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The principle of limiting factors was formulated by Blackman (1905). It states that when a process is conditioned as to its rapidity by a number of separate factors, the rate of process is limited by the pace of slowest factor.

1. 85–90% of all photosynthesis of world is carried out by phytoplanktons in ocean. 10% of total photosynthesis is performed by land plants.
2. Algae are the most efficient photosynthesising organisms.
3. Algae are believed to be a good source of renewable energy because of its rapid growth rate and its ability to be cultivated in waste water or waste land. Several companies and government agencies are making efforts to reduce capital cost and operating costs and make algae fuel production commercially viable.
4. Depending upon their colour, plastids are of three main types – leucoplasts, chromoplasts and chloroplasts.

Correct answer: 85–90% of all photosynthesis of world is carried out by phytoplanktons in ocean. 10% of total photosynthesis is performed by land plants.

Solution

The correct option states that phytoplankton in the oceans perform the vast majority of global photosynthesis, which is a standard ecological fact. The other choices discuss efficiency, biofuel potential, or plastid classification, so they do not match the given answer.

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