What happens by the fifth day of the globular stage?
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The first evidence of histodifferentiation is detected.
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What happens by the fifth day of the globular stage?
The first evidence of histodifferentiation is detected.
What is somatic embryogenesis?
Formation of embryos from adult cells in tissue culture.
What occurs during the first asymmetric cell division?
It results in a smaller apical cell and a larger basal cell, establishing polarity.
What is the function of the suspensor in plant embryo development?
It serves as a short, filamentous organ that develops from the basal cell.
What meristems are established during the torpedo stage?
The specific meristems are not mentioned in the text.
What occurs to embryogenesis at the end of the torpedo stage?
It is arrested, and the mature seed desiccates and remains dormant until germination.
What is the typical first division of the zygote in angiosperms?
Transverse to its long axis.
What should be observed in the Capsella bursa embryo?
Several embryos of different stages.
What is the globular stage of embryo development characterized by?
A globular mass with cells arranged in regular tiers, consisting of fewer than 40 cells.
What shape do upright cotyledons give the embryo during the torpedo stage?
A torpedo shape.
When is embryonic development considered to be terminated?
At the onset of seed dormancy.
What are the two approaches used to study plant embryogenesis?
Experimental embryology and genetic dissection.
What is the first step in observing the Capsella bursa embryo?
Mount the Capsella bursa fruit longitudinally and observe under a microscope.
What happens to the suspensor during the torpedo stage?
It is degenerating.
What forms the root-shoot axis of the plant embryo?
The elongation of the axis as cotyledons enlarge.
What are the three basic tissue systems recognized during the globular stage?
The three basic tissue systems are not specified in the text.
What initiates the formation of the root cap in the torpedo stage?
Periclinal divisions in a plane parallel to the surface.
What is the more or less spherical embryo called?
Globular stage embryo.
What type of divisions occur in the surface cells during histodifferentiation?
Divisions become progressively restricted to the anticlinal plane.
What marks the beginning of a vascular plant's life?
A single, fertilized egg.
