Welcome to your AQA A2 Biology 4 What happens if the water potential increases in an organism? Water may move out of cells by osmosis. Metabolic reactions in the cells increase. Denaturation of enzymes and proteins occur. Water may enter the cell causing it to swell and maybe burst.Which condition may occur if necessary amounts of ADH is not secreted? Diabetes mellitus Diabetes insipidus Hematuria CholeraWhich of the following is incorrect regarding thermoregulation? Sweat production is increased when the environmental temperature is high. Vasoconstriction occurs when the environment temperature is low. Secretion of adrenaline is increased when the environmental temperature is low. Body hairs raise when the environmental temperature is high.Select the incorrect statement regarding phosphorus cycle. Free phosphate in ecosystem is an unlimited factor. Phosphorus cycle completes only through soil and water. Phosphorus is naturally present as insoluble phosphates in rocks. Compared to nitrogen cycle, phosphorus cycle completes very slowly.A difference between nitrogen cycle and phosphorus cycle. Micro organisms in the soil play a role. Phosphorus cycle does not have a phase which completes within the atmosphere. Plants and animals are involved. Decomposition and absorption of substances take place.Select the incorrect statement regarding fertilizers. Potassium fertilizers have little or no effect on soil pH. Nitrate based products are the least acidifying of all the nitrogen fertilizers. Of all the major fertilizer nutrients, nitrogen is the main nutrient affecting soil pH. Ammonium based products do not affect soil acidity.A physiological response generated by hypothalamus for decreased temperature in the surroundings. Shivering Lowering body hairs Increasing sweat production VasodilationWhich is not a limiting factor of photosynthesis? Temperature Light intensity Carbon dioxide concentration Speed of windWhich part of the eye is responsible for the process of accomodation? Ciliary body Retina Aqueous humor Vitreous humorWhat is a kinase? An enzyme that adds a phosphate group. An enzyme that oxidizes the substrate by removing one or more hydrogen atoms. An enzyme that removes a water molecule. An enzyme that converts a molecule from one isomer to another.Why cannot phosphorus exist in the atmosphere? It does not combine well with other elements. The sun evaporates it. It is a heavy gas. Phosphorus is usually liquid at normal temperature and pressure.A similarity between rod and cone cells. Number in retina Distribution Visual acuity Presence of visual pigmentsWhich of the following is a possible pathway of nitrogen movement? Soil-plants-air-soil-animals-air Soil-animals-plants-air-soil-animals Air-animals-air-soil-plants-animals Air-soil-plants-animals-soil-airIndustrial melanism is an example of ___________. Disruptive selection Stabilising selection Directional selection Sexual selectionWhich hormone is responsible for the maintenance of sodium ions in blood? ADH Insulin Epinephrine AldesteroneWhat happens if the water potential decreases in an organism? Water may enter the cells and and cause swelling. Metabolic reactions in the cell may slow down or stop. It may affect the visual sense. It causes a disturbance in the muscular system.A control system in organisms to keep the internal conditions near constant. Venostasis Catastasis Hemostasis HomeostasisThe site of pacinian corpuscles. Joint capsules and brain Mesenteries surrounding the gut, liver and muscles Skin, liver, scalp Skin, joint capsules, mesenteries surrounding the gutWhich is not a result of eutrophication? Oxygen in the water will deplete. Dead plants do not get decomposed. Plants and other aquatic organisms die. Algae blooms and prevents the sunlight from reaching other plants.Which part of the eye supplies nutrients to the eyeball? Fovea Pupil Sclera Choroid layerTime is Up!