Biology past paper questions and correct answers

Biology past paper questions and answers. "what is the process in which water is absorbed into plant roots? - CORRECT ANSWER Osmosis" "Two uses of water in plants? - CORRECT ANSWER translocation photosynthesis" "Why is there a higher body temperature during movement? - CORRECT ANSWER movement requires energy through respiration respiration generates heat which in turn heats the body" "how does vasodilation decrease body temp? - CORRECT ANSWER the blood flows closer to the surface of the skin so heat is lost from blood through radiation cold blood cools the body down" "why should athletes take salt tablets? - CORRECT ANSWER replaces salt lost during sweating" "light causes auxin to... - CORRECT ANSWER move to the side with least light intensity" "What is the male gamete in flowering plants? - CORRECT ANSWER Pollen" "What are abiotic factors? - CORRECT ANSWER Nonliving components of environment." "What are biotic factors? - CORRECT ANSWER Living factors of the environment e.g. diseases" "effect of high concentration of insulin in blood ... - CORRECT ANSWER Decreases blood glucose levels converts glucose into Glycogen by cells/liver/muscles" "What diet is required to reduce risk of developing type 2 diabetes? - CORRECT ANSWER Low carbs/ low sugars : controlled diet" "Give four substances that can cause water pollution? - CORRECT ANSWER Fertiliser/pesticides sewage oil faeces" "Why does the blood have a high concentration of toxic substances if it lacks the particular enzyme? - CORRECT ANSWER Toxic substance not broken down causes buildup over time which travels to blood from cells through osmosis" "Why may the urine contain high levels of toxic substances? - CORRECT ANSWER toxic substance is diffused out of blood and filtered through kidneys The substance is then not reabsorbed" "Why might a low protein diet be used ? - CORRECT ANSWER Proteins break down to form amino acids so having a low protein diet helps reduce buildup of amino acids leading to decrease damage of the cells" "Why is it more energy efficient to rear cows indoors? - CORRECT ANSWER less energy lost due to heat less energy lost due to movement" "two disadvantages of rearing cows indoors? - CORRECT ANSWER it is expensive for feeding it increases the likelihood for spread of disease" "What is a mutation? - CORRECT ANSWER change in DNA sequence "What are abiotic factors? - CORRECT ANSWER Nonliving components of environment." "What are biotic factors? - CORRECT ANSWER Living factors of the environment e.g. diseases"