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Q1
Part I: Penis
Part II: Testes
Part V: Epididymis
Part VI: Vas Deferens
Part VII: Urethra
Part VIII: Prostate Gland
Function of Part III (Fallopian Tubes): The fallopian tubes are responsible for transporting the egg from the ovary to the uterus. Fertilization also takes place in the fallopian tubes.
Function of Part IV (Uterus): The uterus is the organ where a fertilized egg implants and develops into a fetus. It also provides nourishment and protection to the developing fetus.
Function of Part VII (Ovaries): The ovaries produce and release eggs during the process of ovulation. They also produce hormones such as estrogen and progesterone.
Location of Processes:
(a) Fertilization: Fertilization takes place in the fallopian tubes.
(b) Production of sperm: The production of sperm takes place in the testes.
(c) Ovulation: Ovulation happens in the ovaries.
Two common infectious diseases that affect both the male and female reproductive system are:
1. Chlamydia: It is a sexually transmitted infection that can cause issues with fertility if left untreated.
2. Gonorrhea: Another sexually transmitted infection that can lead to infertility if not treated promptly.
(1bi)
(i) Common Name for the devices illustrated: These devices are agricultural tools or farm equipment.
(1bii) Naming of devices:
- Device A: This device is a plough.
- Device B: This device is a harrow.
- Device C: This device is a seeder.
(1biii) Use of each device:
- Plough (Device A): The plough is used for turning over the soil, breaking up clumps, and preparing it for planting.
- Harrow (Device B): The harrow is used for smoothing the soil surface, breaking up large clods, and removing weeds.
- Seeder (Device C): The seeder is used for sowing seeds evenly and in precise rows.
(1biv) The impact of Device C (seeder) on the soil: The seeder helps in evenly distributing the seeds at the desired depth, reducing overcrowding and competition among plants. It promotes efficient germination and uniform growth.
(1bv) Ways to prolong the usefulness of Device A (plough):
- Proper maintenance: Regular cleaning, greasing, and storage in a dry place can prevent rust and damage.
- Avoiding overloading: Not using the plough for tasks beyond its capacity can prevent wear and tear.
(1ci) Symbols for electronic components:
(a) Resistor: 🚫
(b) (p-n junction) diode: →|
(c) Cell: ⚡
(d) Light Emitting Diode/LED: 💡
(1cii) Circuit diagram demonstrating forward biasing of a (p-n junction) diode and the light emitting diode:
→| ⚡
| |
—————— 💡
(1di) Observations for the laboratory activities:
- Activity I: The iodated salt will dissolve in the water, resulting in a clear or slightly cloudy solution.
- Activity II: The vegetable oil will form a separate layer on top of the water due to immiscibility.
- Activity III: The grinded charcoal will sink to the bottom of the water, creating a dark suspension.
(1diii) Difference between observations in activities I and II: In activity I, the salt dissolves in the water, forming a solution. In activity II, the vegetable oil does not mix with the water and forms a separate layer due to immiscibility.
(1div) Method of separation for activity II: The separation technique for activity II is decantation. By allowing the mixture to settle, the water can be poured or siphoned off, leaving the vegetable oil behind.
Question 2 continues c) Three precautions against hazards:
Wearing Protective Gear: Use appropriate safety gear like helmets, gloves, and goggles to minimize risks when working with potentially hazardous materials or equipment.
Proper Ventilation: Ensure good ventilation in enclosed spaces to prevent the buildup of toxic fumes or gases that could lead to respiratory issues or asphyxiation.
Regular Maintenance: Regularly inspect and maintain equipment, machinery, and structures to identify and address potential hazards before they become more significant issues.
D(I) Two practices that destroy water bodies:
Industrial Pollution: Discharging untreated industrial waste and chemicals into water bodies can contaminate the water, harming aquatic life and ecosystems.
Illegal Dumping: Improper disposal of waste, including plastics and hazardous materials, into water bodies can lead to pollution, disrupting the natural balance and causing harm to marine life.
iI ) Two methods of conserving water bodies:
Watershed Management: Protecting and managing the land around water bodies helps reduce soil erosion, sediment runoff, and pollution, which can negatively impact water quality.
Efficient Water Use: Implementing water-saving practices such as reducing water consumption, using efficient irrigation methods, and fixing leaks helps conserve water resources and maintain the health of water bodies.
4a.I . The importance of a fuse in an electrical appliance is to act as a safety device that helps protect the appliance and prevent electrical hazards. Fuses are designed to break or "blow" when there's an excessive amount of current flowing through a circuit, which could potentially cause overheating, fires, or damage to the appliance. By breaking the circuit, the fuse helps prevent these risks.
ii. Two household appliances that have fuses are:
1. Microwave ovens
2. Toaster ovens
b. Teenage pregnancy refers to the condition in which a female teenager becomes pregnant, typically between the ages of 13 and 19. It carries significant social, emotional, and health implications for both the pregnant teenager and the baby.
Two causes of teenage pregnancy are:
1. Lack of comprehensive sex education: Limited knowledge about contraception and reproductive health can contribute to unintended pregnancies among teenagers.
2. Socioeconomic factors: Teens from disadvantaged backgrounds may face challenges such as lack of access to healthcare, limited educational opportunities, and poor family support, which can increase the likelihood of teenage pregnancy.
5.d)1)a galaxy is a large system of stars, gas, and dust held together by gravity. In technology,
d).11) Stars are a component of galaxies. Galaxies are large systems of stars, gas, and dust held together by gravity. Stars are born within galaxies and are integral to their structure and evolution.
d.111. The Milky Way is the galaxy in which our solar system is located. It is a barred spiral galaxy with a central bar-shaped structure surrounded by spiral arms of stars, gas, and dust. The Milky Way is estimated to contain between 100 and 400 billion stars, including our own Sun. It is also home to various types of celestial objects such as nebulae, star clusters, and black holes.
