ICSE Class 8 Biology Important Questions

Biology is the science of life that involves the study of living organisms, together with their chemical compositions, physical compositions, functions and features. The word Biology springs from the Greek word “bios”, which implies “life”, and “logos”, which implies “study”. The fundamentals of Biology, with respect to Class 10 Biology, is emphasised from class 8 in ICSE and hence, is very crucial to score in the subject. For the benefit of the students of ICSE Class 8, we have compiled all the important questions of Biology prepared by our subject experts.

ICSE Class 8 Biology important questions mentioned below will help you prepare well for your examination. These important questions of Biology are framed in such a way so that students can get an overview of what topics are more important from the exam point of view. Students should practise these ICSE Class 8 Important Questions of Biology once they complete studying the entire syllabus so that they will get to know where they stand in terms of preparation.

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The ICSE Class 8 important questions of Biology are framed according to the prescribed ICSE Class 8 Biology syllabus which will help students to revise the entire syllabus in a short duration.

1. Choose the correct answer out of the four available choices given below each question.
   1. Pulmonary vein carries
      1. Oxygenated blood
      2. Deoxygenated blood
      3. Glucose-rich blood
      4. CO2 laden blood
   2. Water from the soil enters the root xylem by the process of
      1. Diffusion
      2. Active transport
      3. Osmosis
      4. Both (a) and (b)
   3. Breathing is controlled by which part of the brain/brainstem?
      1. Cerebrum
      2. Cerebellum
      3. Medulla Oblongata
      4. Pons

2. Give a scientific word for the following:
   1. An instrument used to measure blood pressure.
   2. Ailment caused due to the enlargement of the thyroid gland.
   3. The age at which a human develops secondary sexual characters.
   4. A place where bees are reared and grown artificially to obtain wax, honey and other important products.
   5. Disease-causing germs.

3. Fill in the blanks and rewrite the sentences:
   1. Conversion of glycogen into glucose is facilitated by the _____ enzyme.
   2. _________is the seat of intelligence and consciousness.
   3. Penicillin is obtained from_______.
   4. Overconsumption of alcohol causes_______.
   5. _______are absorbed through active transport by the roots.

4. 4. Match the items in column I with the appropriate items in column
      II.

5. 5. Study the diagram below and answer the questions that follow:

5. 1. Label the parts labelled A, B and C.
   2. Write the functions of part A and part C.

6. What is a food chain? Explain with the help of a neat and well-labelled diagram.

7. Name the following
   1. Three freshwater edible fish of India.
   2. of oil seeds used as cattle feed after the extraction of oil.
   3. A cross-breed of hens.
   4. A Kashmiri goat is known for its expensive wool.
   5. Most widely used silkworm for sericulture.

8. Give one point of difference between the following on the basis of what is given in the brackets:
   1. Arteries and Veins (Type of blood carried)
   2. Mint plant and Potato (Reproduction)
   3. Muscle and Glands (Response to nerve impulse)
   4. Adrenal medulla and Adrenal cortex (Hormone secreted)
   5. Hay fever and Leukemia (Type of disease) i.

9. Below given are some diseases. Identify the cause of the disease and mention one food source of the causative component.
   1. Beri-beri
   2. Rickets
   3. Goitre
   4. Pellagra
   5. Anemia

10. State one function of each of the following:
    1. Pericardium
    2. Left Ventricle
    3. White blood cells
    4. Haemoglobin
    5. Liver

11. Define the following terms:
    1. Microbiology
    2. Endangered Species
    3. Deforestation
    4. Nuclear energy
    5. Wildlife

12. Describe the characteristics of insect and water pollinated
    flowers.

13. Explain the significance of testes lying within the scrotum.

14. Why one should avoid eating polished rice?

15. If you spray a room freshener from a bottle in one end of a hall, will your friend at the other end of the hall be able to smell it? Explain your answer scientifically.

16. Give scientific reasons
    1. Adolescents need to plan their diet and lifestyle to maintain a
       healthy body.
    2. Yeast is used in bakery products.
    3. The scrotum lies outside the body cavity.

17. A man was suffering from diabetes. He was urinating frequently in copious amounts resulting in loss of water. Which type of diabetes is this, and which hormone is responsible for it?

18. What is the food pyramid? What is the role of the food pyramid in the functioning of ecosystems?

19. Explain the method of asexual reproduction in plants by anyone sub-aerial stem.

20. What is a reflex arc? Answer the following in the correct sequence:
    1. A sensory neuron conducts the impulse from the receptor to the spinal cord.
    2. A receptor receives a stimulus.
    3. The motor neuron passes the impulse to an effector, which carries out the action in response to the stimulus.
    4. An association neuron transmits the impulse from the sensory neuron to a motor neuron.

Benefits of Solving ICSE Class 8 Biology Important Questions

• It helps them to solve any type of question asked in the exam with confidence.
• These important questions cover all the essential points that need to be studied from the exam point of view.
• With the help of the ICSE important questions, students can evaluate their overall performance.
• It helps while revising the Biology syllabus quickly.