A) Nearly 90 per cent of photosynthesis is carried out by algae.
B) All algae are autotrophs and they synthesize starch.
C) Algae exhibit only haplontic type life cycle.
D) Algae are useful plants on the earth as they produce food, fibres and medicines.
Correct Answer: A
Solution :Maximum photosynthesis on earth is carried out by algae, especially those growing in oceans (over 90% of the total photosynthesis). Some algae are parasitic also and thus do not photosynthesize. Only chloro- phycean algae produce true starch, in brown and red algae, laminarian and floridian starches are produced respectively which are complex polysaccharides. In algae, the life cycle, is usually haplontic type but diplontic and haplo-diplobiontic type life cycle have also been observed. Algae are always devoid of fibres. Hence, the correct option is [a].
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