca
cocoon
clitellum
In earthworm, the first segment in which mouth is situated is known as
prostomium
peristomium
stomium
protostomium
Spermathecae in earthworm represent
coating of sperms
structure for storing sperms
male copula to ry organs
female copulatory organs
Locomotion in Earthworm is directly facilitated by
mucus secreted by epidermis
segmentation of the body
rhythmic contraction of segments
setae and contraction of segments
Pheretima is
sterile
unisexual
hermaphrodite
radial symmetrical
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