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FY.Bsc. Paper I / Term II Zoology Chapter 3 – Study of Frog 1) Rana

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FY.Bsc. Paper I / Term II Zoology Chapter 3 – Study of Frog 1) Rana FY.Bsc. Paper I / Term II Zoology Chapter 3 – Study of Frog Multiple Choice Questions 1) Rana tigrina is a member of the order A) Lepospondyli B) Anura C) Apoda D) Urodela Answer is ‘B’ 2) The frog swims in water by: A) Powerful forward thrusts of its forelimbs. B) Powerful backward thrusts of its forelimbs. C) Powerful backward thrusts of its hind limbs. D) Powerful forward thrusts of its hind limbs Answer is ‘C’ 3) The tongue of frog is A) Short, protrusible and attached at the front end. 1 Sharp’s Notes FY.Bsc. Paper I / Term II Zoology B) Short, protrusible and attached at the distal end. C) Long, non-protrusible and attached at the front end. D) Long, protrusible and attached at the front end. Answer is ‘D’ 4) During hibernation or aestivation frog lives upon: A) Stored glycogen and fat. B) Stored glucose and fat. C) Stored starch and fat. D) Stored galactose and fat. Answer is ‘A’ 5) In frog, the sexual embrace between male and female is called: A) Spawning B) Swarming C) Aplexus D) Amplexus Answer is ‘D’ 6) Opening of rectum in frog is termed as A) Coccyx. B) Anus 2 Sharp’s Notes FY.Bsc. Paper I / Term II Zoology C) Cloaca D) Rectum Answer is ‘C’ 7) Teeth in frog are A) Acrodont B) Homodont C) Polyphyodont D) All of the above Answer is ‘D’ 8) The chief nitrogenous waste material in the urine of frog is A) Ammonia B) Uric acid C) Urea D) Trimethylamine Answer is ‘C’ 9) Which of the following differentiates male frog from female frog? A) External nares B) Brow spot C) Nuptial pad 3 Sharp’s Notes FY.Bsc. Paper I / Term II Zoology D) All of the above Answer is ‘C’ 10) Male frog can croak louder than females because being A) Stronger B) Larger in size C) Larger sound box D) Vocal sacs Answer is ‘D’ 11) Bidder’s canal is found in A) Kidney of male frog B) Kidney of frog C) Testis of frog D) Liver of frog Answer is ‘A’ 12) In frog tangoreceptors respond to A) Heat B) Touch C) Chemicals D) Smell 4 Sharp’s Notes FY.Bsc. Paper I / Term II Zoology Answer is ‘B’ 13) Some frogs hibernate during the winter and avoid the harmful effecting of freezing by accumulating and glycerol in their bodies A) Fat B) Thyroxine C) Sebum D) Glucose Answer is ‘D’ 14) The frog most commonly used in zoology laboratory for dissections, and is also the frog that has the widest distribution, belong to the genus. A) Genus Hyla B) Genus Bufo C) Genus Rana D) Genus Sirenia Answer is ‘C’ 15) Suitable breeding season in frog is A) Winter season B) Rainy season C) Spring season D) Summer season 5 Sharp’s Notes FY.Bsc. Paper I / Term II Zoology Answer is ‘B’ Answer the Following ( 2 Marks Q.1. Explain in short the habitat of Frog Ans: Frogs are non- poisonous , harmless and normally silent animals Frogs are found near water and in or near water (fresh water lakes, ponds and streams) and in very damp places of land. It lives in water, to keep the skin moist to carry on cutaneous respiration and to jump or slip into water to escape from enemies. Q.2. What is the food of the frog? Ans: Frogs are carnivores. Smaller frogs eat insects such as flies, mosquitoes, moths and dragonflies. Larger frogs will eat larger insects like grasshoppers and worms. Some large frogs will even eat small snakes, mice, baby turtles, and even other smaller frogs Most frogs will starve before they eat a dead insect or animal. 6 Sharp’s Notes FY.Bsc. Paper I / Term II Zoology Q.3.Define portal system (March – 2013) Ans: The veins, which start with capillaries in the organ from where they collect blood and then end or break up into capillaries in certain other organs, are known as portal veins, and this system is known as portal system. The name portal vein and the portal system portal is usually based upon the name of that particular organ into which it finally breaks up. In frog, there are two portal systems Renal portal system (ii) Hepatic portal system Q.4.What is a Nictitating membrane?( March – 2013) Ans: Nictitating membrane: The 'third eyelid', a thin, transparent fold of skin at the inner angle of the eye or below the lower eyelid that can be drawn across the eyeball for protection without obscuring vision This membrane closes over the eye whenever the frog is in or under the water. It can also flick across the eyes when the frog is out of the water, performing a useful function by cleansing and moistening the surface of the eye. Q.5. What is the Posture of the frog while floating in water?(March – 2013) Ans: 7 Sharp’s Notes FY.Bsc. Paper I / Term II Zoology When the water of pond is very deep, the frogs float on the surface. In the floating posture, the rest of the body lies quiet, hanging obliquely with the hind limb moderately extended with the nostrils above the water for breathing Q.6. Explain Anura( March -2011) Ans: Anura:(salientia; anurans, tail-less amphibians, frogs and toads; An order of amphibians in which the head joins directly into the trunk. The vertebral column is short and there is no tail in the adult. The fore limbs are stout and long, webbed. hind limbs are used for jumping and swimming. The eyes are large and high on the head. There are superficial ear membranes posterior to the eyes. All anurans lay eggs, have external fertilization, and develop from tailed tadpoles. There is no *neoteny. ‘Sexualdimorphism is common. The males often being smaller and having vocal pouches. There are 2600 species, widespread Iintropical and temperate zones. Answer the Following (5 Marks ) 8 Sharp’s Notes FY.Bsc. Paper I / Term II Zoology Q.7. Give the general characteristics of Amphibians Ans: General characters of Amphibians are: 1) Amphibians are cold blooded vertebrates which can live on land and in water. 2) Amphibians show four limbs with which they can swim in water and jump or walk on the land, (But In apoda limbs are absent.) 3) In Amphibians animals exoskeleton is absent. But in apoda animals small cycloid scales are present. 4) In Amphibians the adult animals lungs are present. Gills are absent. But In some urodelans the gills are present. 5) Amphibians Skin is a respiratory organ. 6) The Amphibians skull is dicondylic. 7) Amphibians Ribs are absent. 8) In Amphibians The body divisible into head and trunk Tail is present. 9) Amphibians Digestive system is well developed. A well developed liver Is present. 10) External ear is absent. Middle and inner ears are present, the middle ear columella auris Is present. 9 Sharp’s Notes FY.Bsc. Paper I / Term II Zoology 11) Amphibians Heart is 3 chambered with 2 auricles and 1 ventricle The blood contains R.B.C. They are nucleated. They contain hemoglobin. 12) Blood vascular system contain hepatic and renal portal systems. 13) Amphibians Kidneys are mesonephric. Urinary bladder is present. It stores urine. 14) Central nervous system is well developed. The brain occupies completely the cranial cavity. The brain is divided into fore, mid and hind brains. Brain continuous as spinal cord. 15) 10 pairs of cranial nerves will arise. 16) Sexes are separate. 17) Male and female can be indentified - Sexual dimorphism. 18) In Amphibians the life history a larva stage may be present. 19) Amphibian Eggs are telolecithal, Cleavage is holoblastic unequal. Q.8. Give the systematic position of frog Ans: Systematic position of frog: Phylum: Chordata Subphylum: Vertebrata Division: Gnathostomata Superclass: Tetrapoda Class: Amphibia 10 Sharp’s Notes FY.Bsc. Paper I / Term II Zoology Order: Anura Suborder- Diplasiocoela Family – Ranidae Type: Rana Tigrina Q.9. Describe the habits of frog. Ans: Some of the habits of frog are described below. 1) Locomotion: Frog moves in two ways (i) by leaping on land and by swimming in water. (i) Leaping: It jumps or leaps by extending the hind limbs, which act like springs throwing the body up into air. A frog may leap a distance of 1.5 to 2 meters in a single jump. On landing back the forelimbs act like shock absorber. The forelimbs also manipulate and adjust the direction of the jump. (ii)Swimming: The frog swims in water by powerful backward thrusts of its hind limbs which act like propellers. During their backward strokes, the toes are spread apart and the broad webs push against water, moving the body forward. 11 Sharp’s Notes FY.Bsc. Paper I / Term II Zoology 2) Feeding: Frogs are carnivorous and food consists mainly of living insects, worms, mollusks, and tadpoles. The food is not chewed but swallowed whole. 3) Croaking: The characteristics noise or sound made by frogs is known as croaking. It is commonly heard in breeding season which is a mating call. Frogs can croak under the water and on land. 4) Hibernation and aestivation: Body temperature of frogs fluctuates with environment. During adverse environmental conditions in cold winter or dry hot summer days, they burry in the soft damp bottom mud for protection. They become metabolically inactive and stop feeding, living on glycogen and fat stored in the body. This state of dormancy is called as hibernation, which occurs in winters and aestivation occurs in summers. 5) Camouflage: Frogs are not easily noticeable by their enemies as they can change the colour of their skin to match that of the environment.
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