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Phytoplankton are microscopic autotrophs that are the foundation of many
aquatic food chains. The amount of photosynthesis carried out annually by ocean
phytoplankton alone is of a similar magnitude to that of all terrestrial plants
combined, making them an important subject for ecological research. Ocean
phytoplankton photosynthesis can be studied using a wide range of techniques, from satellite imaging to measure whole oceans to collecting small samples and analysing their behaviour in the laboratory.
(a)In recent years phytoplankton have been investigated as a potential source of energy for humans. Researchers have therefore been interested in whether these organisms could be ‘farmed’ to provide food or fuel. In terms of biomass, Gross Primary Production (GPP) in phytoplankton living in a layer just below the surface of a typical ocean area is 4102 g m−2 yr−1 If you . assume the energy value of phytoplankton is 6 kJ g−1, calculate the GPP in terms of kJ m−2 yr−1 .Show your working clearly .
(b) If a human needs to eat about 10 000 kJ per day, estimate (to the nearest gram) the mass of phytoplankton that would be required to meet their daily energy requirements. Based on this value, approximately what proportion of her own body weight in phytoplankton would a 60 kg woman need to eat over the course of a year, if this were her only source of energy? Show your working clearly.
(c) Farming phytoplankton to harness solar energy for human food or fuel would presumably require cultivating large numbers of these organisms in a carefully designed artificial environment. Suggest two features that could be incorporated into the design of a phytoplankton ‘farm’ to optimise the Net Primary Production (NPP). Briefly describe why each design feature would be useful. (One sentence for each)
- Key Points and Differences with egg and sperm donation.
- Research egg and sperm donation for use in IVF.
I seriously need some help with my science homework! You have to fill in the gaps with the words below. You do not need to use all of the words:
When whole animals and grow they get bigger. This happens because their cells divide by cell . One cell can to make two new ___cells.
Cells of the same kind can make a . Different types of tissues make . Organs can work together in an organ . The heart is an organ made from and nerve . It is part of the ____system.
The lungs are part of the system. The brain is part of the system. Food is broken down in the _________ system.
The words are:
DAUGHTER DIVIDE DIVISION PLANTS REPRODUCE SON BLOOD BREATHING CIRCULATORY DIGESTIVE MUSCLE NERVE NERVOUS ORGANS SYSTEM TISSUE TISSUES.
Thank you so much!!! Cerys