Biology
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24 questions
| 🇬🇧 | 🇬🇧 |
| Why is a stomata flaccid and why ? | A stomata is closed when it is too windy or at night time to prevent water loss and because photsynthesis can not occur. |
| What controls a stomata ? | Guard cells that allow C02 and 02 to diffuse via osmois. |
| What is a stomata ? | Tiny pores on a surface |
| How does blood flow through a heart to be oxygenated ? | Vena cava brings deoxygenated blood to the pulmonary artery that takes it to the lungs to be oxygenated, the blood travels back by the pulmonary vein to the heart to be pumped by the Aorta. |
| High and low blood pressure is in what | Artery=high bp small lumen veins = low bp wide lumen |
| Valves do what ? and septum does what ? | Prevent back flow and septum stops mixing |
| Ficks law equation is | Rate of diffusion = surface area x conc difference /thickness of membrane |
| The top line of ficks law eq means what | Directly proportional |
| Bottom line of ficks law eq means what | Inversely proportional so thickness of m is times by1/x then rate of d is x |
| Deamination | Excess proteins to fats , which makes ammonia which is toxix, made to urea to be excreted |
| What hormone helps osmoregulation | ADH is released by the pituarity gland to control water content (negative feedback ) |
| Biomass is what and what is the eq | Biomass equals energy and the biomass gained/the total biomass |
| FOOD CHAIN = | Producer - primary consumer -secondary consumer - tertiary consumer |
| 2 examples of sampling and why you use them | Random sampling = no of organisms in more than one location Belt transect= no of organisms along a transect line ( how light intensity could affect the pop) |
| Equation for sampling | Total area/area sampled x no of organsisms |
| Water is transported in a plant by | Transpiration in the xylem tube, that goes in one direction |
| Translocation occurs where | Phloem tube that goes up and down transporting food |
| If the body is too hot what happens | Vasoconstriction where the cappilaries contract to be closer the the skin so heat can be lost by radiation , creating sweat |
| Body is too cold | Shiver and constriction of capillaries to not allow heat to be evaporated by radiation (Vasodilatation ) |
| Photosynthesis equation | Carbon + water ---> sunglight ----> glucose + oxygen |
| Limiting factors and what happens if a graph plateus | LF = light intensity and temperature and conc of co2 a graph platueus when something is no longer the limiting factor |
| How as aveoli adapted ? | One cell thick for faster diffusion |
| Resipiration eq | Glucose + OXYGEN = C02 + water |
| Anaerobic and aerobic | No oxygen to oxygen |