Structural Organisation in Animals MCQs

Consider the following statements regarding stomach digestion and chemical processes in the frog:

I. Digestion of food takes place by the action of HCl and gastric juices secreted from the walls of the stomach.
II. Partially digested food is called chyme.
III. Chyme is passed from the stomach to the first part of the small intestine, the duodenum.
IV. Duodenum receives bile from the liver and pancreatic juices from the gall bladder.

Which of the above statements are correct?

Consider the following statements regarding duodenal ducts and absorption in the intestine:

I. The duodenum receives bile and pancreatic juice through a common bile duct.
II. Bile emulsifies fat, and pancreatic juices digest carbohydrates and proteins.
III. Final digestion of food takes place in the stomach.
IV. Digested food is absorbed by finger-like folds in the inner wall of the intestine called villi and microvilli.

Which of the above statements are correct?

Analyze the following statements regarding the respiratory modes of the frog:

I. In water, skin acts as an aquatic respiratory organ (cutaneous respiration).
II. Dissolved oxygen in water is exchanged through the skin by active transport.
III. Gaseous exchange across the skin in water occurs by diffusion.
IV. On land, the buccal cavity, skin, and lungs act as the respiratory organs.

Which of the above statements are correct?

Consider the following statements regarding the structural features of the frog's lungs:

I. Respiration by lungs is called pulmonary respiration.
II. Lungs are a pair of elongated, pink coloured sac-like structures.
III. Lungs are situated in the lower abdominal cavity of the frog.
IV. Lungs are present in the upper part of the trunk region (thorax).

Which of the above statements are correct?

Consider the following statements regarding the vascular structures and covering of the frog's heart:

I. The vascular system of the frog is a well-developed, closed type.
II. The lymphatic system consists of lymph, lymph channels, and lymph nodes.
III. The heart is covered by a membrane called the pericardium.
IV. The heart has three chambers: one atrium and two ventricles.

Which of the above statements are correct?

Analyze the following statements regarding the auxiliary chambers of the frog's heart:

I. A triangular structure called sinus venosus joins the right atrium.
II. Sinus venosus receives blood through the major veins called vena cava.
III. The ventricle opens into a sac-like conus arteriosus on the ventral side of the heart.
IV. The ventricle opens into a conus arteriosus on the dorsal side of the heart.

Which of the above statements are correct?

Consider the following statements regarding systemic circulation and portal connections in frogs:

I. Blood from the heart is carried to all parts of the body by the arteries (arterial system).
II. Veins collect blood from different parts of the body to the heart, forming the venous system.
III. The hepatic portal system is a special venous connection between the liver and intestine.
IV. The renal portal system is a special venous connection between the kidney and the liver.

Which of the above statements are correct?

Consider the following statements regarding the excretory organs of the frog:

I. The excretory system consists of a pair of kidneys, ureters, cloaca, and urinary bladder.
II. Kidneys are compact, dark red, and bean-like structures.
III. Kidneys are situated anteriorly in the body cavity.
IV. Kidneys are situated a little posteriorly in the body cavity on both sides of the vertebral column.

Which of the above statements are correct?

Analyze the following statements regarding sex-specific excretory ducts and bladder positioning:

I. In male frogs, two ureters emerge from kidneys and act as urinogenital ducts opening into the cloaca.
II. In female frogs, ureters and oviducts open separately in the cloaca.
III. A thin-walled urinary bladder is situated dorsal to the rectum.
IV. The thin-walled urinary bladder is situated ventral to the rectum and opens into the cloaca.

Which of the above statements are correct?

Consider the following statements regarding the control, coordination, and brain divisions in frogs:

I. Brain is enclosed in a bony structure called the brain box or cranium.
II. There are ten pairs of cranial nerves arising from the brain.
III. Fore-brain includes olfactory lobes, paired cerebral hemispheres, and unpaired diencephalon.
IV. The mid-brain is characterized by a pair of optic lobes.

Which of the above statements are correct?