With reference to factors affecting the rate of
photosynthesis, which of the following statements is
not correct ?
(1) Tomato is a greenhouse crop which can be grown
in ``CO_2``-enriched atmosphere for higher yield
(2) Light saturation for ``CO_2`` fixation occurs at 10%
of full sunlight
(3) Increasing atmospheric ``CO_2`` concentration up to
0.05% can enhance ``CO_2`` fixation rate
(4) ``C_3`` plants respond to higher temperatures with
enhanced photosynthesis while ``C_4`` plants have much lower
temperature optimum