Midterm Review #1 PDF

Aim: How can we demonstrate our knowledge of Unit 1 & 2 ? Do Now: 1.​ Shivering is an example of A.​ negative feedback mechanism; shivering ensures the body stays cold when it drops below normal body temperature. B.​ positive feedback mechanism; shivering ensures t...

Aim: How can we demonstrate our knowledge of Unit 1 & 2 ? Do Now: 1.​ Shivering is an example of A.​ negative feedback mechanism; shivering ensures the body stays cold when it drops below normal body temperature. B.​ positive feedback mechanism; shivering ensures the body warms up when it drops below normal body temperature. C.​ a positive feedback mechanism; shivering ensures the body stays cold when it drops below normal body temperature. D.​ a negative feedback mechanism; shivering ensures the body warms up when it drops below normal body temperature. 2. Activity 1: The table below describes the change to blood glucose level and insulin level Time (minutes) Blood Glucose Level Insulin Level (µU/mL) (mg/dL) 0 86 10 30 110 5 60 92 15 90 90 20 120 84 25 1.​ Describe the effect of insulin on blood glucose level. When the insulin level rises the blood sugar level 2.​ Determine the type of feedback mechanism illustrated in the table above. Support your answer with evidence from the table. It is negative feedback becuase the insulin are trying to get the boop glucose levels to come down 3.​ Complete the model below by labelling the diagram with the terms below. a.​ Set point b.​ Pancreas response c.​ Eating breakfast P Pancreas Eating breakfast Set point 4.​ Describe how the line representing blood glucose would change if the body could not return this system to normal glucose/sugar levels after eating a cookie. The boood glucose level wouldn’t go down but wouldn’t stay in place or continue into the pancreas 5.​ Based on the data and information provided, state whether or not it would be valid to conclude that bananas supply more glucose than cookies. Support your answer. No ti wouldn’t because it is only talking about one food cookie 6.​ Explain why most human cells require a supply of glucose. To keep us they need it to glucose is the energy for human cells Activity 2: Structure and Function Scientists at the University of Alberta investigated stomatal size in poplar trees grown in varying levels of relative humidity. The images to the left were taken with a light microscope from the abaxial (lower) side of a poplar leaf. The average size of stomata collected from the leaves are organized in the table below. ​ Relative Average stomatal Average stomatal Average stomatal pore humidity width height width 75% 2.2 μm 3.2 μm.6 μm 90% 2.8 μm 4.4 μm.9 μm 1.​ Which sequence represents structures organized from most complex to least complex? a.​ chloroplast → guard cell → leaf → oak tree b.​ guard cell → chloroplast → leaf → oak tree c.​ oak tree → guard cell → leaf → chloroplast d.​ oak tree → leaf → guard cell → chloroplast 2.​ A stomate in the lower surface of the leaf has a function most similar to the function of which cell structure? A.​ cell membrane B.​ vacuole C.​ ribosome D.​ nucleus 3.​ Describe the relationship between relative humidity and stomata size. The ralatishio between relative humidity and stomata size is that the higher the humidity the larger the stomata size 4.​ Why would it be beneficial to keep stomata open? To let water go in and also gases in 5.​ a. Draw a picture of the stomata when closed. Be sure to label guard cells, cell wall, cell membrane, chloroplast, and nucleus. b. What is the function of the chloroplast in the plant cell? 6.​ How does the structure of the guard cells help a plant maintain homeostasis? Guard cells help tge stain open and close so it can have a optimal level of water and carbon dioxeid Activity 3: 1.​ Which statement correctly describes the role of one process involved in the cycling of carbon between two of Earth’s systems illustrated in the model? a.​ During combustion, trees burn, cycling carbon from the earth to the organisms as carbon dioxide is absorbed. b.​ During respiration, trees cycle carbon from the atmosphere to the organisms as carbon dioxide is absorbed. c.​ During decomposition, trees decay, cycling carbon from the organisms to the atmosphere as carbon dioxide is released. d.​ During photosynthesis, trees cycle carbon from the organisms to the lake as carbon dioxide is released. 2.​ Which evidence based claim supports the presence of an environmental condition during the early Devonian period (shaded area) that contributed to the rapid spread and increase of plants on land? a.​ High levels of CO2 provided the carbon necessary to support an increase in the number of plants. b.​ Low levels of O2 during the early Devonian promoted the growth of larger plants. c.​ High levels of O2 provided the energy needed to support an increase in the number of plants. d.​ Low levels of CO2 during the early Devonian promoted the increase in the number of plants. 3.​ Identify the source of energy for all ecosystems. Sunlkguht energy 4.​ Explain the importance of decomposers in an ecosystem. To break downnutitirente for plant to grow Recycle Mariela 5.​ Bacteria in the soil are important for trapping nitrogen from the atmosphere. Identify the building block and macromolecule that requires nitrogen. Amino acids and protein 6.​ Describe the effects on an organism if they are unable to consume nitrogen. They can’t make protein Can’t make enzymes and may cause pellegra Exit Ticket: Google Form on GC