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Name the following

(i) A diploid nucleus in central cell of embryo sac in plants.

(ii) A condition of flowers where its sex organs are exposed.

(iii) Components necessary to induce germination of pollen in synthetic medium.

(iv) The plant material in which double fertilization was discovered.

(v) A condition in which pollen tube enters the ovule through micropyle, through chalaza or through integuments.

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(i) Secondary nucleus or definitive nucleus

(ii) Chasmogamy.

(iii) Sucrose and boric acid.

(iv) Liliaceae plants like Lilium and Fritillaria.

(v) Porogamy, chalazogamy and mesogamy respectively.

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