Biology
The diagram given below depicts a defect of the human eye which has been corrected by using a suitable lens. Answer the following questions:
(i) Name the defect that has been corrected. Which type of lens has been used for the correction?
(ii) Mention one cause for the above defect.
(iii) Where would the image have formed if the above lens was not used for correction?
(iv) Name the three concentric layers of the eyeball.
(v) Draw a neat, labelled diagram of a neuron.
Sense Organs
ICSE 2020
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Answer
(i) Myopia is the defect that has been corrected. Concave lens has been used.
(ii) Lens is too curved.
(iii) The image would have been formed in front of retina if the above lens was not used for correction.
(iv)
- Outer- Sclera
- Middle- Choroid
- Inner - Retina
(v) Diagram of a neuron with the parts labelled is shown below:
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The diagram given below represents the simplified pathway of the circulation of blood. Answer the questions that follow:
(i) Name the blood vessels labelled 1 to 4.
(ii) Which blood vessel supplies oxygenated blood to the muscles of the heart?
(iii) What is the importance of blood vessel labelled 5?
(iv) What is the type of blood circulation that takes place between the heart and the lungs?
(v) Draw a diagram of the different blood cells as seen in a smear of human blood.
The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the questions that follow:
(i) Which factor is being studied here?
(ii) What is the purpose of keeping KOH in the flask?
(iii) Explain the term Photosynthesis.
(iv) What will you observe when the leaf A is tested for starch?
(v) Write a well balanced chemical equation for the process of photosynthesis.
The figure given below shows a part of a nephron.
Answer the questions that follow:
(i) In which region of the kidney is the above structure present?
(ii) Label the parts numbered 1 to 4.
(iii) What is the technical term for the process that occurs in part 3?
(iv) Why is fluid X not called urine? Justify your answer.
(v) Draw a neat, labelled diagram of the urinary system of man.
Give the biological reasons for the following statements:
(i) It is advisable to keep green plants in an aquarium.
(ii) Water pollution is a major cause of concern in our country.
(iii) We cannot distinguish colours in dim light.
(iv) Medical discoveries such as antibiotics and vaccinations have indirectly contributed to the sharp rise in human population.
(v) Homo sapiens sapiens is the most highly evolved form of man.