BIOL-1507EL Lecture Notes - Lecture 6: Pineapple, Multiple Fruit, Drupe
27 Jun 2018
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Biology 2 - Day 6
Reproduction and development in flowering plants
-Development of embryo
-Seed structure
-a) Common bean
-The leaf is the new plant (plumule)
-b) Caster bean
-The bean seed is an example of dicot seeds
-Corn kernel is an example of monocot seeds
Bean Seed
-If two halved of bean seeds are parted, you can see a rudimentary plant and its
called a plumule
-The epicotyl is the portion of the stem above the attachment of the cotyledons, and
the hypocotyl is the portion of stem bellow the attachment of the the cotyledons
-The radicle is the part of the embryo that contains the root apical cell, and becomes
the first root of the plant
Corn Kernel
-Corn kernels are actually fruit, and the outer covering is the pericarp
-The bulk of the good is storage tissue which is endisperm, and the cotyledon does
not play a role in storage
-The plumule snap radical are enclosed in a protective sheath, called coleoptile and
coleorhizae, respectively
-The plumule and the radicle burst through these covering when germination occurs
From seed to seedling
-The first step in germination of many seeds is the imbibition, the absorption of water
by the dry seeds
-The first organ to emerge from the germinating seed is the radicle (embryonic root)
-Next, the shoot tip must break through the soil surface, in many dicots a noole forms
in the hypocotyl and growth pushed the hook above ground
-Stimulated by light, the hypocotyl straightens, raising the cotyledons and epicotyl
-The epicotyl now spreads its plumule, the first foliage leaves expand and begin
making food by photosynthesis
-The cotyledons shrivel and fall away from the seeding
-Seed dormancy and germination
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Document Summary
The leaf is the new plant (plumule) The bean seed is an example of dicot seeds. Corn kernel is an example of monocot seeds. If two halved of bean seeds are parted, you can see a rudimentary plant and its called a plumule. The epicotyl is the portion of the stem above the attachment of the cotyledons, and the hypocotyl is the portion of stem bellow the attachment of the the cotyledons. The radicle is the part of the embryo that contains the root apical cell, and becomes the rst root of the plant. Corn kernels are actually fruit, and the outer covering is the pericarp. The bulk of the good is storage tissue which is endisperm, and the cotyledon does not play a role in storage. The plumule snap radical are enclosed in a protective sheath, called coleoptile and coleorhizae, respectively. The plumule and the radicle burst through these covering when germination occurs.
