Curriculum for Excellence S2 Biology- Homework

Transcription

1 Name: Class: Teacher: Curriculum for Excellence S2 Biology- Homework HW 1,2 & 3 - Micro-Biology and Biotechnology HW 4, 5 & 6 Environmental Biology Homework Mark Comment Parent signature 1. Growth of microorganisms 2. Micro-organisms and food 3. Biotechnology 4. Human impact on the environment 5. Feeding relationships & Adaptations 6. Sampling techniques and Keys

2 Homework 1 Growth of Micro-organisms Mark /15 Q 1. State the 3 main types of micro-organisms. (3) Q 2. Which type of micro-organism particularly likes to grow on bread? (1) Q 3. Circle the correct underlined word in the following sentence. Fungi divide by forming spores or budding/splitting. (1) Q 4. Bacteria can divide into two in 20 minutes! How long would it take for 128 bacteria to be formed? (1) Q4. Look at the following diseases. Match them up with the micro-organism which causes them. The first one has been done for you. Micro-organism Disease Virus Bacterium Fungus Flu Typhoid Cholera AIDS Athlete s foot Polio (5)

3 Q 5. Linda left some bread in a dish to observe the growth of mould on it. She measured the area of mould every two days. Her results are shown below. Days Area of mould (cm 3 ) Use her results to draw a line graph below. Days (3) Q6. Over which two days did the mould grow fastest? (1)

4 Homework 2 Micro-organisms and Food Mark /15 Q1. The grid below refers to micro-organisms and the production of food and drink. A- Bacteria B- Carbon Dioxide C- Alcohol D- Oxygen E- Sugar F- Fungus Use the letters from the boxes to answer the following questions. a) Which term is used to describe yeast? (1) b) Which two products are formed during the fermentation of glucose? and (2) c) Which substance, produced by yeast, is responsible for the raising of dough? (1) d) Which type of micro-organism is used in the production of yoghurt? (1) Q2. Identify the micro-organism used in the production of the following foods and drinks. Draw a line from each product to the correct micro-organism. Product Cheese Wine Beer Bread Micro-organism Bacteria Yeast (2) Q3. State 3 safety precautions you would take when preparing food. 1) 2) 3) (3)

5 Q4. In this experiment the volume of gas given off was measured by measuring the diameter of a balloon. The results are shown in the table below. Time (mins) Diameter (cm) Present these results as a line graph below. (3) Time (mins) Q5. Suggest a reason why the graph levels off towards the end. (1) Q6. Suggest a way to make the reaction go faster. (1)

6 Homework 3 Biotechnology Mark /15 Q1. A student carried out an investigation to compare biological and non-biological detergents. Four pieces of cloth were stained and then each washed using a different detergent. The time taken for each stain to disappear is shown in the table below. Detergent Type of detergent Time taken for stain to disappear (minutes) Sunshine Biological 100 Sud-tastic Non-Biological 140 Dazzle Biological 120 Daisy Non-Biological 160 a) What conclusion can be drawn from these results in the comparison of biological and nonbiological washing powders? (1) b) Which variable was altered during this investigation? (1) c) Which washing powder has shown the best results? (1) d) Biological detergents contain enzymes. Which type of living organism is used to produce these enzymes? (1) e) These enzymes are enclosed in a harmless coating. Suggest a reason for this. (1) f) State two advantages of using biological detergents. (2)

7 Q2. Re-arrange the following stages of DNA extraction into the correct order. The first has been done for you. Order number Stage Add extraction solution containing salt and detergent Gently add cold ethanol 1 Squash the fruit Filter the mixture (3) Q3. Answer TRUE or FALSE to the following questions about DNA. a) Chromosomes are found in the nucleus of living cells. b) DNA is the genetic information we receive from our brothers and sisters. c) Our DNA is unique to each person. (3) Q4. Describe how the police can use DNA samples to solve crimes. (2)

8 Homework 4 Human impact on the environment Mark /15 Q1. State the meaning of the term biodiversity. (1) Q2. Describe two effects global warming has on the environment. (2) Q3. The level of Nitrogen Dioxide (a pollutant produced by industry) in air samples in five Scottish towns was measured. The results are shown in the table below. Town Number Level of nitrogen dioxide (micrograms per m 2 ) Trail 1 Trail 2 Trail 3 Average a) Complete the table with the average level of nitrogen dioxide for each town. (5) b) State which town has the highest nitrogen dioxide pollution. (1) c) Suggest why this might be. (1) d) State which town has the lowest nitrogen dioxide pollution. (1)

9 Q4. Describe three ways in which we can attempt to reduce global warming. (3)

10 Homework 5 Feeding relationships & adaptations Mark /15 Q1. The diagram below shows a woodland food web. a) Name the producer in the food web. (1) b) What do the arrows in a food web represent? (1) c) State all of the Herbivores in this food web. (3) d) The blue tit gains 150Kj of energy from a meal of holly leaf minor. 10% of this is passed onto the greater spotted woodpecker. Calculate the amount of energy the greater spotted woodpecker gains from this meal. Space for calculation kj (1)

11 Q2a) Use the paragraph below to construct a food web. Barn owls eat weasels, voles and mice. The diet of a vole is composed of seeds and grasses. Mice often compete for the same food as voles. Weasels are the main predator of the voles. b) Complete the two food chains from the food web you have constructed. The chains must consist of three organisms. (2) (2) Q3. State the meaning of the words predator and prey and give an example of each. Predator example Predator definition Prey example Prey definition (2) Q4. Define the term habitat. (1) Q5. Give an example of a species which is adapted to suit its habitat and describe two adaptations. Name of species Adaptation 1 Adaptation 2 (2)

12 Homework 6 Sampling techniques and Keys Mark /15 Q1. Daisies were sampled in a field of 1000m² using a 1m² quadrat. The results are shown in the table below. a) What was the average number of daisies found in each quadrat? Space for calculation daisies (1) b) Calculate the average number of daisies found in the entire field. Space for calculation daisies (1) c) Suggest a reason for the findings in quadrat 5. (1) Q2. Give an example of an organism that could be sampled using a pitfall trap. (1)

13 Q3. Some features of five varieties of daffodils are shown in the table below. a) Use the information in the table to complete the key below by writing the correct feature on each dotted line and the correct name in the empty boxes. (2) b) Give three features of the American Dream daffodil. (3) c) Describe one difference between Ice Follies and Barrett Browning daffodils. (1)

14 Q4. The table below shows some of the characteristics of six ladybird species which live in this country. a) Use the information from the table to complete the key below. (3) b) Which species of ladybird can be less than 4mm in length? (1) c) What characteristic could be used to distinguish between a Cream streaked ladybird from a 7 spotted ladybird? (1)