Which of the following is an incorrect statement? (1) Flowers of pea, Crotalaria, and Vinca are ...

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Which of the following is an incorrect statement?
(1) Flowers of pea, Crotalaria, and Vinca are used to study pollen germination.
(2) In most angiosperms pollen grains are shed at threecelled condition.
(3) Emasculation is not needed, if the female parent produces unisexual flowers.
(4) Pollen tube enters the ovule through the micropyle.
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