3. 5. Answer these questions: 1. The scedless plants are called 2. The gas evolved during photosynthesis is The plant that lives in the dark is called The largest group of plants is The tallest tree is The expanded part of Thalamus is The flowering plants are called The harmful substance present in tobacco is The food crop that has the maximum content of proteins is The fungus that yields penicillin is An edible fungus 6. 7. 8. 9. 10. 11. 12. Spirogyra is commonly known as 13. The receptive surface area of the carpel is 14. The vegetable that has low calorific value is 15. The heaviest plant is The final product of the photosynthesis in plants is The rubber vulcanising process was started by 18. An example for annuals
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It would be impossible to overestimate the importance of photosynthesis in the maintenance of life on Earth. If photosynthesis ceased, there would soon be little food or other organic matter on Earth. Most organisms would disappear, and in time Earth’s atmosphere would become nearly devoid of gaseous oxygen. The only organisms able to exist under such conditions would be the chemosynthetic bacteria, which can utilize the chemical energy of certain inorganic compounds and thus are not dependent on the conversion of light energy.
Energy produced by photosynthesis carried out by plants millions of years ago is responsible for the fossil fuels (i.e., coal, oil, and gas) that power industrial society. In past ages, green plants and small organisms that fed on plants increased faster than they were consumed, and their remains were deposited in Earth’s crust by sedimentation and other geological processes. There, protected from
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