Question

Explain the following terms a) metaxenia
b) xenia
c) nemec phenomenon

Answer 1

■A■

Metaxenia:

the effect of a pollen parent on the developing maternal tissues of a seed or fruit outside the embryo and endosperm due to hormones produced by the embryo and endosperm after double fertilization

■B■

xenia:

Xenia (also known as the Xenia effect) in plants is the effect of pollen on seeds and fruit of the fertilized plant. ... The term metaxenia was later coined and is still sometimes used to describe the effects on purely maternal tissues.

■C■

nemec phenomenon :

Pollen embryo sacs are also called NEMEC PHENOMENON, as Nemec discovered them for the first time. According to Nemec, pollen embryo sacs are produced by the repeated divisions of vegetative nucleus while the generative nucleus degenerates.

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Answer 2

Answer:

Explanation:

xenia : effect of pollen grain on endosperm

metaxenia : effect of  pollen parent n the maternal tissues of a seed or fruit outside the embryo and endosperm due to harmones by embryo and endosperm  after double fertilisation

nemnec phenomena: According to sir nemenc pollen embryo sacs are produced by repeated divisions of vegetative cell while the generative cell degenerates  

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