Edexcel International Gcse Biology Gcse A Level-Books Pdf

Edexcel International GCSE Biology GCSE A Level
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Answer ALL questions, 1 The following organisms can be classified into major groups. Amoeba Lactobacillus bean Mucor mosquito, a From the list above give the name of. i a bacterium, ii a fungus, iii a flowering plant, iv an animal. b Viruses are not included in most classification systems. i Give three ways in which viruses differ from other living organisms. ii Give one example of a disease caused by a virus name the organism it infects. and describe its effect on the organism, Organism infected. Total for Question 1 10 marks, P40124A0228, 2 The following passage describes inheritance.
Complete the passage by writing a suitable word or words on each dotted line. A gene is a section of a double stranded molecule known as. This molecule is found within the of the cell, contained in threadlike structures called. The two strands form a double helix linked by a series of paired bases. The base adenine is always linked to and the base cytosine. is always linked to, Sometimes the genetic material of a cell changes This is known as a. These changes occur very rarely but their incidence can be increased by chemicals or ionising. Total for Question 2 6 marks, P40124A0328 Turn over. 3 Frances likes to spend time in her garden She grows many different types of flowering plants. a Explain how each of the following factors could affect the growth of a flowering plant. i Height of the parent plants, ii Microorganisms in the soil. b Frances says that she likes to keep her grass lawn free of weeds. i Suggest what Frances means by the word weed, ii Explain why removing the weeds from her lawn would improve the quality of.
the grass plants, iii How could Frances reduce the number of weeds in her lawn. Total for Question 3 8 marks, P40124A0428, 4 Global warming may affect the number of insect pests by increasing their ability to. produce offspring An experiment was carried out to find out the effect of different. air temperatures on the ability of insects to produce offspring. Five tubes were set up at an air temperature of 16 C Each tube contained a male. and a female insect and some food This procedure was repeated at air temperatures. of 25 C 30 C 35 C and 45 C, The insects were allowed to mate and the number of offspring they produced after. two weeks was counted, The table shows the results. Temperature Number of offspring in each tube Total number of. in C Tube 1 Tube 2 Tube 3 Tube 4 Tube 5 offspring, 16 14 17 14 15 12 72.
25 88 92 95 100 87 462, 30 39 36 90 40 36 241, 35 19 17 15 22 16 89. 45 0 0 0 0 0 0, a Identify the anomalous result in the table and suggest a reason for the anomaly. P40124A0528 Turn over, b The diagram shows the insect offspring collected from one of the tubes in the experiment. male female, i Use the key to count the number of male and female offspring in this tube. number of males, number of females, ii Which tube did these insect offspring come from.
P40124A0628, c Explain why the results in the table are reliable. d Describe the results in the table and write a conclusion for this experiment. Total for Question 4 9 marks, P40124A0728 Turn over. 5 Emperor penguins live in the southern Polar Regions The temperature here can be. as low as 30 C, They have a number of adaptations that enable them to survive in such a cold climate. a Fully grown penguins are large often weighing up to 30 kg Most other birds are. much smaller, Explain how being large helps the penguin to survive at very low temperatures. b Penguins also have soft downy feathers and a thick layer of fat just below the skin. Suggest how these features help penguins to survive. P40124A0828, c One part of the penguin that is especially exposed to the cold is their feet The.
muscles that operate the feet are located in the penguin s body rather than in the. feet themselves, i Suggest how this benefits the penguin. ii The penguin s feet move when the muscles pull on string like structures called tendons. Suggest a property that these tendons should have, d Penguins huddle together to maintain their body temperature. Explain how this behaviour is an advantage to penguins. Total for Question 5 10 marks, P40124A0928 Turn over. 6 The diagram shows one side of an organ donor card. I request that after my death, A any part of my body may be used for the treatment. of others or, B my kidneys corneas heart lungs, liver pancreas be used for transplantation.
Signature Date, BLOCK CAPITALS, In the event of my death if possible contact. Remember to tell someone close to you that you want to be an. organ donor We ll need their agreement if the time ever comes. a The table lists different human illnesses, Complete the table by giving the donated organ named on the card needed to. cure each illness The first one has been done for you. Illness Organ needed to cure illness, uremia kidney. coronary failure, poor vision, P40124A01028, b Describe the role of the liver in digestion. c There is a shortage of people willing to donate their organs Scientists hope to. create cloned organisms to solve this problem, i What is a cloned organism.
ii Suggest two advantages of using cloned organisms to provide organs rather. than relying on people to donate organs, Total for Question 6 11 marks. P40124A01128 Turn over, BLANK PAGE, P40124A01228, 7 John wanted to investigate the effect of the size of potato tissue on the rate of osmosis. He cut three different sized cubes of potato one 0 5 0 5 x 0 5 cm one 1 1 1 cm. and one 2 2 2 cm, He weighed the potato cubes and recorded their masses. He then placed each cube into a beaker of distilled water and left them for 1 hour. He weighed them again and recorded their new masses. In each case the mass of the potato cubes increased. The table shows his results, Potato cube size Original mass Final mass Percentage change. in cm in g in g in mass, 0 5 0 5 x 0 5 0 06 0 07 16 67.
1 1 1 0 51 0 56, 2 2 2 4 04 4 10 1 49, His teacher told him to calculate the percentage change in mass of each cube. a i Calculate the percentage change in mass for the 1 1 1 cm cube. Show your working, ii Explain why John converted change in mass to percentage change in mass. P40124A01328 Turn over, b Use your knowledge of osmosis to explain why the mass of each cube increased. c John s teacher suggested that the different sized cubes have a different surface area. and volume, Use the formulae below to calculate the surface area SA of each cube the volume Vol. of each cube and their SA Vol ratios, SA 6 cube side in cm 2.
Vol cube side in cm 3, Write your answers in the table below One cube has been done for you. Cube side Surface area Volume, SA Vol ratio, in cm in cm2 in cm3. 0 5 1 5 0 125 12, P40124A01428, d Explain the effect of the different SA Vol ratios on the rate of osmosis into the potato. e Potato tissue is made from plant cells, Draw and label a plant cell in the space below. Total for Question 7 14 marks, P40124A01528 Turn over.
To investigate this effect a student put four plants with a total of 10 leaves into a beaker containing 400 cm3 of mineral ion solution together with a copper coin She repeated this with 400 cm3 of the mineral ion solution without a copper coin She counted the number of living leaves each day for the next eight days The table shows her results

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