1) Step 1: Identify the parts of the animal cell shown in the diagram. The diagram shows a typical animal cell. 'i' points to the cell membrane, 'j' points to the cytoplasm, and 'k' points to the nucleus. Step 2: Determine which part contains genetic material. In an animal cell, the genetic material (DNA) is primarily located in the nucleus. Step 3: Match the part with the label. Label 'k' represents the nucleus. The correct option is C. $$\boxed{\text{C. k}}$$ 2) Step 1: Understand the effect of touching a Van de Graaf generator. A Van de Graaf generator builds up a large static electric charge. When a person touches it, this charge is transferred to them, causing their hair to stand on end and often producing a tingling sensation due to the flow of electrons or discharge. Step 2: Identify the form of energy associated with this sensation. The sensation is caused by the transfer and discharge of electrical energy. The correct option is C. $$\boxed{\text{C. Electrical energy}}$$ 3) Step 1: Analyze the process described. A learner heated a mixture of iron filings and sulfur, and a new black solid was formed. This indicates that the original substances (iron and sulfur) reacted to form a new substance (iron sulfide). Step 2: Classify the type of change. When new substances are formed, it is a chemical change. The correct option is B. $$\boxed{\text{B. chemical change}}$$ 4) Step 1: Understand the function of a bicycle dynamo. A bicycle dynamo is a device that generates electricity when the bicycle wheel rotates. It converts the mechanical energy of the rotating wheel into electrical energy. Step 2: Identify the energy transformation for the bulb to light. The electrical energy produced by the dynamo is then supplied to the bulb, which converts it into light and heat energy. The primary transformation by the dynamo to enable the bulb to light is mechanical energy to electrical energy. The correct option is C. $$\boxed{\text{C. Mechanical to electrical}}$$ 5) Step 1: Review the symptoms provided. The patient exhibits swollen lymph nodes, fatigue, discomfort, sore throat, loss of patches of hair, weight loss, and fever. Step 2: Identify the infection commonly associated with these symptoms, particularly "loss of patches of hair." While many infections can cause general symptoms like fever and fatigue, the symptom of "loss of patches of hair" (alopecia) is a characteristic sign of secondary Syphilis. The correct option is C. $$\boxed{\text{C. Syphilis}}$$ 6) Step 1: Recall the phases of the menstrual cycle. The menstrual cycle typically lasts about 28 days. It includes the follicular phase, ovulation, and the luteal phase. Step 2: Determine when ovulation usually occurs. Ovulation, the release of an egg from the ovary, generally occurs around the middle of the cycle. In a 28-day cycle, this is typically around Day 14. The correct option is C. $$\boxed{\text{C. Day 14}}$$ 7) Step 1: Observe the experimental setup in the picture. The picture shows a solution (Copper(II) Sulphate solution) being heated, and solid particles (crystals) are forming. This process involves the formation of solid crystals from a solution. Step 2: Identify the separation method. The method of obtaining pure solid crystals from a solution by allowing the solvent to evaporate and the solute to solidify is called crystallization. The correct option is B. $$\boxed{\text{B. Crystallization}}$$ 8) Step 1: Examine the labels 'h' and 'i' in the diagram from Question 7. Label 'h' points to the container holding the copper(II) sulfate solution, which is an evaporating dish. Label 'i' points to the stand supporting the evaporating dish, which is a tripod stand. Step 2: Match the labels to the correct apparatus. 'h' is an evaporating dish, and 'i' is a tripod stand. The correct option is A. $$\boxed{\text{A. evaporating dish and tripod stand}}$$ 9) Step 1: Consider the nature of perfumes and their production. Perfumes are complex mixtures of fragrant compounds, often derived from natural sources (flowers, plants, etc.). These fragrant compounds are typically organic molecules that are soluble in organic solvents. Step 2: Evaluate the given separation methods for perfume production. • Paper chromatography is an analytical technique, not a large-scale production method. • Evaporation is used to separate a soluble solid from a liquid, but perfumes involve extracting complex organic compounds. • Crystallization is for obtaining pure solids from solutions. • Solvent extraction is a common industrial method used to separate components from a mixture by using a solvent that selectively dissolves one or more components. This is widely used to extract essential oils and fragrant compounds from plant materials for perfume production. The correct option is D. $$\boxed{\text{D. Solvent extraction}}$$