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
Correct Answer :
A. generally at night during rainy season
Related Questions
Which region in earthworm is the forest of nephridia ?
Pharyngeal region
Clitellar region
Intestinal region
Typhlosolar region
Pheretima is
sterile
unisexual
hermaphrodite
radial symmetrical
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
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
Haemoglobin is dissolved in plasma is
Earthworm
Ascaris
Tapeworm
Insects
Annelids show advancement over the nematoda in having
metameric segmentation
true coelom
closed circulatory system
all of these
Nereis is commonly called
earthworm
ringworm
roundworm
clemworm
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 female genital aperture in earthworm is present ventrally on segment
10th
12th
14th
18th
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)
The septal and pharyngeal nephridia open into the alimentary canal and are of enteronephric type. It is an adaptation for
conservation of water
conservation of heat
regulation of temperature
regulation of amino acids
Nephrostomes are found in
integumentary nephridia
septal nephridia
pharyngeal nephridia
none of these
In earthworm, the first segment in which mouth is situated is known as
prostomium
peristomium
stomium
protostomium
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 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
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 number of segments in leech is
26
33
44
120
In earthworm, the genital papillae are situated ventrally on segments
17
18
19 and 22
17 and 19
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
In earthworm fertilisation occurs in
oviduct
water
cocoon
ootheca
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
Anticoagulant secreted by leech is
Hirudin
Heparin
Haematin
Haemozoin
The excretory organs of earthworm are
kidneys
solenocytes
nephridia
green glands
The enteronephric nephridia in earthworm are
integumentary
pharyngeal only
septal only
both (b) and (c)
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
Structure typically represented in every segment of earthworm is
ovary
chloragogen cell
testes
ganglia
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