Welcome to your Edexcel A2 Biology 3 Lack of rhodopsin could cause the following condition. Long sight Short sight Colour blindness Night blindnessWhat happens during the P wave of electrocardiogram? Systole of atria takes place. Diastole of atria takes place. Systole of ventricles takes place. Diastole of ventricles takes place.The process where dead plant and animal matter is being converted into fine brown particles by soil micro organisms. Carbon fixation Formation of humus Nitrogen fixation MineralizationWhat does the electrocardiogram (ECG) T wave indicate is happening in the heart? The heart is at rest Repolarization of atria Repolarization of ventricles Depolarization of ventriclesWhich of the following is incorrect regarding the role of synapses? Synapses allow the interconnection of nerve pathways. Synapses are involved in memory and learning. Synapses ensure two-way transmission. Synapses allow integration of impulses.A factor which does not affect the speed of conductance in neurones. Myelination Temperature Size of the nucleus Axon diameterWhich of the following is responsible for saltatory conduction in myelinated neurones? Nodes of Ranvier Axon membranes Voltage-gated channel proteins Schwann cellsSelect the correct statement regarding cones. Cones are important for daytime vision. They are cylindrical cells. They contain rhodopsin. They are sensitive to low light intensities.In which heart chamber's wall does the electrical initiation of a heartbeat begin? Right ventricle Right auricle Left auricle Left ventricleA factor which does not affect the possibility of contracting diabetes mellitus? Hereditary factors Diet Intelligence LifestyleWhich of the following is incorrect regarding the unequal distribution of ions inside and outside of a resting nerve fibre? Concentration of sodium ions is high outside. Phosphate and organic anions are found inside. Concentration of potassium ions is low inside. Chlorine ions are the main anions found outside.Which of the following is an incorrect statement about the homeostatic control of the concentration of glucose in the blood? The hypothalamus is the control centre for blood glucose. The concentration of glucose in the blood fluctuates within narrow limits. The liver is an effector organ in blood glucose homeostasis. Negative feedback is involved in the control of blood glucose.Select the incorrect statement from the following. The atmosphere contains 60% of Nitrogen. Soil receives Nitrogen compounds in different ways. Plants cannot obtain Nitrogen directly. All animals fulfill their Nitrogen requirements from other plants and animals.The motor neurone forms a ______ with each muscle fibre and the synapse is called a _______. Motor end plate, gap junction Motor end plate, neuromuscular junction Neuromuscular junction, motor end plate Motor end plate, adherens junctionWhich of the following foods can lead towards diabetes mellitus? Jelly Apples Salad ChickpeasChoose the correct statement regarding the mineralization process of decomposition. Nitrification process does not take place. Inorganic compounds are converted into organic compounds. Carbohydrates are converted into nitrates Saprophytic bacteria and fungi take part in the process.The main cardiac control region of the brain. Cerebrum Hypothalamus Medulla oblangata CerebellumThe part of a myofibril between two Z lines is called a _________. H band Sarcomere I bandWhich of the following is incorrect regarding the selective permeability of neurilemma on a resting nerve fibre? Activates sodium and potassium ion pump. Displays high permeability to sodium ions than potassium ions. Displays moderate permeability for chlorine ions. Displays very less permeability for organic anions.Select the incorrect statement regarding the Nitrogen cycle. Atmospheric nitrogen fixation takes place in 2 major ways. Biological fixation of atmospheric nitrogen is performed by 2 ways. Nitrogen gas reacts with water in the rain due to lightening. Soil receives nitric acid from biological fixation.Which of the following is not an example of a neurotransmitter? Adrenaline Thyroxin Acetylcholine NoadrenalineTime is Up!