Structural Organization in Animals Chapter-Wise Test 6

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about the frog’s circulatory system is correct?

Frogs have a three-chambered heart.
Frogs have a four-chambered heart like mammals.
Frogs exhibit single circulation like fish.
Blood flows through an open circulatory system.
1

Frogs have a three-chambered heart consisting of two atria and one ventricle, allowing partial mixing of oxygenated and deoxygenated blood.

Which of the following statements about frog reproduction is correct?

Fertilization in frogs is internal.
Male frogs release sperm over eggs externally.
Frogs reproduce through budding.
Female frogs store fertilized eggs inside their body.
2

Frogs undergo external fertilization where male frogs release sperm over eggs laid by females in water.

What is the function of the cloaca in frogs?

Digestion
Excretion and reproduction
Hearing
Gas exchange
2

The cloaca in frogs is a common chamber for excretion, reproduction, and digestive waste removal.

Which of the following statements about frog respiration is incorrect?

Frogs respire through their skin in water.
Frogs rely on buccal respiration when hibernating.
Frogs use their lungs for respiration on land.
Frogs continue to use gills throughout their life.
4

Frogs use gills only during the larval stage. Adult frogs rely on lungs, skin (cutaneous respiration), and buccal respiration.

Which blood vessels carry deoxygenated blood to the frog’s heart?

Pulmonary veins
Carotid arteries
Vena cava
Systemic arteries
3

The vena cava collects deoxygenated blood from the body and delivers it to the right atrium of the frog’s heart.

Which of the following statements about the frog’s circulatory system is incorrect?

Frogs have a three-chambered heart.
The ventricle pumps only oxygenated blood to the body.
Frogs have both pulmonary and systemic circulation.
Blood is circulated through a closed circulatory system.
2

The ventricle in frogs pumps mixed blood (both oxygenated and deoxygenated) to the body.

Which of the following statements about frog locomotion is incorrect?

Frogs use their hind limbs for jumping.
Frogs have webbed feet that help in swimming.
Frogs move using only their forelimbs.
Frogs can leap long distances due to strong leg muscles.
3

Frogs primarily use their powerful hind limbs, not just their forelimbs, for movement, jumping, and swimming.

Which structure in frogs receives blood from the body and directs it to the right atrium?

Sinus venosus
Conus arteriosus
Ventricle
Pulmonary veins
1

The sinus venosus is a triangular structure that receives deoxygenated blood from the body and directs it to the right atrium.

Which structure in the frog prevents food from entering the windpipe during swallowing?

Glottis
Epiglottis
Esophagus
Nictitating membrane
1

The glottis in frogs prevents food from entering the trachea during swallowing.

Which of the following statements about the frog’s heart is incorrect?

Frogs have a three-chambered heart.
Frogs have two ventricles and one atrium.
The heart pumps mixed oxygenated and deoxygenated blood.
The circulatory system in frogs is closed.
2

Frogs have one ventricle and two atria, not two ventricles and one atrium.

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