NEET Biology Plasmodium and Frog MCQs Set 01

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Chapter-wise Objective Questions: Plasmodium and Frog

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Multiple Choice Questions

Question 1: The functional kidney of an adult frog is
(a) Pronephric
(b) Mesonephric
(c) Metanephric
(d) Absent
Show Answer & Explanation

Answer: (b) Mesonephric

Explanation:
1. Adult frogs have mesonephric kidneys.
2. The pronephros works only in the tadpole stage and metanephros occurs in reptiles, birds and mammals.

Teacher's Note:
1. Fishes and amphibians have mesonephros.
2. Amniotes have metanephros.

Question 2: Which of the following is a function of the kidney in the frog?
(a) Excretion
(b) Osmoregulation
(c) Haemopoiesis in the larva
(d) All of the above
Show Answer & Explanation

Answer: (d) All of the above

Explanation:
1. The frog kidney excretes urea, regulates water and salt balance and in the tadpole also forms blood cells.
2. So all three functions are correct.

Teacher's Note:
1. Tadpole kidney is haemopoietic.
2. Frogs are ureotelic.

Question 3: The cortex and medulla regions in the frog kidney are
(a) Less distinct
(b) More distinct
(c) Absent
(d) Present in two layers
Show Answer & Explanation

Answer: (c) Absent

Explanation:
1. The frog kidney is a simple, flat organ with no cortex, medulla or pyramids.
2. These are mammalian features.

Teacher's Note:
1. Mammals have renal pyramids and distinct cortex and medulla.

Question 4: The number of pyramids in the kidney of a frog is
(a) Two
(b) Five
(c) Ten
(d) Absent
Show Answer & Explanation

Answer: (d) Absent

Explanation:
1. Frog kidneys have no medullary pyramids.
2. They are made of simple nephrons.

Teacher's Note:
1. No pyramids, no cortex, no medulla.

Question 5: The lower jaw is toothless in
(a) Cockroach
(b) Man
(c) Rabbit
(d) Frog
Show Answer & Explanation

Answer: (d) Frog

Explanation:
1. The frog has maxillary and vomerine teeth on the upper jaw only.
2. The lower jaw is toothless.

Teacher's Note:
1. Teeth are present only on the upper jaw in frogs.

Question 6: A three-chambered heart is found in
(a) Frog
(b) Butterfly
(c) Crocodile
(d) Fish
Show Answer & Explanation

Answer: (a) Frog

Explanation:
1. The frog heart has two atria and one ventricle.
2. The crocodile heart is four-chambered and fish hearts are two-chambered.

Teacher's Note:
1. Amphibians and most reptiles have three chambers.

Question 7: The dorsal part of the frog is ..... and the ventral part is .....
(a) Olive green, uniformly pale yellow
(b) Olive green, non-uniformly pale yellow
(c) Olive green, non-uniformly dark yellow
(d) Olive green, uniformly dark yellow
Show Answer & Explanation

Answer: (a) Olive green, uniformly pale yellow

Explanation:
1. The dorsal side is olive green with dark irregular spots.
2. The ventral side is uniformly pale yellow.

Teacher's Note:
1. Colour helps in camouflage.

Question 8: The summer sleep of the frog is called
(a) Hibernation
(b) Aestivation
(c) Both
(d) None
Show Answer & Explanation

Answer: (b) Aestivation

Explanation:
1. Aestivation is the dormancy during hot, dry summer.
2. Hibernation is the winter sleep.

Teacher's Note:
1. Frogs are cold-blooded and avoid extremes.

Question 9: The frog belongs to the order
(a) Urodela
(b) Apoda
(c) Caudata
(d) Anura
Show Answer & Explanation

Answer: (d) Anura

Explanation:
1. Frogs and toads lack a tail as adults and belong to Anura.
2. Urodela has tailed amphibians and Apoda has limbless caecilians.

Teacher's Note:
1. An-oura means without tail.

Question 10: The glands present in the skin of the frog are
(a) Mucous and poisonous
(b) Sweat and mammary
(c) Sweat and sebaceous
(d) Mucous and sweat
Show Answer & Explanation

Answer: (a) Mucous and poisonous

Explanation:
1. The frog skin has mucous glands, which keep it moist, and granular (poison) glands.
2. Sweat, sebaceous and mammary glands belong to mammals.

Teacher's Note:
1. Moist skin helps cutaneous respiration.

Question 11: Which of the following traits is NOT characteristic of the frog?
(a) Thin, scaleless skin
(b) Aquatic reproduction
(c) Amniote egg
(d) Cutaneous respiration
Show Answer & Explanation

Answer: (c) Amniote egg

Explanation:
1. Frog eggs are anamniotic and laid in water.
2. They have no amnion or shell.

Teacher's Note:
1. Amniotes: reptiles, birds, mammals.

Question 12: A frog lives in water or near water because
(a) It can get its food easily in water
(b) Its hind limbs are webbed and help in swimming
(c) It can see through its transparent eyelids while swimming
(d) It respires through the skin, which must remain moist
Show Answer & Explanation

Answer: (d) It respires through the skin, which must remain moist

Explanation:
1. Cutaneous respiration requires a moist skin.
2. So the frog stays near water.

Teacher's Note:
1. Skin must be wet for diffusion of gases.

Question 13: The frog belongs to the amphibians because
(a) Its tail is not found in it
(b) Lungs are found in it
(c) Its tadpoles are aquatic in nature
(d) It lives in water as well as on land
Show Answer & Explanation

Answer: (d) It lives in water as well as on land

Explanation:
1. Amphibia means living a double life, in water and on land.
2. The other options are not defining features.

Teacher's Note:
1. Amphi = both, bios = life.

Question 14: Which of the following is found in the frog?
(a) Five fingers and four toes
(b) Four fingers and five toes
(c) Five fingers and five toes
(d) Four fingers and four toes
Show Answer & Explanation

Answer: (b) Four fingers and five toes

Explanation:
1. The forelimb has four digits and the hind limb has five digits.
2. The hind limb is webbed.

Teacher's Note:
1. Digital formula of fore and hind limbs differ.

Question 15: The third eyelid in the frog is called
(a) Pineal eye
(b) Lower eyelid
(c) Nictitating membrane
(d) Upper eyelid
Show Answer & Explanation

Answer: (c) Nictitating membrane

Explanation:
1. The transparent nictitating membrane protects the eye under water.
2. It is the third eyelid.

Teacher's Note:
1. Upper and lower eyelids are also present.

Question 16: The liquefied semidigested acidic food in the stomach is known as
(a) Bile
(b) Bolus
(c) Chyme
(d) Faeces
Show Answer & Explanation

Answer: (c) Chyme

Explanation:
1. Chyme is the partially digested, acidic semi-fluid mass leaving the stomach.
2. Bolus is the food in the mouth.

Teacher's Note:
1. Chyme passes into the duodenum.

Question 17: Air enters the lungs of the frog through the
(a) Skin
(b) Buccal cavity
(c) Mouth
(d) Cloaca
Show Answer & Explanation

Answer: (b) Buccal cavity

Explanation:
1. Air enters through the external nostrils into the buccal cavity and is forced into the lungs through the glottis.
2. The skin and cloaca are not part of the air passage.

Teacher's Note:
1. Frogs gulp air into the buccal cavity.

Question 18: The kidneys in the adult frog are
(a) Pronephric
(b) Metanephric
(c) Mesonephric
(d) All of these
Show Answer & Explanation

Answer: (c) Mesonephric

Explanation:
1. Adult frogs have mesonephric kidneys.
2. The pronephros is functional only in the larva.

Teacher's Note:
1. Mesonephros: fishes and amphibians.

Question 19: The vasa efferentia in the male frog open into
(a) Vas deferens
(b) Bidder's canal
(c) Cloaca
(d) Urinogenital duct
Show Answer & Explanation

Answer: (b) Bidder's canal

Explanation:
1. About 10 to 12 vasa efferentia leave the testis and enter Bidder's canal in the kidney.
2. From there sperms pass to the urinogenital duct.

Teacher's Note:
1. Bidder's canal is a longitudinal duct along the kidney.

Question 20: A frog's heart taken out of the body continues to beat for some time. The best explanation is (a) frog is a poikilotherm, (b) frog has no coronary circulation, (c) heart is myogenic, (d) heart is autoexcitable. The best option is
(a) Only (d)
(b) (a) and (b)
(c) (c) and (d)
(d) Only (c)
Show Answer & Explanation

Answer: (c) (c) and (d)

Explanation:
1. The frog heart is myogenic and autoexcitable because the sinus venosus, its pacemaker, generates the impulse by itself.
2. Being poikilothermic and lacking coronary vessels does not explain continued beating.

Teacher's Note:
1. Myogenic hearts beat without nerve impulses.
2. Sinus venosus is the pacemaker.

Question 21:
Assertion (A): Urine, faeces and gametes pass through a common passage in the frog.
Reason (R): The frog has a cloaca into which the alimentary canal and the urinogenital duct open.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (a) Both A and R are true, and R is the correct explanation of A.

Explanation:
1. Both statements are true.
2. The cloaca is the common chamber, so R explains A.

Teacher's Note:
1. Cloaca is also found in birds and reptiles.

Question 22:
Assertion (A): Male frogs have a copulatory (nuptial) pad on the pollex of the forelimbs.
Reason (R): It helps in amplexus.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (a) Both A and R are true, and R is the correct explanation of A.

Explanation:
1. Both statements are true.
2. The nuptial pad gives the male a firm grip of the female during amplexus, so R explains A.

Teacher's Note:
1. Pads appear in the breeding season on the first digit.
2. Amplexus is the clasping of the female.

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