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Class 7 Science Chapter 10 Crossword - Photosynthesis (with Solutions)

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FAQs on Class 7 Science Chapter 10 Crossword - Photosynthesis (with Solutions)

$1. What is the process of photosynthesis?
Ans.Photosynthesis is the biochemical process by which green plants, algae, and some bacteria convert light energy, usually from the sun, into chemical energy in the form of glucose. This process occurs mainly in the chloroplasts of plant cells, where chlorophyll captures light energy. The overall equation for photosynthesis can be simplified as: carbon dioxide + water + light energy → glucose + oxygen.
$2. Why is photosynthesis important for life on Earth?
Ans.Photosynthesis is crucial for life on Earth as it is the primary source of organic matter for nearly all organisms. It produces oxygen as a by-product, which is essential for the survival of aerobic organisms. Additionally, photosynthesis helps regulate atmospheric carbon dioxide levels, contributing to the global carbon cycle and mitigating climate change.
$3. What are the main stages of photosynthesis?
Ans.Photosynthesis consists of two main stages: the light-dependent reactions and the light-independent reactions (Calvin cycle). In the light-dependent reactions, which occur in the thylakoid membranes, sunlight is absorbed and converted into chemical energy in the form of ATP and NADPH. The light-independent reactions take place in the stroma, where ATP and NADPH are used to convert carbon dioxide into glucose.
$4. What factors affect the rate of photosynthesis?
Ans.The rate of photosynthesis is influenced by several factors, including light intensity, carbon dioxide concentration, temperature, and the availability of water. Optimal levels of these factors promote higher rates of photosynthesis, while extreme conditions can hinder the process. For instance, low light intensity or insufficient carbon dioxide can limit glucose production.
$5. How do plants adapt their photosynthesis process in different environments?
Ans.Plants have developed various adaptations to optimize photosynthesis in different environments. For example, in arid conditions, some plants (like succulents) use a modified form of photosynthesis called CAM (Crassulacean Acid Metabolism), which allows them to open their stomata at night to reduce water loss. Additionally, shade-tolerant plants have adaptations that allow them to maximize light absorption in low-light conditions.
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