Tag igcse biology
1. Food chain and food webs: Which of the organisms in this food web gets energy from both producers and consumers? Shrimp The shrimp gets energy from both the snail and algae. What organism is a primary consumer in the… Continue Reading →
Fermentation: Which of the following statements about bread making is correct? Bread is made with the help of ethanol fermentation. Bread dough has yeast in it, which carries out ethanol fermentation to release carbon dioxide. When the bread is baked,… Continue Reading →
Structure of DNA and RNA: DNA packaging: The image below depicts different levels of DNA packaging. Among the above structures, non-histone chromosomal (NHC) proteins in order to enable efficient packaging of DNA into D. If D is a chromosome, what structure does… Continue Reading →
Malaria and Plasmodium life cycle The Plasmodium protozoan undergoes different stages of development in its human and mosquito hosts. Match the event/stage of life cycle with the site at which it occurs. Event Site Initial multiplication of sporozoites in humans Liver cells… Continue Reading →
Which structures produce the male gametes? Testes The testes produce sperm, as well as the male sex hormone, testosterone. The structures labeled B are vas deferens, which transfer sperm from the epididymis Structure C is the urethra. It allows both… Continue Reading →