General Science | Grade 08|Unit 04 Exercise

To Test Your Knowledge Click here Quiz  Unit 04

A. MCQs :

  1. The most effective method to prevent a disease is
    a. surgery
    b. organ transplant
    c. vaccination*
    d. radiotherapy
  2. If a nitrogen-fixing gene from cyanobacteria is successfully inserted in plant root cells:
    a. plant roots will fail to grow.
    b. plant roots will fix nitrogen.*
    c. plant roots will develop cyanobacteria inside.
    d. plant roots will kill cyanobacteria.
  3. A genetically modified rice variety with more iron content will help to treat:
    a. anaemia.*
    b. night blindness.
    c. rickets.
    d. colour blindness.
  4. Deficiency of insulin in human causes:
    a. diabetes.*
    b. heart disease.
    c. hypertension.
    d. epilepsy.
  5. Which of the following can be used as a biofuel?
    a. Kerosene oil
    b. High octane
    c. Methane
    d. Ethanol*
  6. Which of the following is not a product of biotechnology?
    a. Polythene*
    b. Insulin
    c. Human growth hormone
    d. Thymosin
  7. Baking process uses enzymes from:
    a. wheat.
    b. rice.
    c. corn.
    d. yeast.*
  8. A gene from one organism can be inserted into another one by:
    a. tissue culture.
    b. cloning.
    c. genetic engineering.*
    d. hybridization.
  9. What could be the advantage of using microorganisms like bacteria to get useful products by genetic engineering?
    a. Bacteria grow at a very fast rate*
    b. Bacteria cannot be seen with naked eye.
    c. Bacteria cause infections.
    d. Bacteria die very soon.
  10. The best solution to hereditary diseases is:
    a. vaccination.
    b. immunization.
    c. chemotherapy.
    d. gene therapy.*

 

 

B. Short Questions :

  1. What could be the advantages of microbe-produced dyes over synthetic dyes?
    • Microbe-produced dyes are eco-friendly, biodegradable, and non-toxic. They reduce environmental pollution and use renewable resources, unlike synthetic dyes.
  2. Give the advantages of using biodegradable plastic.
    • Biodegradable plastic reduces environmental waste, decomposes naturally, and lowers pollution levels, contributing to sustainable waste management.
  3. What is the significance of fermented food?
    • Fermented food is rich in probiotics, aids digestion, boosts immunity, and enhances the nutritional value of food by breaking down complex nutrients.
  4. How can biotechnology transform the way of treating diseases?
    • Biotechnology enables gene therapy, development of personalized medicines, production of vaccines, and innovative treatments like immunotherapy.
  5. What could be the best solution to mineral deficiency diseases in third-world countries?
    • Biofortification of crops, development of supplements, and ensuring food security with fortified food can address mineral deficiencies effectively.

C. Long Questions :

  1. Explain how biotechnology is helping to solve issues of food shortage.
    • Biotechnology helps increase crop yields through genetically modified (GM) crops, develops pest-resistant plants, enhances nutritional value through biofortification, and creates drought-tolerant varieties. It also enables efficient use of resources and reduces reliance on chemical fertilizers.
  2. What are the applications of biotechnology?
    • Applications include:
      • Medicine: Production of vaccines, gene therapy, and diagnostics.
      • Agriculture: GM crops, pest-resistant plants, and biofertilizers.
      • Environment: Bioremediation, waste management, and production of biodegradable materials.
      • Industrial: Enzymes for food, textiles, and biofuel production.

D. Structured Question :

  1. Think like a biotechnologist:

Steps to solve plastic pollution in water bodies using the mushroom:

    • Step 1 : Identify mushroom genes responsible for plastic breakdown.
    • Step 2: Genetically engineer bacteria or algae to incorporate these genes.
    • Step 3: Release these modified organisms into water bodies to break down plastic pollution.

 

To Test Your Knowledge Click here Quiz  Unit 04