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CBSE Questions for Class 11 Medical Biology Structural Organisation In Animals Quiz 4 - MCQExams.com
CBSE
Class 11 Medical Biology
Structural Organisation In Animals
Quiz 4
The contraction of which muscle is involuntary, vigorous and rhythmic?
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Striated muscles
0%
Cardiac muscles
0%
Unstriated muscles
0%
None of the above
Explanation
Cardiac muscles are the muscles of the heart. They are self-contracting, autonomically regulated (meaning involuntary) and must continue to contract in a rhythmic fashion for the whole life of the organism.
Thus,
the correct answer is option (B),
'Cardiac muscles'.
Nissl granules could be seen in
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0%
Bone cells
0%
Gland cells
0%
Myofibrils
0%
Neurons
Explanation
Nissl bodies are large granular bodies, that stain with basic dyes, forming the reticular substance of the cytoplasm of neurons, composed of rough endoplasmic reticulum and free polyribosomes. It is the site of protein synthesis in neurons.
So, the correct answer is option D.
Match the terms listed with the structures where they occur. Choose the answer, which gives the correct combination of alphabets of the two columns.
Structure
Occurrence
A. Haversian canal
p. Kidney
B. Dendrites
q. Cartilage
C. Sarcolemma
r. Muscle
D. Chondrocytes
s. Nerve cells
t. Bone
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A- q, B- r, C- s, D- t
0%
A- p, B- r, C- s, D- t
0%
A- t, B- s, C- r, D- q
0%
A- s, B- t, C- q, D- r
Explanation
Each osteon consists of concentric layers of compact bone tissue, that surround a central canal called the Haversian canal. So, option 'A' matches with option 't'. Dendrites are the short cytoplasmic processes of the cell body of the neuron, which receives stimulus from other neurons. So, option 'B' matches with option 's'. Sarcolemma is the cell membrane of a striated muscle fiber. So, option 'C' matches with option 'r'. Chondrocytes are the only cells in healthy cartilage. So, option 'D' matches with option 'q'.
Thus, the correct answer is the option (C), '
A t, B s, C r, D q
'.
Haemoglobin is dissolved in blood plasma of
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0%
Frog
0%
Rabbit
0%
Cockroach
0%
Earthworm
Explanation
Pheretima
exhibits a closed type of blood vascular system consisting of blood vessels, capillaries and heart. Blood glands are present on the 4$$^{th}$$, 5$$^{th}$$ and 6$$^{th}$$ segments. They produce blood cells and haemoglobin, which is dissolved in blood plasma. Hence, option D is correct.
In which of the following animal, respiration occurs without any respiratory organ?
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0%
Cockroach
0%
Fish
0%
Frog
0%
Earthworm
Explanation
Respiratory organs are lacking in earthworm and gaseous exchange takes place through the skin, which is richly supplied with blood vessels and has to be kept moist by excretion of coelomic fluid through the dorsal pores. Carbon dioxide also diffuses from blood to the skin from where it is eliminated.
Hence, option D is the correct answer.
Name the tissue that connects muscle to bones.
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Tendon
0%
Ligament
0%
Cartilage
0%
All of the above
Explanation
A tendon is a tough band of fibrous connective tissue that usually connects muscle to bone and is capable of withstanding tension.
Ligaments join one bone to another bone.
Cartilage is a flexible connective tissue in animals, including the joints between bones, the rib cage, the ear, the nose, the bronchial tubes and the intervertebral discs.
It is not as hard and rigid as bone, but it is stiffer and less flexible than muscle.
Therefore, the correct answer is option A.
Areolar connective tissue joins:
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0%
Bones with bones.
0%
Fat body with muscles.
0%
Skin with muscle.
0%
Bones with muscles.
Explanation
answer:
Correct Answer: C
Explanation:
Areolar connective tissue is a type of connective tissue whose main function is to bind the various part together.
It is a loose connective tissue which binds skin epithelia with muscles or it also binds with nerves and blood vessels.
It mainly attaches the surface epithelial layer with the underlying layers.
Hence, the areolar connective tissue joins skin with muscle.
Outer border of tergum bends downwards in cockroach and attaches with
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0%
Muscles
0%
Sternum
0%
Pleura
0%
Fat body cells
Explanation
The cockroach has a dorsoventrally flat, compressed body which is covered by a hard, chitinous exoskeleton. It is in the form of separate plates. The dorsal plate is called tergum and the ventral plate is called sternum. Laterally, the plates are joined by pleura. So, outer border of tergum bends downwards in cockroach and attaches with pleura. So, the correct answer is option C.
Which of the following is characteristic feature of the striated muscle?
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It has repeating sarcomeres
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They are spindle shaped
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It has intercalated disc
0%
None of these
Explanation
Spindle-shaped cells are present in smooth muscles.
Heart muscles or cardiac muscles contain intercalated discs.
Muscle cells are composed of muscle fibers or myocytes. These muscle fibers are in turn composed of many chains of myofibrils. Myofibril consists of long proteins like actin, myosin and titin and other accessory proteins. All these proteins are organized into thin and thick filaments, which repeat along the length of the myofibril. The sarcomere is contractile unit of striated muscle. It is present in between two Z lines.
option A is correct
The difference between integumentary and pharyngeal nephridia
relates to
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Vesicle
0%
Funnel
0%
Exonephric nature
0%
None of the above
Explanation
Integumentary nephridia lie attached to the inner side of the body wall in all segments except the first two. The pharyngeal nephridia are located only in the 4th, 5th and 6th segments. These two nephridia extract only waste matter from the capillaries with which they are richly supplied. It is only the integumentary nephridia which open directly to the exterior and so they are called as exonephric nephridia.
Therefore, the correct answer is option C.
Which one of the following pairs of items correctly belongs to the category of organs mentioned against it?
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Thorn of Bougainvillea an tendrils of Cucurbita - Analogous organs
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Nictitating membrane and blind spot in human eye - Vestigial organs
0%
Nephridia of earthworm and malpighian tubules of cockroach - Excretory organs
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Wings of bee and wings of crow - Homologous organs
Explanation
The structures, which are similar in their morphology, anatomy, genetics and embryology but dissimilar in their function are called as homologous organs. The thorn of bougainvillea and tendril in cucurbita are homologous organs. Both arise from an axillary bud. They perform different functions. Thorn provides protection and tendril provide support for climbing. They have anatomical similarity but they differ functionally hence they are called homologous organs. The nictitating membrane is a transparent or translucent third eyelid present in some animals that can be drawn across the eye for protection and to moisten it, while maintaining visibility. Some reptiles, birds, and sharks have full nictitating membrane. Blind spot is a small portion of the visual field of each eye that corresponds to the position of the optic disk (also known as the optic nerve head) within the retina. They are not vestigial organs. Wings of bee and wings of crow are examples of analogous organs because of having a similar function. Nephridia coiled tubular duct-like organs, filter and remove waste from an earthworm's body. The excretory organ of cockroach is the malpighian tubules. It is found at the junction of the midgut and hind gut and are about 150 in number.
so, the correct answer is option is C
In earthworm, skeleton like function is performed by
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0%
Coelomic fluid
0%
Alimentary canal filled with food
0%
Typhlosole
0%
None of the above
Explanation
The earthworm consists of a true coelom which is present between the body wall and alimentary canal. Coelomic fluid is present in the coelom that acts as a hydraulic skeleton. It is helpful in contraction and relaxation of the muscles in the earthworm's body. Alimentary canal aids in digestion. Typhlosole is present in the digestive system of an earthworm and enhances the surface for digestion and absorption of food. So, the correct answer is option A.
Main function of phorphyrin pigment present in earthworm
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Help in respiration
0%
Helps in reproduction
0%
Makes the worm beautiful
0%
Protection from adverse effects of sun
Explanation
The porphyrin pigment present in the body of earthworm provides protection against harmful rays (ultraviolet) of sun and thus prevents its adverse effects. So, the correct answer is option D.
Type of body cavity (coelom) in earthworm is
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Acoelomic
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Schizocoel
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Haemocoel
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Enterocoelic
Explanation
Earthworm consists of a schizocoel type of body coelom in which the cavity is formed by splitting of embryonic mesoderm.
A
coelomic animals have no body cavity at all and the organs are in direct contact with the epithelium.
Haemocoel is
a body cavity that normally contains blood and functions as part of the circulatory system
.
Enterocoel is the cavity that develops from the pockets of the endodermis. It is found in entercoelomates.
So, the correct answer is option B.
Anal styles are found in
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0%
Housefly
0%
Female cockroach
0%
Male cockroach
0%
Both male and female cockroach
Explanation
In male cockroaches, the 9th segment bears a pair of short, a thread like anal styles, which are absent in females. The anal style sense something is coming from the cockroaches back and allows it to run in the opposite direction. So, the correct answer is option C.
Which of the following segment of an earthworm contains the f
emale genital pore?
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0%
15
0%
16
0%
14
0%
18
Explanation
There is a single female genital pore present on the 14th segment in the body of an earthworm. As the 14th segment also has clitellum around it, thus the pore is present on the clitellum. So, the correct answer is option C.
Choose the wrong statement with reference to smooth muscles.
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Muscle fibres show alternate dark and light bands.
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They are spindle-shaped uninucleate cells.
0%
They are involuntary muscles.
0%
They are found in the iris of the eye.
Explanation
Muscle fibres of smooth muscle do not show striations which means they do not have alternate light and dark bands, like in skeletal muscles.
So, the correct option is A.
Periplaenta americana
differs from
Blata orientalis
in having
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Well developed wings
0%
Wings absent
0%
Only first pair wings developed
0%
Second pair wing developed
Explanation
Periplaneta americana
(American cockroach) differs from
Blata orientalis
(Oriental cockroach) in having well-developed wings. The organism bears two pairs of wings. The forewings, known as tegmina arises from mesothorax and is dark and opaque. The hind wings arise from metathorax and are used in flight. Oriental cockroach appearing to be wingless at a casual glance but has two very short and vestigeal wings just below the head.
So, the correct answer is option A.
Complete digestion takes place in which part of cockroach?
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0%
In crop
0%
In Gizzard
0%
In stomach
0%
In oesophagous
Explanation
Cockroaches belong to phylum Arthropoda which has well developed the digestive system. The digestion of starch in the buccal cavity is followed by complete grinding of food in crop and gizzard which finally enters the stomach. The digestive enzymes secreted by the gastric caeca act upon the food in the stomach. These enzymes include amylase, maltase, invertase, tryptase and lipase. The remaining carbohydrates, proteins and fats are digested here.
The digested food is absorbed through the stomach walls into the surrounding space which is called the haemocoel. The haemocoel consists of a large number of fat bodies which are fat cells having fat globules, protein granules and glycogen. They form storage structures which transport to different parts of the body. So, the correct answer is option C.
The body cavity of cockroach is called as
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0%
Pseudocoel
0%
Coelom
0%
Haemocoel
0%
Hydrocoel
Explanation
Body cavity of cockroach is known as haemocoel, as it remains filled with haemolymph (blood). The coelom that is, haemocoel is divided into 3 main sinuses by a dorsal and ventral horizontal diaphragm:
-Pericardial sinus (surrounding the heart and aorta)
-Perivisceral sinus (surrounding the various visceral organs)
-Perineural sinus ( surrounding the ventral nerve cord)
Pseudocoel is the body cavity of certain invertebrate metazoan animals between the body wall and the intestine, which is not lined with a mesodermal epithelium.
Coelom is the body cavity of higher metazoans, between the body wall and intestine, lined with a mesodermal epithelium.
Hydrocoel is the accumulation of serous fluid in a body sac.
Therefore, the correct answer is option C.
Bacteria present in the body surface of earthworm are destroyed
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0%
By excretory substance secreted by nephridia
0%
By coelomic fluid
0%
By antibodies
0%
By saliva
Explanation
Coelomic fluid consists of phagocytes, mucocytes, circular and chloragogen cells. The amoebocytes are numerous in number and serve as phagocytes. These play an important role in the destruction of bacteria on the body surface of an earthworm. So, the correct answer is option B.
Body segments are definite and well marked in
Report Question
0%
Hydra
0%
Tapeworm
0%
Leech
0%
Cockroach
Explanation
Cockroach belongs to Arthropoda which is covered by an exoskeleton. The body is divided into three regions head, thorax and abdomen. They have a true coelom and have open spaces known as sinus. The segmentation is internal as well as internal while in hydra, tapeworm and leech only external segments are present
So, the correct answer is option D.
Which structure
in earthworm is capable of secreting hormones?
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0%
Nerve cord
0%
Lymph gland
0%
Cerebral ganglia
0%
Chloragogen cells
Explanation
The nerve cord and cerebral ganglia present in the body of an earthworm is an important component in the nervous system of earthworm and plays an important in the transmission of sensory and motor impulse. The secretion of lymph glands plays an important role in the destruction of bacteria.
Chloragogen cells stores extra glucose as glycogen and help in neutralising the toxins. So, the correct answer is option D.
In earthworm, the enteronephric nephridia opens in
Report Question
0%
Body surface
0%
Buccal cavity
0%
Intestine
0%
Both B and C
Explanation
Septal and pharyngeal nephridia discharge their waste products into the alimentary canal including buccal cavity and intestine, they are called as enteronephric nephridia.
Therefore, the correct answer is option D.
Earthworm is ........... when water availability is reduced.
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0%
Ammonotelic
0%
Uricotelic
0%
Ureotelic
0%
Amminotelic
Explanation
Ureotelic organisms are those that excretes excess nitrogen as urea. Urea is their major excretory product. Earthworms excrete urea as major excretory product and so is ureotelic. Ammonotelic, amminotelic and uricotelic organisms excrete excess nitrogen as ammonia, amino acids and uric acid respectively. So, the correct answer is option C.
If an earthworm releases cocoons from posterior end instead of
anterior end then
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Digestion will be affected
0%
Only one zygote will be formed in cocoon
0%
Several zygotes will be formed in cocoon
0%
Sperms will not reach the cocoon and fertilization will not take place
Explanation
Earthworms are the tube-shaped segmented bisexual organism. The saddle-like ring found in the epidermis of the worm covers several segments toward its anterior end. To form the cocoon for its eggs, the clitellum secretes a viscous liquid which forms a ring around the worm. The mating pair overlaps the front ends ventrally and exchanges the sperm which is later injected into the eggs in the cocoon where the embryonic worms develop. If cocoon is released by the posterior end then sperm will not reach the cocoon and fusion will not take place. So, the correct answer is option D.
In earthworm, neurons are
Report Question
0%
Motor
0%
Sensory
0%
Adjustor
0%
All of the above
Explanation
The nervous system of earthworm consists of central, peripheral and sympathetic nervous system. The central nervous system consists of two ganglia, which are connected with the nerve cord. It consists of a motor, sensory and adjustor neurons. Sensory neurons carry the information from the effector organ to the brain and the brain transmits the signals to the effector organ by motor nerves. Adjuctor neurons are the connecting link between sensory and motor. So, the correct answer is option D.
Common feature between cockroach and earthworm is
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0%
Hermaphroditism
0%
Moulting of cuticle
0%
Excretion by nephridia
0%
Ventral nerve cord
Explanation
The ventral nerve cord makes up the nervous system of some phyla of the invertebrates, particularly within the nematodes, annelids and the arthropods. It usually consists of cerebral ganglia anteriorly with the nerve cords running down the ventral plane of the organism. This characteristic is important in qualifying the difference compared to the chordates, which have a dorsal nerve cord. It is present in both cockroach and earthworm.
In biology, a hermaphrodite is an organism that has reproductive organs normally associated with both male and female sexes. Many taxonomic groups of animals (mostly invertebrates) do not have separate sexes. It is present in only earthworms.
Moulting of the cuticle is present only in the cockroach
Excretion by nephridia is found only in earthworms
So, the correct answer is '
Ventral nerve cord'
Earthworm is friend of farmers, because it
Report Question
0%
Produces humus
0%
Eats soil bacteria
0%
Increases fertility of soil
0%
Eats the plant
Explanation
Earthworms re-distribute organic materials within the soil, increase soil penetrability and under certain conditions, influence ion transport in soils. So, earthworms influence the supply of nutrients in several ways thereby increasing the fertility of the soil. Hence, they are considered as good friends of farmers. So, the correct answer is option C.
If a T.S. is done through
20$$ ^{th}$$
segment of
Pheretima,
it will contain
Report Question
0%
Intestinal cacea
0%
Prostate gland
0%
Intestine
0%
Both B and C
Explanation
The prostate glands extend from 16$$^{th}$$ to 21$$^{st}$$ segment and are made of glandular and non-glandular parts. The intestine is wide tube and is divided into the post-typhlosole region in segments 15-26. Thus, the T.S through the 20$$^{th}$$segment will have intestine and prostate gland both. So, the correct answer is option D.
Earthworm contains blood pigment, known as
Report Question
0%
Haemoglobin
0%
Haemocyanin
0%
Haematin
0%
Melanin
Explanation
In earthworms, the blood vascular system is of closed type. The blood of earthworm is red and haemoglobin is found dissolved in the blood plasma. RBCs are absent in them. The aortic arches, dorsal blood vessels, and ventral blood vessels are three major blood vessel for circulation of blood. So, the correct answer is option A.
Lateral oesophageal heart connects
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0%
Dorsal vessel and ventral vessel
0%
Supra oesophageal vessel and lateral oesophageal vessel
0%
Dorsal vessel, supra oesophageal vessel and ventral vessel
0%
Dorsal vessel and subneural vessel
Explanation
The earthworm has a closed circulatory system which consists of blood, blood vessels and heart. The hearts present in the 12$$^{th}$$ and 13$$^{th}$$ segment in the body of earthworm are known as lateral oesophageal hearts. The dorsal vessel is the longest vessel that extends through out the body of earthworm and lies above the alimentary canal. The ventral vessel is located below the alimentary canal at an anteroposterior position. Supra-oesophageal vessel lies on the stomach in the median position. Thus, lateral oesophageal heart connects the above three vessels.
So, the correct answer is option C.
Earthworm increases the
Report Question
0%
Salanity of soil
0%
Acidity of soil
0%
Fertility of soil
0%
All of the above
Explanation
Earthworms have the habit of making burrows by swallowing the earth, which leads to ploughing and manuring of soils. Burrows make the soil porous, improve drainage and help in root penetration, borrowing leads to turning over the soil. Their castings reduce both acidity and alkalinity of soil and make the soil fertile.So, the correct answer is option C.
The term tissue is coined by
Report Question
0%
Bichat
0%
Mayer
0%
Malpighi
0%
Hertwig
Explanation
The tissue is an ensemble of similar cells from the same origin that together carry out a specific function. Organs are then formed by the functional grouping together of multiple tissues.
Marie François Xavier Bichat was a French anatomist and physiologist, who is best remembered as the father of modern histology and descriptive anatomy. Despite working without a microscope, he was the first to introduce the notion of tissues as distinct entities, and maintained that diseases attacked tissues rather than whole organs or the entire body, causing a revolution in anatomical pathology. So, the correct answer is option A.
The colour of haemolymph of cockroach is
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0%
Yellow
0%
Red
0%
Green
0%
Colourless
Explanation
Hemolymph is a fluid, analogous to the blood in vertebrates that circulates in the interior of the arthropod body remaining in direct contact with the animal's tissues. In cockroach, the hemolymph is colourless.
Therefore, the correct answer is option D.
Haversian canal contains:
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Blood vessels and nerves
0%
Blood vessels only
0%
Lymphatic vessels only
0%
Connective tissues only
Explanation
The Haversian canal contains blood vessels and nerves. Haversian canals are a series of tubes around narrow channels that are formed by the lamellae in the bones.
So, the correct option is A.
Major inorganic component of bone is:
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0%
Calcium phosphate
0%
Calcium carbonate
0%
Sodium hydroxide
0%
Potassium hydroxide
Explanation
Major inorganic component of bone is calcium phosphate. Bone is embedded in matrix which is mostly made up of inorganic salts of calcium and phosphorous.
Hence, the correct option is 'A'.
Volkmann canal interconnects
Report Question
0%
Bone marrow
0%
3$$^{rd}$$ and 4$$^{th}$$ ventricle of brain
0%
Central canals and 4$$^{th}$$ ventricle
0%
Haversian canals
Explanation
Volkmann canal interconnects Haversian canals. Volkmann canals are also known as perforating holes .Volkmann canals are inside osteons. The Haversian canals, interconnect the latter with each other and the periosteum. They usually run at obtuse angles to the Haversian canals and contain anastomosing vessels between Haversian capillaries.
Hence the correct option is D.
Which of the following is found in earthworm?
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0%
Lateral ventricle
0%
Lateral hearts
0%
Lateral spiracles
0%
Spiracles
Explanation
Lateral heart is the blood pumping organ, which is found in earthworm. It is found in the 7th and 9th segments. Hence, option B is correct answer.
Earthworm is known to posses
Report Question
0%
Lateral heart
0%
Lateral ventricles
0%
Lateral spiracles
0%
Spiracles
Explanation
The dorsal and ventral vessels are connected to each other in segments 7, 9, 12 and 13 by means of paired pulsatile hearts. The hearts in 12th and 13th segments are called as lateral oesophageal hearts, while the anterior pairs in the 7th and 9th segments are called as lateral hearts. So, the correct answer is option A.
Which one of the following is the oldest use of earthworm?
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0%
Bait for catching fish
0%
Source of manure
0%
Food of poultry
0%
Medicine for gout
Explanation
Earthworms are the original natural bait. The earthworms are easy to find and also they work on a wide variety of fishes and so is used as a bait since ages.
So, the correct answer is option A.
Who is father of microscopic anatomy?
Report Question
0%
Bichat
0%
Reyush
0%
Malpighi
0%
Hartwig
Explanation
Marcello Malpighi was an Italian physician and biologist regarded as the 'father of microscopical anatomy and histology'. Malpighi gave his name to several physiological features related to the biological excretory system, such as the Malpighian corpuscles, Malpighian pyramids of the kidneys and the Malpighian tubule system of insects.
So, the correct answer is option C.
The ends of two long bones are connected by:
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0%
Cartilage
0%
Muscles
0%
Ligaments
0%
Tendons
Explanation
The ends of two long bones are connected by ligaments.
A ligament is a fibrous connective tissue, that connects bones to other bones.
Cartilage is a non-vascular type of supporting connective tissue that is found throughout the body, while tendons connect bones and muscles.
So, the correct answer is option C.
Which protein is present in largest amount in human body?
Report Question
0%
Collagen
0%
Elastin
0%
Albumin
0%
Keratin
Explanation
Collagen protein is present in the largest amount in the human body. Collagen is the main structural protein of the various connective tissues in animals. As the main component of connective tissue, it is the most abundant protein in mammals, making up from 25% to 35% of the whole-body protein content. Collagen, in the form of elongated fibrils, is mostly found in fibrous tissues, such as tendons, ligaments and skin. It is also abundant in corneas, cartilage, bones, blood vessels, the gut, intervertebral discs and the dentin in teeth.
Hence the correct option is A.
Histiocyte of brain is a
Report Question
0%
Reticular cell
0%
Microglial cell
0%
Hessel's granule
0%
Monocyte
Explanation
Microglia
is referred to as the
histiocytes
of the central nervous system. It
constitutes 10–15% of all
cells
found in the
brain
.
These long-lived cells undergo very little turnover in normal physiological states.
Microglia helps to sense various types of danger and differentially react with a classical or alternative reparative response. Hence, option B is correct.
Ligaments connects
Report Question
0%
Bone to bone
0%
Bone to muscle
0%
Muscle to muscle
0%
Both B and C
Difference between bone and cartilage is in having:
Report Question
0%
Haversian canal
0%
Blood vessel
0%
Lymph vessel
0%
All of the above
Explanation
The haversian canal is a series of tubes around narrow channels formed by lamellae.
The haversian canals surround blood vessels and nerve cells
throughout the bone and communicate with osteocytes
in lacunae
through canaliculi
.
They are present only in bones and not in cartilages.
The matrix of bones are vascular and the matrix of cartilage is non-vascular.
Hence, the correct option is D.
Haversian canal is situated in:
Report Question
0%
Glandular connective tissue
0%
Bones
0%
Blood
0%
Nervous tissue
Explanation
Haversian canals are a series of tubes that contain blood vessels and nerve fibres and are seen in compact bones.
The Haversian canal is absent in other types of connective tissue and nervous tissue.
So, the correct answer is option B.
Which of the following is true statement for leeches?
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0%
They are unsegmented animals
0%
They are all endoparasite
0%
They have a reduced coelom
0%
They are found in sea water, fresh water and moist soil
Explanation
Leeches are segmented worms that belong to the phylum
Annelida
. Leeches are ectoparasites, they attach to the host body and suck blood. Their bodies are much more solid as the spaces in their coelom are dense with connective tissues. The majority of leeches live in freshwater environments, while some species can be found in terrestrial and marine environments as well. So, the correct answer is option D.
Which animal do not possess larval stage in its life cycle?
Report Question
0%
Ascaris
0%
Frog
0%
Taenia
0%
Pheretema
Explanation
Earthworms belong to an Annelida which reproduces sexually. Cocoon contains many fertilised eggs but only one embryo completes development, while other ova serve as nurse cells. The development is direct without a free larval stage. After the development of 2-3 weeks, the young worm crawls out of the cocoon. So, the correct answer is option D.
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Practice Class 11 Medical Biology Quiz Questions and Answers
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