Structural Organisation in Animals

Class 11th Biology – 7 Structural Organisation in Animals MCQs

The skeletomusculature of earthworms include the muscles and the hydroskeleton which is the

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Coelomic fluid. The muscles of earthworm do not have any firm support. Each segment is separated by a septum. Thus the segmented body possesses a series of more or less isolated coelomic, fluid-filled spaces of fixed volume and this forms a hydrostatic skeleton that enhances the efficiency of locomotion. Options A, C and D are incorrect.

Name the membrane that holds the coils of the small intestine together in frogs?

Correct! Wrong!

Tympanic membrane functions as ears for the frogs. Peritoneum is the serous membrane that forms the lining of the abdominal cavity.Glottis is the area in pharynx where vocal cords are located. So options A, C, and D are wrong choices. Mesentery is the membrane that holds the coils of the small intestine in frogs. So, option B is the correct answer.

Which among the following is NOT TRUE about skin of the frogs?

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Option B is the correct option. The skin of the frog does not contain hair or scales. The skin is generally soft, smooth, and slimy.

The breakdown of detritus into smaller particles by earthworm is a process called

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The break down of detritus into smaller particles by earthworm is known as fragmentation.

Lymph differs from blood in possessing

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Lymph differs from blood in having less protein and no red blood cells. Lymph contains white blood cells.

Formation of cartilage bones involves

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Deposition of bony matter by osteoblasts and resorption by chondroblasts.

The kind of tissue that forms the supportive structure in our pinna (external ears) is also found in

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The kind of tissue that forms the supportive structure in our pinna (external ears) is also found in tip of the nose. External pinna is made up of elastic cartilage. It is a passage towards middle ear.

Find the wrongly matched pair.

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Cartilage is a soft skeletal tissue (a specializes connective tissue) which forms the endoskeleton of the vertebrates.

Earthworms have no skeleton but during burrowing, the anterior end becomes turgid and acts as a hydraulic skeleton. It is due to

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Earthworms have no skeleton but during burrowing, anterior end becomes turgid and acts as a hydraulic skeleton. It is due to coelomic fluid. The coelom is filled with an alkaline milky coelomic fluid. This coelomic fluid contains water, salts proteins and 4 types of cells namely amoeboctyes, mucocytes, circular cells and chloragogen cells.

Earthworms are known as fossorial animals because ____.

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They are adapted to live underground. Fossorial means relating to burrowing or living underground. Fossorial animals are adapted to living underground. Options A and C are incorrect. Option B - Earthworms are found in garden soil but the answer is not specific to the term fossorial.

Kidney of frog is :

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Kidneys are mesonephric in origin. This is due to the mesodermal origin of the kidney. Larva and tailed amphibians are ammonotelic while frogs and toads are ureotelic.

Cardiac muscles contract :

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The cardiac muscles are the special muscles of the Heart. They are not fatigued at all and they work for the life time of the individual. Apart from these muscles, the heart also has pace-maker that hepls it to sustain long duration of stress and strain.

Which among the leg parts of a cockroach can be compared with the knee of man?

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Option A is the correct answer. Each leg of cockroach is composed of different segments - coxa, trochanter, femur, tibia, and tarsus. The trochanter helps the cockroach to bend its leg, just like our knees help our legs to bend.

Which one of the following is correct pairing of a body part and the kind of muscle tissue that moves it ?

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The Structure of the abdominal wall is similar in principle to the thoracic wall. There are three layers, an external, internal and inner-most layer. The vessels and nerves lie between the internal and innermost layers. The abdomen can be divided into quadrants on nine abdominal regions.

Carotene pigment is found in the cells of :

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Some organism have the power to change body colour with the help of pigment carotene in chromatophores present in dermis.

What type of teeth do frogs have?

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Option D is the correct answer. Frogs teeth are acrodont, that is their teeth are attached to the edge of the jawbone without sockets. Frogs teeth are homodont, that is their teeth are all of the same type. Frogs teeth are polyphyodont, that is the teeth are continuously replaced.

Epithelial tissue performs the following functions

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Epithelial tissues have a widespread distribution throughout the body and serve several important functions such as protection, secretion, sensation and absorption.

The process by which bone tissue follows the cartilage model and slowly replaces cartilage to bone is known as _______________.

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Ossification. Option A - Incorrect though replacement requires organic and inorganic calcium salts impregnation in the matrix. Option C and D are incorrect.

The filamentous extension of neuron are known as____.

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The filamentous extension of neuron is known as Axon. Cyton is cell body of neuron, and dendrites are short processes of neuron.

Multinucleate muscle cells are -

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Multinucleate muscle cells are skeletal muscles.

Which cells do not form layer and remain structurally separate?

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Only nerve cells do not form layers. Thses also remain structually separate from each other. Nerve cells or nurons are the cells specialized to conduct an electrochemical current. Nerve tissues is made up of thses cells and supporting cells. Epithelial tissue is made of one or a few layers of compactly arranged cells overlying a basement membrane. Glands are epithelial cells specialized to elaborate and release chemicals for use in body. Muscle tissue is made of elongated and contractile cells called myocytes.

The most abundant tissue in the body is

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Because there are about 639 muscles which constitutes the bulk of body, 40% of total weight and 50% of soft parts.

Which among the following organ secretes bile in frog?

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Option C is the right answer. The liver cells or the hepatocytes secrete bile. The bile is stored in gall bladder.

Which among the mouth parts of cockroach act as tongue?

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Hypopharynx is a small, cylindrical mouth part that acts as tongue in cockroach. Hypopharynx lies within the cavity enclosed by the mouthparts (labrum,mandibles,maxillae and a labium). So, option B is the correct answer.

Cells of squamous epithelium are

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Cells of squamous epithelium are flattened scale like and attatched to each other like a mosaic.

The sensory receptors of earthworm are situated in the

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Epidermis and buccal cavity. Earthworms do not have visible sense organs. Receptors sensitive to light, touch and chemicals are present along the body.Earthworms have three types of receptors.Tactile or touch receptors in the epidermis. Chemoreceptors for taste and smell in the lining of the buccal cavity. Photoreceptors in the epidermis. Option A - Clitellum is not sensitive but secretory in function. Option C - The epidermis of prostomium is sensory in function. Option D - Peristomium has the opening to the buccal cavity, the lining of which is sensory in function.

Which of the following statement is not correct regarding neural tissue?

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Neurons, the unit of neural system are excitable cells while chondrocytes are cartilagenous cells.

Tendon is made up of -

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Tendon is made up of modified white fibrous tissue.

Locomotion in earthworm is affected by ____.

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The setae, the muscular wall and the lubricant provided by the wall. The setae in each segement work with the help of retractor and extensor muscles. The earthworms move by squeezing the circular muscles of each segment to make their body extend forward, then they grip the surface with their bristles and contract their longitudinal muscles so their body is pulled up to their anterior (front) end. The hydrostatic skeleton formed by the coelomic fluid counteracts the muscle movements. The slimy body wall acts as a lubricant to slide through burrows or soil. Options - A, B and C are incomplete answers.

Specialised functional connections exist between the cells of epithelial tissues to facilitate

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Facilitate communications between cells. Junctions facilitate exchange or communications between cells of ions, micromolecules or macromolcules. These junctions are known as Gap junctions. Option A - Preventing leakage are tight junctions. Option B - Cementing the cells are called Adhering junctions. Option D - Incorrect.

Class 11th Biology - 7 Structural Organisation in Animals MCQs
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Class 11th Biology - 7 Structural Organisation in Animals MCQs