Structural Organization in Animals
Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following organs in a frog is responsible for bile secretion?

Stomach
Gall bladder
Liver
Pancreas
3

The liver secretes bile, which is stored in the gall bladder before being released into the duodenum.

Which gland in frogs is responsible for regulating metamorphosis?

Thyroid gland
Pituitary gland
Pancreatic islets
Adrenal glands
1

The thyroid gland secretes hormones that regulate metamorphosis in frogs, helping tadpoles develop into adults.

Which organ system in frogs is responsible for maintaining water balance and excreting nitrogenous wastes?

Respiratory system
Circulatory system
Excretory system
Digestive system
3

The excretory system in frogs, consisting of kidneys, ureters, cloaca, and urinary bladder, maintains water balance and excretes nitrogenous wastes.

Which of the following organ systems in frogs is involved in osmoregulation?

Nervous system
Endocrine system
Excretory system
Respiratory system
3

The excretory system, including kidneys and urinary bladder, regulates water balance in frogs.

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

Frogs have a short alimentary canal suited for carnivorous feeding.
The stomach opens directly into the cloaca without an intestine.
The pancreas secretes digestive enzymes.
The liver secretes bile, which aids in digestion.
2

The stomach does not open directly into the cloaca; food passes through the intestine for digestion and absorption.

Which of the following statements about frog respiration is incorrect?

Frogs respire through lungs on land.
Buccal respiration occurs when frogs are inactive.
Frogs continue to use gills throughout their life.
Cutaneous respiration allows gas exchange through the skin.
3

Frogs use gills only during their larval (tadpole) stage; adults rely on lungs, skin, and buccal respiration.

Which structure in a male frog helps in sound production?

Cloaca
Vocal sacs
Tympanum
Larynx
2

Male frogs have vocal sacs that amplify their mating calls.

Which part of the frog’s brain controls voluntary actions?

Medulla oblongata
Cerebellum
Cerebrum
Optic lobes
3

The cerebrum is responsible for voluntary actions and higher neural functions in frogs.

Which blood pigment is responsible for oxygen transport in frogs?

Chlorocruorin
Haemocyanin
Hemoglobin
Myoglobin
3

Hemoglobin, present in frog’s RBCs, binds to oxygen and transports it throughout the body.

Which of the following statements about frog circulation is incorrect?

Frogs have a three-chambered heart.
The heart of a frog has two atria and one ventricle.
Frogs have a single circulatory system like fish.
Frogs have a closed circulatory system.
3

Frogs have a double circulatory system, unlike fish, which have a single circulatory system.

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