MCQExams
0:0:1
CBSE
JEE
NTSE
NEET
Practice
Homework
×
CBSE Questions for Class 11 Medical Biology Structural Organisation In Animals Quiz 9 - MCQExams.com
CBSE
Class 11 Medical Biology
Structural Organisation In Animals
Quiz 9
The main function of clitellum is
Report Question
0%
Coccon formation
0%
Locomotion
0%
Excretion
0%
Copulation
Explanation
The clitellum is part of the reproductive system. The clitellum is a thick, saddle-like ring found in the epidermis (skin) of the worm, usually with a light-coloured pigment. To form a cocoon for its eggs, the clitellum secretes a viscous fluid. The main function of clitellum is cocoon formation. In earthworms, the clitellum can only be seen when the worm is sexually mature.
So, the correct answer is 'Cocoon formation'
Earthworms possess hearts
Report Question
0%
6 pairs
0%
4 pairs
0%
2 pairs
0%
1
Explanation
Earthworm possess a closed vascular system. There are four pairs of hearts in the circulatory system of earthworm , one pair each in 7,9,12 & 13 segments. The hearts located in 7 & 9 th segments are lateral hearts having 4 pairs of valves and those in 12 & 13 segments are called lateral oesophageal hearts having 3 pairs of valves.
So, the correct answer is '4 pairs'.
Clitellum of Pheretima is thick girdle that is
Report Question
0%
Non-glandular around 14-16 segments
0%
Glandular around 14-16 segments
0%
Glandular around 16-18 segments
0%
Non-glandular around 16-18 segments
Explanation
In a mature worm, segments 14-16 are covered by a prominent dark band of glandular tissue called clitellum. Thus the body is divisible into three prominent regions preclitellar, clitellar and post clitellar segments.
So the correct answer is 'Glandular around 14-16 segments'.
Setae occur in earthworm in all segments except
Report Question
0%
Clitellar region
0%
Anal segment
0%
Peristomium
0%
All of the above
Explanation
In Earthworm, each body segment, except the first, last and clitellum, there are rows of S-shaped setae, embedded in the epidermal pits in the middle of each segment. Setae can be extended or retracted. Their principal role is in locomotion. Hence setae occur in Earthworm in all segments except clitellar region, anal segment, and peristomium.
So the correct answer is 'All of the above'.
Blood of
Pheretima
is
Report Question
0%
Blue with haemocyanin in corpuscles
0%
Blue with haemocyanin in plasma
0%
Red with haemoglobin in corpuscles
0%
Red with haemoglobin in plasma
Explanation
The blood of Pheretima is red colored due to the presence of respiratory pigment hemoglobin in it. The hemoglobin is not contained in the corpuscles like the vertebrates but it is found dissolved in the plasma. The plasma also contains many corpuscles which are colorless and nucleated.
So the correct answer is 'Red with hemoglobin in plasma'.
Photoreceptors of Earthworm occur on
Report Question
0%
Clitellum
0%
Anal segment
0%
Dorsal surface
0%
Lateral sides
Explanation
Earthworms do not have eyes they do have specialized photosensitive cells called "light cells of Hess". These photoreceptor cells have a central intracellular cavity (phaosome) filled with microvilli. As well as the microvilli, there are several sensory cilia in the phaosome which are structurally independent of the microvilli. The photoreceptors are distributed in most parts of the epidermis but are more concentrated on the back and sides of the worm. Hence, photoreceptors are present on the dorsal surface.
So the correct answer is 'Dorsal surface'.
In Earthworm, arrangement of blood vessels is
Report Question
0%
Different in last fifteen segments
0%
Different in first thirteen segments
0%
Same throughout
0%
Different in middle thirteen segments
Explanation
The circulatory system of an earthworm is a closed type, as the blood flows only through the blood vessels. The blood vascular system of
Pheretima posthuma
consists of an elaborate system of blood vessels through which blood flows continuously.
The blood vessels and their arrangement in the first thirteen segments
The blood vessels of the circulatory system of earthworm include longitudinal blood vessels, hearts, anterior loops, and the ring vessels.
So the correct answer is 'Different in the first thirteen segments'.
Excretory organs of Earthworm are
Report Question
0%
Coelom
0%
Flame cells
0%
Nephridia
0%
Gizzard
Explanation
The excretory organs occur as segmentally arranged coiled tubules called nephridia. They are of three types septal nephridia, integumentary nephridia, and pharyngeal nephridia. A nephridium starts out as a funnel that collects excess fluid from the ceolomic chamber. The funnel connects with a tubular part of the nephridium which delivers the wastes through a pore to the surface in the body wall into the digestive tube.
So the correct answer is 'Nephridia'.
Which of the following is the characteristic of Cockroach?
Report Question
0%
13-chambered heart
0%
Reduced wings
0%
Cocoon formation
0%
Segmented body
Explanation
The heart of the cockroach is elongated, thick, muscular, tubular and 13-chambered. It lies in the pericardial sinus of the hemocoel. Each chamber of the heart receives oxygenated blood from the dorsal sinus through one pair of slit-like openings called ostia. The heart contracts in a posteroanterior direction and the blood also flows posteroanterior. The alary muscles are responsible for the circulation of blood.
So the correct answer is '13-chambered heart'.
Blood of Cockroach does not contain respiratory pigment. It means Cockroach
Report Question
0%
Does not respire
0%
Respires anaerobically
0%
Oxygen goes to tissues by intracellular capillary system
0%
Oxygen reaches tissues directly through diffusion
Explanation
Haemoglobin is absent in cockroach,the respiratory system consists of a network of trachea, that open through 10 pairs of small holes called spiracles present on the lateral side of the body. Thin branching tubes carry oxygen from the air to all the parts. The opening of the spiracles is regulated by the sphincters. Exchange of gases takes place at the tracheoles by diffusion.
So the correct answer is 'Oxygen reaches tissues directly through diffusion'.
Dorsal vessel of earthworm is
Report Question
0%
Distributing
0%
Collecting
0%
Collecting in first thirteen segments and distributing in the rest
0%
Distributing in first thirteen segments and collecting in the rest
Explanation
The earthworm has a closed vascular system with blood vessels. The dorsal vessel in the first thirteen segments acts as a distributing vessel and extends upto the cerebral ganglion. It gives of branches that supply blood to the anterior regions of the body. After the thirteenth segment it acts as a collecting blood vessel and in each segment it receives blood from a pair of dorsointestinal vessels and commissural vessel.
So, the correct answer is 'Distributing in the first thirteen segments and collecting in the rest'.
Typhlosole found in
Pheretima
occurs in
Report Question
0%
Oesophagus
0%
Stomach
0%
Gizzard
0%
Intestine
Explanation
A pair of short and conical intestinal caecae project from the intestine on the 26th segment. The characteristic feature of the intestine after the 26th segment except for the last 23rd - 25th segments in the presence of an internal median fold of dorsal wall called typhosole. This increases the effective area of absorption in the intestine.
So the correct answer is 'Intestine'.
13-chambered tubular heart is found in
Report Question
0%
Cockroach
0%
Earthworm
0%
Frog
0%
Rabbit
Explanation
The heart of the cockroach is elongated, thick, muscular, tubular and 13-chambered. It lies in the pericardial sinus of the hemocoel. Each chamber of the heart receives oxygenated blood from the dorsal sinus through one pair of slit-like openings called ostia. The heart contracts in a posteroanterior direction and the blood also flows posteroanteriorly. The alary muscles are responsible for the circulation of blood.
So the correct answer is 'Cockroach'.
In Earthworm, the first effective organ for food digestion is
Report Question
0%
Pharynx
0%
Buccal cavity
0%
Mouth
0%
Stomach
Explanation
A terminal mouth opens into the buccal cavity which leads into the muscular pharynx. A small narrow tube, oesophagus, continues into a muscular gizzard. It helps in grinding the soil particles and decaying dead leaves. The stomach extends from 9 - 14 segments. The food of the earthworm is decaying leaves and organic matter mixed with soil.Therefore the first organ for food digestion in earthworm is pharynx.
So the correct answer is 'Pharynx'.
Chromophil cells present on pharynx of earth worm take part in secretion of
Report Question
0%
Mucus
0%
Lipases
0%
Carbohydrases
0%
All the above
Explanation
The pharyngeal secretions of the earthworm are produced by a large number of chromophil cells. These are found in soft white lobules which are located on the dorsal and ventral side of the pharynx. It passes through the connective tissues of the pharynx between the epithelial lining and the pharyngeal lumen. The secretion is mucinous. It also contains the fibrous digesting enzyme.
So the correct answer is 'Mucus'.
Spermathecal pores of
Pheretima
are present in
Report Question
0%
5/6, 6/7, 7/8 and 8/9
0%
6/7, 7/8, 8/9 and 9/10
0%
1/2, 2/3, 3/4 and 4/5
0%
14/15, 15/16, 16/17 and 17/18
Explanation
Four pairs of spermathecae which are flask-shaped with broad pear-shaped ampulla and a short diverticulum or caecum having a narrow neck. The ampulla store nutritive substance produced by prostate gland whereas in diverticulum spermatozoa are stored. It opens intersegmental ly and ventrolaterally in 5/6, 6/7, 7/8, 8/9 a pair each.
So the correct answer is '5/6, 6/7, 7/8 and 8/9'.
The component units of compound eye of
Cockroach are called
Report Question
0%
Eyelets
0%
Fenestrae
0%
Ocelli
0%
Ommatidia
Explanation
Compound eyes are so called because they are
constructed from many similar units called
ommatidia.
Each compound eye may be composed of several
thousand ommatidia. With the help of several ommatidia, a cockroach can receive several images of an object. The compound eyes are situated at the dorsal surface of the head.
So the correct answer is '
Ommatidia'.
Anal style is present in
Report Question
0%
Male Cockroach
0%
Female Cockroach
0%
Both the sexes
0%
None of the two
Explanation
In males, the genital pouch is present at the hind end of the abdomen. The male cockroach has thread-like anal styles, which are missing in the female cockroach. The 10th segment has a filamentous structure called the anal cerci, in both male and female cockroach.
So the correct answer is 'Male Cockroach'.
Spiracles of Cockroach which are larger and always kept open are
Report Question
0%
First and second pairs
0%
First and third pairs
0%
First and tenth pairs
0%
Second and third pairs
Explanation
Spiracles are external openings found in some animal species, such as insects, spiders and some species of fish and whales. The function of spiracles is linked to respiration, helping oxygen to reach internal respiratory organs, such as lungs in whales and tracheae in insects.
In cockroach, the tracheal system opens outside by ten pairs of spiracles. The first and third pairs spiracles remain open all the times.
So, the correct answer is 'First and third pairs'.
Movement of coelomic fluid helps in locomotion of
Report Question
0%
Hydra
0%
Frog
0%
Starfish
0%
Earthworm
Explanation
The setae and the coelomic fluid also assist in the locomotion. The body of earthworm exhibits extension, contraction and anchoring in the anterior and posterior regions during locomotion. Circular and longitudinal muscles of the body wall are useful in extension and contraction of the body. The septa mechanically isolate each segment, keeping the coelomic fluid. The hydrostatic skeleton, making such fine-tuned movements impossible.
So the correct answer is 'Earthworm'.
Enteronephric nephridia of earthworm are connected with
Report Question
0%
Excretion
0%
Digestion
0%
Osmoregulation
0%
All of the above
Explanation
The enteronephric nephridia play an important role in the digestive process as it moistens the food and helps in digestion. The nitrogenous compound is used by symbiotic bacteria which lives inside the alimentary canal. The enteronephric nephridia are also called protonephridia as it helps in digestion. It also helps in osmoregulation, as the water which passes through the alimentary canal is absorbed in an intestine, and water is conserved in dry regions. Enteronephric nephridia also helps in excretion process.
So, the cirrect answer is 'All of the above'
Chloragogen cells in
Pheretima
are specialised for
Report Question
0%
Nutrition
0%
Excretion
0%
Reproduction
0%
Respiration
Explanation
Chloragogen cells, also called as y cells are cells in annelids that function similarly to the liver in vertebrates. The cells store glycogen and neutralize toxins, are yellowish in colour due to the presence of yellow granules called chloragosomes and are present in the coelomic fluid of some annelids. These cells are derived from the inner coelomic epithelium and help in excretory functions.
So the correct answer is 'Excretion'.
Heart of Cockroach is
Report Question
0%
10 segmented
0%
12 segmented
0%
13 segmented
0%
15 segmented
Explanation
Correct Answer: C
Explanation:
The cockroach
has an
open type of blood vascular system
, blood is in direct contact with the tissues and flows freely in the body cavity-
haemocoel
.
Haemocoel contains a
heart
, which consists of a
muscular tube
lying along the
mid-dorsal line
of the thorax and abdomen.
The heart possesses
13 funnel-shaped chambers
with Ostia on either side,
one
in
each segment
.
Hence, the correct answer is
13 segmented
.
Nephrostome occurs in earthworm
Report Question
0%
Septal nephridia
0%
Integumentary nephridia
0%
Pharyngeal and septal nephridia
0%
Pharyngeal and integumentary nephridia
Explanation
In earthworm septal nephridia occur on the inter-segmental septum between 15th and 16th segments to the posterior side of the body. Each septal nephridium consists of nephrostome, neck, the body of nephridium and the terminal duct. It is also known as ciliated funnel or nephrostome. It is the proximal flattened funnel-shaped structure of the nephridium lying in the coelom.
So the correct answer is 'Septal nephridia'.
Chloragogen cells of Earthworm are similar to an organ of vertebrates
Report Question
0%
Liver
0%
Lung
0%
Kidney
0%
Spleen
Explanation
Chloragogen cells store glycogen and neutralize toxins, are yellowish in colour due to the presence of yellow granules called chloragosomes and are present in the coelomic fluid of some annelids. It is similar to the liver of a vertebrate. They take part in the deamination of amino acids and synthesis of urea.
Silicates taken in along with food are deposited in the chloragogen cells.
So the correct answer is '
Liver'.
Colleterial gland is present in
Report Question
0%
Male Cockroach
0%
Female Cockroach
0%
Both the sexes
0%
None of the two
Explanation
The colleterial glands of insects are organs associated with the female genital apparatus. In cockroaches, these glands produce secretions that cover two parallel rows of eggs during oviposition, and in oviparous species, these secretions become the tanned, sculpted, rigid outer casing of the ootheca.
So the correct answer is 'Female Cockroach'.
In Earthworm, dorsal blood vessel is collecting channel
Report Question
0%
Behind 13th segment
0%
Anterior 13 segment
0%
Throughout
0%
In typhlosolar region
Explanation
In the first thirteen segments, the dorsal vessel acts as a distributing vessel and extends up to the cerebral ganglion. It runs along the mid-dorsal line of the body and just above the alimentary canal, there are few longitudinal vessels acting as collecting or distributing vessels which are connected with one another by some transverse vessels acting as the heart.
So the correct answer is 'Behind 13th segment'.
Oxygen carrying earthworm is
Report Question
0%
Haemocyanin
0%
Haemoglobin
0%
Haemoerythrin
0%
Chlorocruorin
0%
Pinnaglobin
Explanation
The blood of
Pheretima
is red coloured due to the presence of respiratory pigment haemoglobin (a red oxygen-carrying pigment). The haemoglobin is not contained in the corpuscles but it is found dissolved in the plasma and it is known to transport oxygen to the different part of the body in the earthworm.
So the correct answer is 'Haemoglobin'.
Which one does not occur in Earthworm
Report Question
0%
Septal nephridia
0%
Macronephridia
0%
Integumentary nephridia
0%
Pharyngeal nephridia
Explanation
In
Pheretima
there are three types of nephridia,
1. Septal nephridia: These are found situated on the inter-segmental septum between 15th and 16th segments to the posterior side of the body.
2. Integumentary nephridia:
n each segment of the body from 7th to the last segment, numerous nephridia are found attached inside the lining of the body wall. These are called integumentary nephridia
3. Pharyngeal nephridia:
These nephridia lie in three paired tufts, one on either side of the anterior region of the alimentary canal in the segments 4th, 5th, and 6th. The tufts of pharyngeal nephridia also contain blood glands.
So the correct answer is 'Macronephridia'.
Nephridia of
Pheretima
are
Report Question
0%
Protonephridia
0%
Solenocytes
0%
Micrometanephridia
0%
Meganephridia
Explanation
Integumentary nephridia are smallest nephridia of
Pheretima
. So they are also called as micro nephridia. They lie scattered on the entire internal surface of the body wall except in the first two segments. They are V-shaped structures and hang out in the coelom. The number ranges from 200-250 in each segment, except in the clitellar segments. In the clitellar segments, they are ten times more than the usual number.
So the correct answer is '
Micrometanephridia'.
Open vascular system is absent in
Report Question
0%
Housefly
0%
Cockroach
0%
Silver Fish
0%
Earthworm
Explanation
Pheretima
exhibits a closed vascular system, consisting of blood vessels, capillaries, and heart. Due to the closed circulatory system, blood is confined to the heart an blood vessels. Contractions keep blood circulating in one direction. Smaller blood vessels supply the gut, nerve cord, and the body wall.
Hence earthworm has closed blood vascular system.
So the correct answer is 'Earthworm'.
Locomotion occurs in earthworm with the help of:
Report Question
0%
Setae
0%
Setae and circular muscles
0%
Parapodia
0%
Setae, circular muscles and longitudinal muscles
Explanation
An earthworm moves by using two different sets of muscles - circular muscles and longitudinal muscles. When the circular muscles contract, the earthworm stretches, becoming longer and thinner. The earthworm uses its setae to anchor the front of its body in the soil. Now the longitudinal muscles contract and the earthworm becomes shorter and wider or it bends from one side to the other, pulling the body forward. The earthworm withdraws the front setae and uses its rear setae to anchor itself at the back. The earthworm uses its circular muscles to lengthen and push itself forward again.
So, the correct answer is option D - Setae, circular muscles and longitudinal muscles.
Number of lateral hearts in
Pheretima
are
Report Question
0%
8
0%
12
0%
16
0%
4
Explanation
In Pheretima the posterior segments behind 13th the dorsal and ventral blood vessels have no direct connections but anteriorly both these vessels are connected together by 4 pairs of pulsatile hearts which are neurogenic, i.e., the heartbeat originates in the nerve cells of the hearts. The hearts are contractile and encircle the alimentary canal, they are in the segments 7th, 9th, 12th, and 13th.
So the correct answer is '8'.
Blood glands of
Pheretima
take part in
Report Question
0%
Formation of red blood corpuscles
0%
Formation of phagocytes
0%
Maintenance of blood volume
0%
Maintenance of blood circulation
Explanation
Blood glands are present on the 4th,5th and 6th segments. They produce blood cells and haemoglobin which is dissolved in blood plasma. Blood cells are phagocytic in nature. The blood vascular system of Pheretima is of closed type. It consists of the blood vessels, hearts, loops, capillaries, and the blood glands. Hence blood glands help in the formation of phagocytes.
So the correct answer is 'Formation of phagocytes'.
Number of chambers in heart of Cockroach is
Report Question
0%
4
0%
10
0%
13
0%
15
Explanation
In Cockroach, the heart lies mid dorsally. It is pulsatile. It consists of 13 segmentally arranged funnel shaped chambers. Except the last one, each chamber has a pair of small lateral apertures or ostia that open into pericardial sinus.
So, the correct answer is '13'.
Which is not correct for Earthworm
Report Question
0%
It walks with a speed of 25 cm/min
0%
It can remain without oxygen for 630 hrs
0%
Life span is 3.510 years
0%
Setae easily dissolve in KOH
Explanation
The setae in earthworm are made up of chitin. The hot KOH cannot dissolve chitin and hence if the earthworm is placed in KOH solution, the setae would be left undissolved.
So, the correct answer is 'Setae easily dissolve in KOH'.
Ommatidia serve the purpose of photoperception in
Report Question
0%
Cockroach
0%
Frog
0%
Humans
0%
Sunflower
Explanation
The photoreceptors in cockroach are of two types. They are the compound eyes or ommatidium and ocelli. These help in photoreception in cockroaches.
So, the correct answer is 'Cockroach'.
Chloragogen cells functionally resemble
Report Question
0%
Collar cells
0%
Plasma cells
0%
Flame cells
0%
Mesophyll cells
Explanation
The chloragogen cells are also called as 'y-cells'. These cells in annelids are functionally similar to liver of vertebrates. These cells undertake many functions. They store glycogen and also neutralize toxins. They also take part in deamination of amino acids and synthesise urea. These cells which are yellow in colour and aid in excretion are functionally similar to flame cells of freshwater invertebrates, whose chief function is also excretion.
So, the correct answer is 'Flame cells'.
Number of segments in the anal cerci of Cockroach is
Report Question
0%
12
0%
15
0%
18
0%
10
Explanation
The abdomen bears 8 pairs of stigmata, anus and a pair of anal cerci.
Anal cerci are developed from the junction between 9th and 1Oth segments on the dorsal side one on
each side. The total number of segments present in anal cercus 15. They occur in both male and female
cockroaches. They are regarded as the appendages of the vestigial eleventh segment. Therefore the nu
mber of segments in the anal cerci of Cockroach is 15.
So the correct answer is '15'.
Enzyme found in saliva of cockroach is
Report Question
0%
Amylase
0%
Cellulase
0%
Protease
0%
Both A & B
Statement (S): Respiratory system of Periplaneta is polyneustic type
Reason (R). In Periplaneta thoracic spiracles help in expiration and abdominal spiracles help in inspiration.
Report Question
0%
S is correct but R is wrong
0%
S is wrong but R is correct
0%
Both S and R are correct and R is correct explanation of S
0%
Both S and R are correct and R is not correct explanation of S
In Cockroach, gizzard is part of
Report Question
0%
Respiratory system
0%
Digestive system
0%
Immune System
0%
Circulatory system
Explanation
The digestive system of cockroach consists of the pharynx, the esophagus, the crop, the intestine, and the gizzard. After the food passes through the esophagus, the food moves into the crop where it is stored and then eventually moves into the gizzard. The gizzard uses stones that the earthworm eats to grind the food completely. The food moves into the intestines as gland cells in the intestine release fluids to aid in the digestive process.
So the correct answer is 'Digestive system'.
The gland whose secretion facilitates attachment of two earthworms during copulation is located in segment
Report Question
0%
14
0%
18
0%
19
0%
22
Explanation
Secretions of accessory glands facilitate attachment of two earthworms during copulation. The accessory glands are two pairs. They are situated one each in 17 th and 19 th segment on the ventral body wall at the lateral sides of the nerve cord.
So, the correct answer is '19'.
Type of feeding in Earthworm is
Report Question
0%
Fluid feeding
0%
Filter feeding
0%
Detritus feeding
0%
Tentacle
Explanation
Earthworm is omnivorous and nocturnal. It is commonly found living in soil, feeding on live and dead organic matter. These scavenge the earth's surface and decompose the dead and decaying organisms. This area also used in the production of compost which acts as organic manure.
So, the correct answer is 'Detritus feeding'.
Number of spiracles found in Cockroach are
Report Question
0%
5 thoracic, 3 abdominal
0%
3 thoracic, 5 abdominal
0%
8 thoracic, 2 abdominal
0%
2 thoracic, 8 abdominal
Explanation
In cockroach, the respiratory system has a network of the trachea. They open through 10 pairs of spiracles that are present on the lateral side of the body. Thin tubes carry oxygen from the air to all the parts of the body. The spiracles are regulated by the sphincters. Exchange of gases takes place by diffusion.
These are organized as 2 pairs of thoracic spiracles and 8 pairs of abdominal spiracles.
So the correct answer is '2 thoracic, 8 abdominal'.
Adhesive pads present in legs of Cockroach are
Report Question
0%
Galeae
0%
Lacineae
0%
Glossae
0%
Plantulae
Explanation
The adhesive pads are present at the tip of each tarsal segment in cockroaches. These help them while climbing smooth surfaces. These adhesive pads are called plantulae.
So, the correct answer is 'Plantulae'.
In Earthworm, dorsal wall of intestine from 26th segment to 95th segment forms a median internal fold called
Report Question
0%
Trochophore
0%
Typhlosole
0%
Clitellum
0%
Trachea
0%
Nephridium
Explanation
In earthworm, the characteristic feature of intestine after 26th segment except the last 23-25th segments is the presence of internal medial fold of dorsal wall called 'Typhlosole'. Typhlosole increases the effective area of absorption in the intestine.
So, the correct answer is 'Typhlosole'.
Brown colour of earthworm is due to
Report Question
0%
Melanin
0%
Porphyrin
0%
Haemoglobin
0%
Both A and B
Explanation
Earthworm is a glistening deep brown in colour. The dorsal surface is darker than the ventral surface and carries a dark colour median line due to the dorsal blood vessel which is seen through the integument. The brown colour of the worm is due to the pigment porphyrin present in the body wall and it protects the body against bright and UV rays of the sunlight.
So the correct answer is 'Porphyrin'.
In Earthworm, gizzard occurs in segment
Report Question
0%
5
0%
6
0%
8
0%
10
Explanation
In earthworm, a terminal mouth opens into a buccal cavity which leads into a muscular pharynx. A small narrow tube, oesophagus continues into a muscular gizzard (8-9 segments). It has a thick wall of circular muscles lined by columnar cells which is further lined by the cuticle. The gizzard grinds the food into a fine state. It helps in grinding the soil particles and decaying leaves. The gizzard uses stones that the earthworm eats to grind the food completely.
So the correct answer is '8'.
In Cockroach which one is absorbed in hepatic caeca
Report Question
0%
Glucose and amino acids
0%
Lipids
0%
Glucose
0%
Both B and C
Explanation
Hepatic caeca produce digestive enzymes. With the help of these digestive enzymes, the digestion of food takes place in the mesenteron. Here digestive enzymes are poured by hepatic caeca. These digestive enzymes contain gastric amylase, maltase, invertase tryptase, and lipase.
The digestion of carbohydrates, proteins,
and
fats is completed. Hence in the cockroach, both Glucose and amino acids are absorbed in hepatic caeca.
So the correct answer is '
Glucose and amino acids'.
0:0:1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
0
Answered
0
Not Answered
0
Not Visited
Correct : 0
Incorrect : 0
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Practice Class 11 Medical Biology Quiz Questions and Answers
<
>
Support mcqexams.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page
