IGCSE Biology Paper-4: Specimen Questions with Answers 196 - 197 of 279

Passage

A diagram of a mammalian heart and associated blood vessels is shown in Fig.

Structure of Heart

Question 196 (2 of 2 Based on Passage)

Write in Short

Short Answer▾

Table contains statements about the structures visible in Fig.

Complete Table by:

  • stating the name of each structure
  • identifying the structure with the corresponding letter from Fig.
Table Contains Statements About the Structures Visible
Statementname of structureletter from F
chamber that creates the highest blood pressure
blood vessel containing blood with the highest concentration of oxygen
structure that prevents blood going from ventricle to atrium
structure that prevents back flow of blood from artery to ventricle
chamber that receives blood from vena cava

Explanation

Table Contains Statements About the Structures Visible
Statementname of structureletter from Fig.
chamber that creates the highest blood pressureLeft ventricleF
blood vessel containing blood with the highest concentration of oxygenPulmonary veinR
structure that prevents blood going from ventricle to atriumBicuspid and tricuspid valveT
structure that prevents back flow of blood from artery to ventricleBicuspid and tricuspid valveT
chamber that receives blood from vena cavaRight atriumC

Question 197

Write in Short

Short Answer▾

Shows the skulls of a tiger and a rabbit.

Tiger and Rabbit Teeth

State two ways in which the teeth of a tiger differ from the teeth of a rabbit, using evidence from Fig.

Explanation

Rabbits have four incisors, two on the top, and two on the bottom. Right behind the top incisor teeth are two small peg-like teeth called auxiliary incisors or “peg teeth.” In addition, rabbits have cheek teeth that they use to grind their food. These are the 6 upper premolars, the 4 lower premolars, 6 upper molars and 6 lower molars. Canines are absent in rabbit.

A Rabbit՚S Skull

Tigers have 30 teeth. The canine teeth of the tiger are larger than those of any of the other wild cats, reaching lengths of almost 10 centimeters. These teeth are very sensitive, filled with neural receptors and enabling the tiger to kill its prey quickly and effectively. This reduces the suffering of the prey as well as the amount of energy that the tiger needs to invest in each kill. Then, the back teeth (carnassials) slice the meat off the carcass of the catch.

The Canine Teeth of the Tiger