Question

Embryo sac Micropyle
Embryo sac Micropyle
Refer to the given diagram and select the correct option
(a) Chalaza
Female
gametophyte
(b) Chalaza
Nucellus
(c) Micropyle Egg
(d) Micropyle Nucellus
Embryo sac Chalaza
Embryo sac Chalaza
regarding processes P, Q and R.
O
7
Plant Y
Plant X
8.
(a) Processes P, Q and R introduce genetic variabilit
in the offspring of sexually reproducing plants »
and Y.
(b) Wind serves as agent for process Q if plants X and
Y belong to Genus Salvia.
(c) Flowers of plants X and Y need to produce odour
and nectar for completion of processes P and Qi
they are entomophilous.
(d) If plants X and Y belong to Genus Cannabis, then
their flowers need to produce sticky and heavy
pollens in very small amount for accomplishment
of process Q.
The given figures show two kinds of fruits.
도​

Answer 1

Answer:

In flowering plants, the embryo sac is small-sized and consist of seven cells and eight nuclei. The cell closest to the micropyle opening of the integuments differentiated into egg cell with two synergies cells. Three antipodal cells form on the opposite end i.e chalazal end of the ovule. The large central cell of the embryo sac contains two polar nuclei.

In angiosperm polygonum type of embryo sac is most common in polygonum type embryo sac meiosis occurs in diploid mother cell in the nucellus which produces four haploid megaspore. Three of megaspore usually which are present at the micropyle end of nucellus undergoes programmed death so we get only one functional megaspore.

Thus, 'Only (a) and (c)' is the correct answer.

Explanation:

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