Chapter 7: Structural Organisation in Animals Assertion-Reason Questions | biology Class 11 CBSE

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Chapter 7: Structural Organisation in Animals Assertion-Reason Questions | biology Class 11 CBSE | ByteNotes.in

Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 1

Logic Check

Assertion (A): Frogs are called poikilotherms. Reason (R): The body temperature of frogs varies with the temperature of the surrounding environment.

Reasoning Options

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Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 2

Logic Check

Assertion (A): Frogs undergo aestivation during peak summer. Reason (R): Frogs are warm-blooded animals that generate their own body heat to survive summer.

Reasoning Options

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Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 3

Logic Check

Assertion (A): The skin of a frog is always maintained in a moist condition. Reason (R): Moist skin is essential for cutaneous respiration and water absorption in frogs.

Reasoning Options

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Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 4

Logic Check

Assertion (A): The frog never drinks water. Reason (R): The frog obtains all required water by absorbing it through its moist, permeable skin.

Reasoning Options

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Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 5

Logic Check

Assertion (A): The alimentary canal of frogs is short. Reason (R): Frogs are carnivores and animal-based food is digested more quickly than plant material, requiring a shorter intestinal length.

Reasoning Options

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Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 6

Logic Check

Assertion (A): The tympanum in frogs functions only as an organ of hearing. Reason (R): In frogs, the ear (tympanum with internal ear) serves as an organ of both hearing and balance (equilibrium).

Reasoning Options

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Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 7

Logic Check

Assertion (A): The frog's heart has three chambers. Reason (R): The frog's heart has two atria and one ventricle and is enclosed by the pericardium.

Reasoning Options

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Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 8

Logic Check

Assertion (A): Frogs are ureotelic animals. Reason (R): Frogs excrete urea as their primary nitrogenous waste product.

Reasoning Options

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Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 9

Logic Check

Assertion (A): Male frogs possess a copulatory pad on the first digit of the forelimb. Reason (R): This pad helps the male frog grip the female during mating and is absent in female frogs.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 10

Logic Check

Assertion (A): The RBCs of frogs are nucleated. Reason (R): Nucleated RBCs in frogs contain haemoglobin and are therefore able to carry oxygen in the blood.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 11

Logic Check

Assertion (A): During hibernation, frogs rely solely on pulmonary respiration for gaseous exchange. Reason (R): During hibernation, frogs are buried in burrows and cutaneous respiration through the skin becomes the only mode of gaseous exchange.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 12

Logic Check

Assertion (A): The sinus venosus in frogs joins the right atrium. Reason (R): The sinus venosus receives blood from the major veins called the vena cava.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 13

Logic Check

Assertion (A): Bile emulsifies fats in the duodenum of frogs. Reason (R): Bile is secreted by the pancreas and reaches the duodenum through the common bile duct.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 14

Logic Check

Assertion (A): The lymph in frogs lacks red blood cells and a few proteins. Reason (R): Lymph is therefore identical in composition to blood plasma.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 15

Logic Check

Assertion (A): The vascular system of frogs is of the closed type. Reason (R): In a closed vascular system, blood circulates entirely within blood vessels and is never in direct contact with body tissues.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 16

Logic Check

Assertion (A): In male frogs, the ureter functions as the urinogenital duct. Reason (R): In female frogs, the ureter and oviduct are the same structure opening into the cloaca via a common duct.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 17

Logic Check

Assertion (A): Each kidney of the frog is composed of nephrons. Reason (R): Nephrons are the structural and functional units of the kidney that filter blood and produce urine.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 18

Logic Check

Assertion (A): The forebrain of the frog contains the optic lobes. Reason (R): The midbrain of the frog is characterised by a pair of optic lobes.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 19

Logic Check

Assertion (A): Fertilisation in frogs is external and takes place in water. Reason (R): Development in frogs involves a larval stage called the tadpole, which undergoes metamorphosis to form the adult.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 20

Logic Check

Assertion (A): The cloaca in frogs is a common passage for digestive, excretory and reproductive products. Reason (R): The cloaca opens to the exterior through the cloacal aperture and receives the rectum, urinary bladder and reproductive ducts.

Reasoning Options

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Chapter 7: Structural Organisation in Animals | Assertion-Reason

Assertion (A): Frogs are called poikilotherms. Reason (R): The body temperature of frogs varies with the temperature of the surrounding environment.

Assertion (A): Frogs undergo aestivation during peak summer. Reason (R): Frogs are warm-blooded animals that generate their own body heat to survive summer.

Assertion (A): The skin of a frog is always maintained in a moist condition. Reason (R): Moist skin is essential for cutaneous respiration and water absorption in frogs.

Assertion (A): The frog never drinks water. Reason (R): The frog obtains all required water by absorbing it through its moist, permeable skin.

Assertion (A): The alimentary canal of frogs is short. Reason (R): Frogs are carnivores and animal-based food is digested more quickly than plant material, requiring a shorter intestinal length.

Assertion (A): The tympanum in frogs functions only as an organ of hearing. Reason (R): In frogs, the ear (tympanum with internal ear) serves as an organ of both hearing and balance (equilibrium).

Assertion (A): The frog's heart has three chambers. Reason (R): The frog's heart has two atria and one ventricle and is enclosed by the pericardium.

Assertion (A): Frogs are ureotelic animals. Reason (R): Frogs excrete urea as their primary nitrogenous waste product.

Assertion (A): Male frogs possess a copulatory pad on the first digit of the forelimb. Reason (R): This pad helps the male frog grip the female during mating and is absent in female frogs.

Assertion (A): The RBCs of frogs are nucleated. Reason (R): Nucleated RBCs in frogs contain haemoglobin and are therefore able to carry oxygen in the blood.

Assertion (A): During hibernation, frogs rely solely on pulmonary respiration for gaseous exchange. Reason (R): During hibernation, frogs are buried in burrows and cutaneous respiration through the skin becomes the only mode of gaseous exchange.

Assertion (A): The sinus venosus in frogs joins the right atrium. Reason (R): The sinus venosus receives blood from the major veins called the vena cava.

Assertion (A): Bile emulsifies fats in the duodenum of frogs. Reason (R): Bile is secreted by the pancreas and reaches the duodenum through the common bile duct.

Assertion (A): The lymph in frogs lacks red blood cells and a few proteins. Reason (R): Lymph is therefore identical in composition to blood plasma.

Assertion (A): The vascular system of frogs is of the closed type. Reason (R): In a closed vascular system, blood circulates entirely within blood vessels and is never in direct contact with body tissues.

Assertion (A): In male frogs, the ureter functions as the urinogenital duct. Reason (R): In female frogs, the ureter and oviduct are the same structure opening into the cloaca via a common duct.

Assertion (A): Each kidney of the frog is composed of nephrons. Reason (R): Nephrons are the structural and functional units of the kidney that filter blood and produce urine.

Assertion (A): The forebrain of the frog contains the optic lobes. Reason (R): The midbrain of the frog is characterised by a pair of optic lobes.

Assertion (A): Fertilisation in frogs is external and takes place in water. Reason (R): Development in frogs involves a larval stage called the tadpole, which undergoes metamorphosis to form the adult.

Assertion (A): The cloaca in frogs is a common passage for digestive, excretory and reproductive products. Reason (R): The cloaca opens to the exterior through the cloacal aperture and receives the rectum, urinary bladder and reproductive ducts.

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