mpt-92593 Where does the shoot apical meristem, cells capable of repeated divisi
ID: 218720 • Letter: M
Question
mpt-92593 Where does the shoot apical meristem, cells capable of repeated division form on a dicot embryo? Select one: a. At the tips of the cotyledons. b. Equal distance between the cotyledon tips and the root tip o c. Between the two cotyledons. d. At the root tip. Which of the following does not occur during seed maturation? Select one: a. The embryo takes on starch it will need for early development b. The embryo takes on water it will need to carry out photosynthesis. O c. The seed coat hardens.Explanation / Answer
Answer 1:
The formation of Shoot apical meristem is a complex process of embryonic development. Shoot apical meristems are multipotent stem cells which gives rise to primordia which ultimately gives rise to the vegetative body above the ground of the plant. The embyonic development of Shoot apical meristme involves the co-ordination of complex genes which are called homebox genes to determine the stem cell niche. Thus, during the stem cell development and embryogenesis, the Shoot apical meristem is confines between the two cotyledons in a heart shape pattern.
Answer 2:
Seed maturation is the stage after embryogenesis has taken place and the seed is shed. The seed now have to decide weather to germinate or to go to dormancy. This is decided by a number of environmental factors and signalling pathways inside the seed.
So, seed maturation always involves intake of water and nutrients from the surrounding. It does not involves the hardening of seed coat because seed coat hardening is only required in the dormant stage where the seed need to overcome unfavourable conditions.
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