Class 12 Biology Reproduction Sexual reproduction in Flowering Plants



Suspensor formation in Sagittatia occurs at ............  celled  stage.
(a)
6--10
(b)
4--5
(c)
2--3
(d)
Single
Correct answer: (d) 
Solution: In general, zygote divides into two unequal cells, larger suspensor cell towards micropyle and a smaller embryonal cell towards antipodal region. The suspensor cell undergoes transverse divisions forming 6 to 10 celled long suspensor. The first cell of the suspensor is large and is called as haustorium or vesicular cell. The last cell of suspensor is known as hypophysis. It forms a radicle tip. Whereas in Sagittaria type: the early development of dicot and monocot embryos are similar upto octant stage. Later on the differentiation starts. Suspensor is single celled. The zygote of oospore divides transversely producing a vesicular suspensor cell towards micopylar end and embryo cell towards chalazal end. The embryo divides transversely again into a terminal and a middle cell. The terminal cell divides vertically and transversely into globular embryo. It forms a massive cotyledon and a plumule. Growth of cotyledon pushes the plumule to one side. Remains of second cotyledon occur in some grasses. It is called epiblast. The single cotyledon of monocots is called scutellum.

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Similar topics
sexual reproduction in flowering plants
reproduction in organisms
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sexual reproduction in flowering plants
reproduction in organisms
evolution
human reproduction
reproductive health