Name the green dot like structures in some cells observed by a student when a leaf peel was viewed under a microscope. What is this green colour due to?
Name the green dot like structures in some cells observed by a student when a leaf peel was viewed under a microscope. What is this green colour due to?
The green dot-like structures observed in the cells are cell organelles called chloroplasts. This green colour is due to the presence of a pigment called chlorophyll.
Marking Scheme
- 1Identification of green dots as chloroplasts (0.5 marks)
- 2Identification of the pigment as chlorophyll (0.5 marks)
Hint
Recall the cell organelle responsible for photosynthesis and the pigment it contains.
Quick Oral Answer
The green dots are chloroplasts. They contain chlorophyll, which captures sunlight to help the plant make food through photosynthesis.
Analysis & Explanation
According to the NCERT text, when a cross-section of a leaf is observed under a microscope, certain cells show green dots. These dots are identified as chloroplasts, which are specialized organelles. The green pigment contained within these chloroplasts is chlorophyll, which is essential for the absorption of light energy during photosynthesis.
Common Mistakes
- 1Confusing the organelle (chloroplast) with the pigment (chlorophyll).
- 2Spelling 'chlorophyll' or 'chloroplast' incorrectly.
Interesting Facts
Chlorophyll reflects green light, which is why leaves appear green to our eyes.
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Frequently Asked Questions
How many marks does this question carry in CBSE Class 10 Science 2010?
This question carries 1 mark in the CBSE Class 10 Science 2010 examination.
Which chapter does this question come from in Science?
This question is from the chapter "Life Processes" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Autotrophic Nutrition" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2010 paper?
This is a Very Short Answer question from Section B in the CBSE Class 10 Science 2010 paper.