Basic Science Js 3

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Basic Science Js 3 - Quiz

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Questions and Answers
  • 1. 

    1. The washing away of nutrients down the soil by water is called………..

    • A.

      {a} Erosion

    • B.

      {b} Pollution

    • C.

      {c } Eruption

    • D.

      {d}weathering

    • E.

      Option 5

    Correct Answer
    A. {a} Erosion
    Explanation
    Erosion is the process by which water or wind removes soil, rock, or dissolved material from one location and transports it to another. In the context of the question, the washing away of nutrients down the soil by water is a clear example of erosion.

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  • 2. 

    2. The heat from the sun reaches the earth mainly by………..

    • A.

      {a}reflection

    • B.

      {b}radiation

    • C.

      {c}convection

    • D.

      {d}conduction

    Correct Answer
    B. {b}radiation
    Explanation
    The heat from the sun reaches the earth mainly by radiation. Radiation is the transfer of heat through electromagnetic waves, such as light and infrared waves. In the case of the sun, it emits a vast amount of energy in the form of radiation, which travels through space and reaches the earth. This radiation is then absorbed by the earth's atmosphere and surface, warming up the planet.

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  • 3. 

    3. Alpha particle is

    • A.

      {a} negatively charged

    • B.

      {b}neutral

    • C.

      {c} positively charged

    • D.

      {d} an electron

    Correct Answer
    A. {a} negatively charged
    Explanation
    An alpha particle is not negatively charged. It is actually positively charged. Alpha particles are made up of two protons and two neutrons, giving them a charge of +2. Therefore, option {c} "positively charged" is the correct answer.

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  • 4. 

    4. Environmental hazard involves the following EXCEPT

    • A.

      {a}bush burning

    • B.

      {b}flooding

    • C.

      {c} deforestation

    • D.

      {d} depletion of ozone layer

    Correct Answer
    C. {c} deforestation
    Explanation
    Deforestation is the process of clearing or removing trees from a forested area. It is not considered an environmental hazard in itself, but rather a human activity that can lead to environmental hazards such as soil erosion, loss of biodiversity, and climate change. Therefore, deforestation is the exception in this list of environmental hazards.

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  • 5. 

    5. The consequences of unsafe abortion include all EXCEPT

    • A.

      {a}   infection

    • B.

       {b} perforation of the uterus

    • C.

      {c} death 

    • D.

      {d}increased fertility

    Correct Answer
    D. {d}increased fertility
    Explanation
    Unsafe abortion can lead to various consequences, including infection, perforation of the uterus, and even death. However, it does not result in increased fertility. In fact, unsafe abortion can cause damage to the reproductive organs, leading to complications that may reduce fertility or make it difficult for a person to conceive in the future. Therefore, the correct answer is (d) increased fertility.

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  • 6. 

    6. When you intentionally abort a pregnancy it is called ---------------- abortion.

    • A.

      {a} removed

    • B.

      {b}  spontaneous

    • C.

      {c}miscarriage  

    • D.

      {d}induced

    Correct Answer
    D. {d}induced
    Explanation
    When a pregnancy is intentionally terminated or ended by medical or surgical means, it is referred to as induced abortion. This is different from a spontaneous abortion (miscarriage), which occurs naturally without any intentional intervention. The term "removed" does not accurately describe the intentional termination of a pregnancy, and "spontaneous" and "miscarriage" refer to natural, involuntary pregnancy loss. Therefore, the correct answer is "induced."

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  • 7. 

    7. Which of these radiations is used to kill germs?

    • A.

      {a}Alpha

    • B.

      {b} Beta

    • C.

      {c} Gamma

    • D.

      {d}Yamma

    Correct Answer
    C. {c} Gamma
    Explanation
    Gamma radiation is used to kill germs. Gamma radiation consists of high-energy photons that can penetrate through materials and damage the DNA of microorganisms, including bacteria and viruses. This damage disrupts their cellular function and ultimately kills them. Gamma radiation is commonly used in sterilization processes for medical equipment, food, and water, as well as in the treatment of cancer.

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  • 8. 

    8. The first Scientist that discovered radio activity was

    • A.

      {a}Becquerel

    • B.

      {b} Marie curie

    • C.

      {c} Pierre curie

    • D.

      {d} Dalton

    Correct Answer
    A. {a}Becquerel
    Explanation
    The correct answer is Becquerel. Becquerel was the first scientist to discover radioactivity. He made this discovery in 1896 while working with uranium salts. He found that these salts emitted rays that could pass through opaque materials and expose photographic plates. This discovery laid the foundation for further research on radioactivity and its applications in various fields.

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  • 9. 

    9. An inclined plane wrapped round a metal rod is a

    • A.

      {a} Screw

    • B.

      {b} lever

    • C.

      {c} pulley

    • D.

      {d} gear

    Correct Answer
    A. {a} Screw
    Explanation
    An inclined plane wrapped around a metal rod forms a screw. A screw is a simple machine that consists of an inclined plane wrapped around a cylindrical post or rod. It is used to convert rotational motion into linear motion or vice versa. The inclined plane on the screw allows it to exert a large amount of force over a small distance, making it useful for tasks such as lifting heavy objects or holding things together.

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  • 10. 

    10. Which of the following Simple Machines is an example of Wheel and Axle

    • A.

      {a} bottle opener

    • B.

      {b} pair of scissors

    • C.

      {c} Spoon

    • D.

      {d} razor blade

    Correct Answer
    D. {d} razor blade
    Explanation
    A razor blade is an example of a wheel and axle because it consists of a small wheel (the blade) that rotates around a central axis (the axle) when it is used for cutting.

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  • 11. 

    11. One of these cannot reduce friction in machines.

    • A.

      {a}oil

    • B.

      {b}fuel

    • C.

      {c} grease

    • D.

      {d} gears

    Correct Answer
    A. {a}oil
    Explanation
    Oil cannot reduce friction in machines. While oil can be used as a lubricant to reduce friction, it does not directly reduce friction itself. Instead, oil forms a thin layer between moving parts, which helps to minimize direct contact and friction between them. Fuel, grease, and gears can all contribute to reducing friction in machines. Fuel can provide energy for the machine to operate smoothly, grease can be used as a lubricant similar to oil, and gears can help distribute the force and reduce friction in the machine's moving parts.

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  • 12. 

    12.One disadvantage of not abstaining from premarital sexual intercourse is

    • A.

      {a] teenage pregnancy

    • B.

      {b}academic excellence

    • C.

      {c} good body posture

    • D.

      {d}high self esteem

    Correct Answer
    D. {d}high self esteem
    Explanation
    Engaging in premarital sexual intercourse can lead to a decrease in self-esteem. This is because individuals may feel guilty or regretful about their actions, especially if they have been taught that premarital sex is morally wrong or against their personal values. Additionally, there may be societal stigma or judgment associated with engaging in sexual activity before marriage, which can also negatively impact self-esteem.

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  • 13. 

    13. The following are the consequences of teenage pregnancy EXCEPT

    • A.

      {a}termination of education

    • B.

      {b}stigmatization

    • C.

      {c}unsafe abortion

    • D.

      {d} high self esteem

    Correct Answer
    D. {d} high self esteem
    Explanation
    The correct answer is {d} high self-esteem. Teenage pregnancy often leads to negative consequences such as termination of education, stigmatization, and unsafe abortion. However, it is unlikely to result in high self-esteem as it can bring about feelings of shame, guilt, and low self-worth due to societal judgment and challenges faced by young parents.

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  • 14. 

    14. Limestone is a mineral that can be found in…………..

    • A.

      {a} Okitipupa

    • B.

      {b}Ewekoro

    • C.

      {c}Umuahia

    • D.

      {d}Jos

    Correct Answer
    B. {b}Ewekoro
    Explanation
    Limestone is a mineral that can be found in Ewekoro.

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  • 15. 

    15. Which of the following minerals can be used to make Jewellery

    • A.

      {a}lead

    • B.

      {b}limestone

    • C.

      {c}gold

    • D.

      {d} kaolin

    Correct Answer
    C. {c}gold
    Explanation
    Gold is the correct answer because it is a mineral that is commonly used to make jewelry. Gold is known for its beauty, durability, and rarity, making it a popular choice for crafting jewelry pieces. It can be easily shaped into various forms and can be combined with other metals to create different colors and designs. Additionally, gold is highly valued and has been used in jewelry making for centuries due to its cultural and historical significance.

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  • 16. 

    16. One of the following is NOT a resource from plants

    • A.

      {a} sponge

    • B.

      {b}potato

    • C.

      [c]cheese

    • D.

      {d]palm wine

    Correct Answer
    C. [c]cheese
    Explanation
    Cheese is not a resource from plants. It is a dairy product made from milk, which is obtained from animals such as cows, goats, or sheep. Sponge, potato, and palm wine, on the other hand, are all resources that can be derived from plants.

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  • 17. 

    17. A magnet can attract …………..

    • A.

      {a} lead

    • B.

      {b} glass

    • C.

      {c}copper

    • D.

      {d}Iron

    Correct Answer
    D. {d}Iron
    Explanation
    A magnet can attract iron because iron is a ferromagnetic material. When a magnet is brought close to iron, the magnetic field of the magnet aligns the magnetic domains in the iron, causing it to be attracted to the magnet. This attraction is the result of the electromagnetic force between the magnet and the iron.

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  • 18. 

    18. ……….. is used as a safety measure or device to prevent overloading of electric circuit.

    • A.

      {a}Fuse

    • B.

      {b}Battery

    • C.

      {c}Ammeter

    • D.

      {d}Rheostat

    Correct Answer
    A. {a}Fuse
    Explanation
    A fuse is used as a safety measure or device to prevent overloading of an electric circuit. When the current flowing through the circuit exceeds a safe limit, the fuse melts and breaks the circuit, preventing damage to the circuit and potential hazards such as fire or electrical shock. Fuses are designed to be easily replaceable, providing a cost-effective and efficient solution to protect electrical systems from overload.

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  • 19. 

    19. When light passes from air to glass ………..takes place

    • A.

      {a} reflection

    • B.

      {b}refraction

    • C.

      {c}absorption

    • D.

      {d}diffraction

    Correct Answer
    B. {b}refraction
    Explanation
    When light passes from air to glass, refraction takes place. Refraction is the bending of light as it passes from one medium to another with a different refractive index, such as from air to glass. This bending occurs because the speed of light changes when it enters a different medium, causing the light rays to change direction.

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  • 20. 

    20.Sound travels fastest in …………

    • A.

      {a}air

    • B.

      {b} water

    • C.

      {c} kerosene

    • D.

      {d}petrol.

    Correct Answer
    A. {a}air
    Explanation
    Sound travels fastest in air because air is less dense compared to other mediums like water, kerosene, and petrol. Sound waves travel through the vibration of particles in a medium, and the speed of sound depends on the density and elasticity of the medium. Since air has lower density and higher elasticity compared to water, kerosene, and petrol, sound waves can travel faster in air.

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  • 21. 

    21. The three types of radiations emitted by radioactive elements are

    • A.

      {a} alpha, beta and gamma rays

    • B.

      {b} alpha, beta and X-rays

    • C.

      {c} beta, gamma and K-rays

    • D.

      {d} alpha, gamma and S-rays

    Correct Answer
    A. {a} alpha, beta and gamma rays
    Explanation
    Radioactive elements emit three types of radiation: alpha, beta, and gamma rays. Alpha particles are made up of two protons and two neutrons and have a positive charge. Beta particles are high-energy electrons or positrons that are emitted during radioactive decay. Gamma rays are electromagnetic radiation with high energy and no charge. These three types of radiation have different properties and can be used for various applications in medicine, industry, and research.

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  • 22. 

    22. which of the three rays of radioactive elements can be stopped by paper?

    • A.

      {a} Beta

    • B.

      {b}Alpha

    • C.

      {c} Gamma

    • D.

      {d} None of the above

    Correct Answer
    B. {b}Alpha
    Explanation
    Alpha rays can be stopped by paper because they consist of large, heavy particles (helium nuclei) that have a positive charge. When these particles collide with the atoms in a piece of paper, they lose energy and are easily absorbed, preventing them from penetrating further. Beta rays, on the other hand, consist of fast-moving electrons or positrons and can penetrate paper. Gamma rays are high-energy electromagnetic waves that can also penetrate paper. Therefore, the correct answer is Alpha.

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  • 23. 

    23. Which of the following is used to take photographs of the human body?

    • A.

      {a}Beta particles

    • B.

      {b}Alpha particles

    • C.

      {c} X ray

    • D.

      {d} Gamma ray

    Correct Answer
    C. {c} X ray
    Explanation
    X-rays are used to take photographs of the human body. X-ray imaging is a common diagnostic tool in medicine, allowing doctors to see the internal structures of the body. X-rays are a form of electromagnetic radiation that can penetrate the body and create images of bones, organs, and other tissues. They are commonly used to diagnose fractures, infections, tumors, and other medical conditions. X-ray machines emit a controlled amount of radiation, which is absorbed differently by different tissues in the body, creating contrast in the resulting image.

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  • 24. 

    24. Radioactivity is the spontaneous -----------------of rays from the nuclei of radioactive elements

    • A.

      {a}formation

    • B.

      {b} decay

    • C.

      {c}integration

    • D.

      {d}emission

    Correct Answer
    B. {b} decay
    Explanation
    Radioactivity refers to the spontaneous emission of rays from the nuclei of radioactive elements. This process is known as decay, where the unstable nucleus of an atom releases energy in the form of radiation. The decay occurs due to the instability caused by an excess of protons or neutrons in the nucleus. Therefore, option {b} "decay" is the correct answer as it accurately describes the process of radioactivity.

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  • 25. 

    25.The first Scientist that discovered radio activity was

    • A.

      {a}Becquerel

    • B.

      {b}Marie curie

    • C.

      {c} Pierre curie

    • D.

      {d}Dalton

    Correct Answer
    A. {a}Becquerel
    Explanation
    Becquerel was the first scientist to discover radioactivity. He made this discovery accidentally while experimenting with phosphorescent materials. He found that uranium salts emitted rays that could penetrate opaque materials and expose photographic plates. This led to the understanding of a new phenomenon called radioactivity, which revolutionized the field of physics and eventually earned Becquerel the Nobel Prize in Physics in 1903. Marie Curie, Pierre Curie, and Dalton are not associated with the discovery of radioactivity.

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  • 26. 

    26. A tool that allows a force at one point to overcome a resisting force at another point is called a/an

    • A.

      {a} carrier

    • B.

      {b} machine

    • C.

      {c} organ

    • D.

      {d} gadget

    Correct Answer
    B. {b} machine
    Explanation
    A machine is a tool that allows a force at one point to overcome a resisting force at another point. Machines are designed to make work easier by multiplying or changing the direction of the applied force. They can be used to lift heavy objects, move loads, or perform various tasks that would be difficult or impossible to do with human strength alone.

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  • 27. 

    27. Which of the following Simple Machines is an example of Wheel and Axle?

    • A.

      {a} bottle opener

    • B.

      {b} pair of scissors

    • C.

      {c} Spoon

    • D.

      {d} razor blade

    Correct Answer
    D. {d} razor blade
    Explanation
    A razor blade is an example of a wheel and axle because it consists of a small wheel (the razor blade itself) attached to a larger axle (the handle). When the wheel (blade) is rotated around the axle (handle), it allows for easy cutting and shaving.

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  • 28. 

    28. The following are useful application of friction EXCEPT

    • A.

      {a}brakes

    • B.

      {b}clutches

    • C.

      {c} pulleys

    • D.

      {d} slides

    Correct Answer
    D. {d} slides
    Explanation
    Friction is a force that opposes motion and it is useful in various applications. Brakes utilize friction to slow down or stop the motion of vehicles or machines. Clutches use friction to engage or disengage the transmission of power between two rotating shafts. Pulleys rely on friction to transmit force and change the direction of motion. However, slides do not require friction as they are designed to allow smooth and easy movement without any resistance. Therefore, slides are not considered a useful application of friction.

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  • 29. 

    29. The care given to a woman during pregnancy is called

    • A.

      {a} ante-natal

    • B.

      {b}post-natal

    • C.

      {c}contraception

    • D.

      {d}intra natal

    Correct Answer
    A. {a} ante-natal
    Explanation
    The care given to a woman during pregnancy is called "ante-natal" care. This type of care includes regular check-ups, screenings, and medical advice to ensure the health and well-being of both the mother and the developing baby. It focuses on monitoring the progress of the pregnancy, identifying any potential complications or risks, and providing necessary support and guidance to the pregnant woman.

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  • 30. 

    30. The removal, by mechanical or Chemical means of a fertilized egg from the uterus, for the purpose of terminating the pregnancy before the 28th week is called ----------------

    • A.

      {a}contraception

    • B.

      {b}conception

    • C.

      {c}abortion

    • D.

      {d} sterility

    Correct Answer
    C. {c}abortion
    Explanation
    Abortion is the correct answer because it refers to the intentional termination of a pregnancy before the 28th week by removing the fertilized egg from the uterus. It can be done through mechanical or chemical means. Contraception refers to methods used to prevent pregnancy, conception refers to the fertilization of an egg by sperm, and sterility refers to the inability to conceive or produce offspring.

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  • 31. 

    31. HIV/AIDS can be contracted through

    • A.

      {a} unprotected sexual intercourse

    • B.

      {b}hand shake

    • C.

      [c]smoking

    • D.

      {d]sharing utensils

    Correct Answer
    A. {a} unprotected sexual intercourse
    Explanation
    HIV/AIDS can be contracted through unprotected sexual intercourse because the virus is present in the bodily fluids of an infected person, including blood, semen, vaginal fluids, and breast milk. During sexual intercourse, these fluids can be exchanged between partners, allowing the virus to enter the body of an uninfected individual. Other modes of transmission, such as handshakes, smoking, or sharing utensils, do not involve direct contact with infected bodily fluids and therefore do not pose a risk of contracting HIV/AIDS.

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  • 32. 

    32. Which of the following is NOT a lever?

    • A.

      {a} screw

    • B.

      {b} hammer

    • C.

      {c}Plier

    • D.

      {d}pulley

    Correct Answer
    D. {d}pulley
    Explanation
    A pulley is not a lever because it does not have a rigid bar or beam that pivots on a fulcrum. A lever is a simple machine that consists of a rigid object, such as a beam or a bar, that is free to rotate around a fixed point called a fulcrum. In contrast, a pulley is a wheel with a groove that a rope or belt can run along, and it is used to change the direction or magnitude of a force. Therefore, a pulley does not fit the definition of a lever.

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  • 33. 

    33. A tool used by carpenter to tighten a joint is

    • A.

      {a} screw

    • B.

      {b}plane

    • C.

      {c}gear

    • D.

      {d}hammer

    Correct Answer
    D. {d}hammer
    Explanation
    A carpenter typically uses a hammer to tighten a joint. A hammer is a tool with a heavy metal head that is used to strike or pound objects, such as nails or wooden joints, to secure them in place. It is commonly used in carpentry to drive nails into wood or to tap and tighten joints for a secure fit.

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  • 34. 

    34. Radioactivity is used for the following EXCEPT

    • A.

      {a} carbon dating

    • B.

      {b}kill germs

    • C.

      {c}treat cancer

    • D.

      {d}surgery

    Correct Answer
    D. {d}surgery
    Explanation
    Radioactivity is used in various fields for different purposes. Carbon dating is a method that uses radioactivity to determine the age of archaeological artifacts. Radiotherapy, which involves the use of radiation to kill cancer cells, is a common treatment for cancer. Additionally, radioisotopes are used to sterilize medical equipment and kill germs. However, radioactivity is not directly used in surgery. Therefore, the correct answer is (d) surgery.

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  • 35. 

    35.The tear between the vagina and the urinary tract as a consequence of teenage pregnancy is called

    • A.

      {a} Vesico Vaginal Vistula-VVF

    • B.

      {b} Recto Vaginal Fistula RVF

    • C.

       {c} Caesarian Section

    • D.

      {d} wear and tear

    Correct Answer
    A. {a} Vesico Vaginal Vistula-VVF
    Explanation
    The tear between the vagina and the urinary tract that occurs as a result of teenage pregnancy is called Vesico Vaginal Fistula (VVF). This condition can cause urine to leak from the vagina, leading to discomfort and embarrassment for the affected individual. It is important to diagnose and treat VVF promptly to prevent complications and improve the quality of life for the patient.

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  • 36. 

    36. One of the following particles is not emitted during radioactive decay?

    • A.

      {a} Alpha Particles

    • B.

      {b} Beta particles

    • C.

      {c } Gamma ray

    • D.

      {d}Neutron

    Correct Answer
    D. {d}Neutron
    Explanation
    During radioactive decay, alpha particles, beta particles, and gamma rays are commonly emitted. Alpha particles consist of two protons and two neutrons, beta particles are either electrons or positrons, and gamma rays are high-energy photons. Neutrons, on the other hand, are not typically emitted during radioactive decay. They are usually found within the nucleus of an atom and are involved in nuclear reactions, but they are not considered a product of radioactive decay.

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  • 37. 

    37. Hides and Skin are used in leather industry for the production of ……,………….. and ……………

    • A.

      (a) belt, bags and shoes

    • B.

      (b) bags, shoes and spoon

    • C.

      (c) hoes, belt and table

    • D.

      (d) table, chair and purse.

    Correct Answer
    A. (a) belt, bags and shoes
    Explanation
    Hides and skin are used in the leather industry for the production of various products such as belts, bags, and shoes. These materials are durable and can be shaped and crafted into different designs, making them ideal for creating accessories and footwear.

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  • 38. 

    38.Animal dung and poultry droppings are used in making…………

    • A.

      (a)wood

    • B.

      (b)paper

    • C.

      (c)fertilizer to improve soil fertility

    • D.

      (d) ropes.

    Correct Answer
    C. (c)fertilizer to improve soil fertility
    Explanation
    Animal dung and poultry droppings are commonly used as organic fertilizers in agriculture. They are rich in nutrients such as nitrogen, phosphorus, and potassium, which are essential for plant growth. When these organic materials are added to the soil, they break down and release these nutrients gradually, providing a steady supply of nourishment to plants. This helps to improve soil fertility, enhance crop yield, and promote healthy plant growth. Therefore, animal dung and poultry droppings are commonly used in making fertilizer to improve soil fertility.

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  • 39. 

    39.Beasts of burden are animals that are…….

    • A.

      (a)raised for making money

    • B.

      (b)raised for grazing only

    • C.

      (c)raised for their meat

    • D.

      (d) used for means of transportation and working on  the farm.

    Correct Answer
    D. (d) used for means of transportation and working on  the farm.
    Explanation
    Beasts of burden are animals that are used for means of transportation and working on the farm. This means that they are utilized to carry heavy loads, pull carts or plows, and perform various tasks on the farm. These animals, such as horses, donkeys, and oxen, are trained and domesticated specifically for their strength and ability to assist with agricultural work.

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  • 40. 

    40. Resources are …………………………..

    • A.

      (a) Valuables we get from living and non-living things

    • B.

      (b) properties we no longer use

    • C.

      (c) items we buy and sell

    • D.

      (d) crops we harvest and eat.

    Correct Answer
    A. (a) Valuables we get from living and non-living things
    Explanation
    Resources are valuables that we obtain from both living and non-living things. These can include natural resources such as minerals, water, and air, as well as resources obtained from living organisms such as food, wood, and medicinal plants. These resources are essential for human survival and are used for various purposes, including consumption, production, and trade.

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  • 41. 

    41. Four examples of plant resources are………… 

    • A.

      (a)cash crops, food crops, dyes and drugs

    • B.

      (b)food crops,milk,cheese and drug

    • C.

      (c)cash crops, dyes, drugs, hides and skin

    • D.

      (d)drugs, iroko tree, meat and butter.

    Correct Answer
    A. (a)cash crops, food crops, dyes and drugs
  • 42. 

    42………………is not an animal product.

    • A.

      (a)horn

    • B.

      (b)manure

    • C.

      (c)milk

    • D.

      (d) fibre

    Correct Answer
    D. (d) fibre
    Explanation
    The given question is asking for an animal product, and the only option that is not an animal product is (d) fibre. Horn, manure, and milk are all derived from animals, while fibre can be obtained from plants. Therefore, the correct answer is (d) fibre.

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  • 43. 

    43.The characters that are transferred from parents to offspring are referred to as …….

    • A.

      (a)traits

    • B.

      (b)progeny

    • C.

      (c)phenotype

    • D.

      (d)progeny

    Correct Answer
    A. (a)traits
    Explanation
    Traits are the characteristics or attributes that are passed down from parents to their offspring. These traits can include physical characteristics, such as eye color or height, as well as behavioral or genetic traits. The passing on of traits from one generation to the next is a fundamental concept in genetics and is a result of the inheritance of genes from parents to their offspring.

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  • 44. 

    44. Which of these can be transferred genetically from parents to offspring?

    • A.

      (a)dressing code

    • B.

      (b)smoking

    • C.

      (c)developed muscles

    • D.

      (d)skin colour

    Correct Answer
    D. (d)skin colour
    Explanation
    Skin color can be transferred genetically from parents to offspring. This is because skin color is determined by the presence of certain genes that are inherited from parents. These genes control the production of melanin, the pigment responsible for skin color. Different combinations of these genes result in different skin colors, and these combinations can be passed down from parents to their children. Therefore, offspring can inherit their skin color from their parents.

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  • 45. 

    45.Blockage of drainage gutters can cause

    • A.

      (a)flooding

    • B.

      (b)erosion

    • C.

      (c)sedimentation

    • D.

      (d)soil movement

    Correct Answer
    A. (a)flooding
    Explanation
    Blockage of drainage gutters can cause flooding because when the gutters are blocked, water cannot flow freely and gets accumulated. This accumulation of water can lead to overflow and flooding in the surrounding areas.

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  • 46. 

    46. Dumping of refuse can cause

    • A.

      (a)flooding

    • B.

      (b)erosion

    • C.

      (c)soil fertility

    • D.

      (d)decomposition

    Correct Answer
    A. (a)flooding
    Explanation
    Dumping of refuse can cause flooding because when refuse is dumped in rivers, canals, or other water bodies, it can block the natural flow of water. This obstruction can lead to the accumulation of water, which can result in flooding during heavy rainfall or storms. Additionally, the dumped refuse can also clog drainage systems, further exacerbating the risk of flooding. Therefore, the dumping of refuse can have detrimental effects on the natural drainage system, leading to an increased likelihood of flooding in the surrounding areas.

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  • 47. 

    47.A large area of land that is thickly covered with trees is known as …………..

    • A.

      (a)desert

    • B.

      (b)forest

    • C.

      (c)farmland

    • D.

      (d)bush

    Correct Answer
    B. (b)forest
    Explanation
    A large area of land that is thickly covered with trees is known as a forest. Forests are characterized by their dense vegetation and are home to a diverse range of plant and animal species. They play a crucial role in maintaining ecological balance, providing habitat for wildlife, and contributing to the overall health of the planet.

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  • 48. 

    48. Cutting down of trees and cleaning of forests is called……………

    • A.

      (a)afforestation

    • B.

      (b)deforestation

    • C.

      (c)regulation

    • D.

      (d) conversation

    Correct Answer
    B. (b)deforestation
    Explanation
    Deforestation refers to the process of cutting down trees and clearing forests. This activity is often done to make space for agriculture, urbanization, or the extraction of natural resources. Deforestation has significant negative impacts on the environment, including loss of biodiversity, disruption of ecosystems, and contribution to climate change.

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  • 49. 

    49.One danger of deforestation is…………….

    • A.

      (a)good soil

    • B.

      (b)good food

    • C.

      (c)increase in population of animals

    • D.

      (d)extinction of wildlife.

    Correct Answer
    D. (d)extinction of wildlife.
    Explanation
    Deforestation leads to the destruction of wildlife habitats, which can result in the extinction of various animal species. When forests are cleared, animals lose their homes and are forced to relocate or perish. This disruption in their natural environment can cause a decline in their population and, in some cases, lead to their complete extinction. Therefore, the correct answer is (d) extinction of wildlife.

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  • 50. 

    50. Which of this activity is associated with livestock/animals?

    • A.

      (a)Erosion

    • B.

      (b) bush burning

    • C.

      (c) mining

    • D.

      (d) overgrazing

    Correct Answer
    D. (d) overgrazing
    Explanation
    Overgrazing is the correct answer because it refers to the activity of allowing livestock to graze on a particular area for an extended period, leading to the depletion of vegetation and potential damage to the ecosystem. This activity is directly associated with livestock/animals as they are the ones responsible for the grazing. Erosion, bush burning, and mining are not specifically related to livestock or animals.

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Sep 25, 2020
    Quiz Created by
    Educationdistric
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