IGCSE Biology Paper-3: Specimen Questions with Answers 306 - 307 of 358

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Passage

The diagram shows the male reproductive system.

Using a Label Line

Question 306 (2 of 2 Based on Passage)

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Short Answer▾

Describe two secondary characteristics regulated by testosterone.

Explanation

Secondary sexual characteristics are those sexually dimorphic characteristics that are not directly involved in reproduction. For males, secondary characteristics include facial and chest hair, increased body hair, pelvic build (lack of rounded hips) , upper body muscular build, and the ability to generate muscle mass at a faster rate than the female. For females, secondary sex characteristics include relative lack of body hair, thicker hair on the head (in some cases) , rounded hips/figure, a decreased ability to generate muscle mass at a fast rate, decreased upper body strength, breasts, ability to nurse children, a menstrual cycle, and increased body fat composition.

Question 307

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Short Answer▾

Table shows some of the structures and parts of the alimentary canal and associated organs.

Complete Table by identifying the five missing structures and functions.

Identifying the Five Missing Structures and Functions
structurefunction
where most absorption occur
salivary glands
where egestion occurs
gall bladder
where ingestion occurs

Explanation

Identifying the Five Missing Structures and Functions
structurefunction
Small intestinewhere most absorption occur
salivary glandsSecrete saliva
From Anuswhere egestion occurs
gall bladderRelease bile
From mouthwhere ingestion occurs
  • Function of small intestine: Small intestine is chiefly involved in the digestion and absorption of nutrients. It receives pancreatic secretions and bile through the hepatopancreatic duct which aid with its functions.
  • Function of salivary glands: Salivary glands play an important role in digestion because they make saliva. Saliva helps moisten food so we can swallow it more easily. It also has an enzyme called amylase that makes it easier for the stomach to break down starches in food. Saliva also has an important role in our oral health.
  • Function of anus: The anus is the last part of the digestive tract. It is a 2-inch long canal consisting of the pelvic floor muscles and the two anal sphincters (internal and external) . The lining of the upper anus can detect rectal contents. It is involved in egestion.
  • Function of Gall bladder: The gallbladder is a pear-shaped, hollow structure located under the liver and on the right side of the abdomen. Its primary function is to store and concentrate bile, a yellow-brown digestive enzyme produced by the liver. The gallbladder is part of the biliary tract.
  • Function of mouth: The two main functions of the mouth are eating and speaking. The face՚s trigeminal nerve provides sensation (feeling) and helps us to bite, chew and swallow.

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