Biology paper 1: Exam practice paper with merged Correct Answers for Recent Updates

Name a specialised feature of a nerve cell explaining how it contributes to the rapid signaling of electrical impulses - AnsIt has a long axon carrying impulse over long distances What is transpiration - AnsLoss of water from leaf plants How is a colony of bacteria formed - Anspouring hot molten agar into sterile Petri dishes Describe two ways the root is adapted to absorb water efficiently. - AnsRoot hair absorbing water by osmosis surface area What does the heart being a double pump Mean - Ansblood passes through the heart twice per circuit Explain how CHD can cause a heart attack. - Ans1. Restricted blood flow through coronary arteries so not enough oxygen reaches heart muscle2. So not enough aerobic respiration / energy released How does oxygen enter a single-celled organism? - Ansdiffusion Which blood vessel carries deoxygenated blood away from the heart to the lungs? - Ansright ventricle What is differentiation? - Ansthe process by which cells becoming specialised why do root hair cells contain lots of mitochondria - Ansto produce lots of energy for active transport of mineral ions name 3 features of plant cells, also not in bacterial cells - Ansnucleus, mitochondria and chloroplast What's an advantage of using an electron microscope - AnsHigher magnification Give 2 advantages of using stem cells - Ans-Embryonic - stem cells be able to treat conditions by dividing to replace damaged cells -Adult - stem cells can differentiate into different cell types to replace dead/damaged tissues Why is it important to sterilise the culture medium and apparatus before use - Ansthousands of bacteria start reproducing so it has to be sterilized quickly before the microbes affect the nutrients Why can petri dishes not be incubated at temperature higher than 25 degrees - Ansto reduce the chances of growing harmful pathogens which can lead to various disease Why do children with different embryos do not look identical - Ansecause these are different eggs and different sperm describe 2 ways the root is adapted to absorb water efficiently - Anshas root hairs and large surface area explain why breathing rate changes from doing diff activities - Ansbreathing rate 2x when walking rather than at rest breathing rating 5x when jogging rather than at rest Why may people object using embryos - Ansthey believe they are apart of human life Why do human skin cells need to divide - AnsFor repair and growth What can human stem cells treat - Ansmedical conditions, diseases affecting plants and animals. Why do tools need disinfecting after using on plants with tmv - Ansto reduce the spread of plant diseases Why do plants with tmv have stunted growth - AnsThe plant does not produce as much glucose What is meosis - Ansreproduction of gametes Name one source of human stem cells other than human embryos - AnsBone marrow How can sexual reproduction produce a new variety of an onio