Branch roots originate in the pericycle while stem do not
Stems are always bove the ground while root are always below the ground
Stems are positively geotropic while roots are negatively geotropic
Stem are sometime used for storage while roots are never used
Stems grow in both length and circumference while root grow only in length
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Stems originate from the shoot apical meristem (SAM) during embryonic development. The shoot apical meristem is a region of undifferentiated cells located at the tip of a shoot, and it gives rise to all the aerial parts of the plant, including stems, leaves, and flowers.
The significant difference between roots and stems is that:
A. Branch roots originate in the pericycle while stems do not.
Explanation:
- Branch roots originate from the pericycle, which is a tissue layer in the root, while stems do not have this structure.
- Stems can have different functions and structures, including storage, but the origin of branch roots in the pericycle is a unique feature of roots.
This question is OAU PUTME 2008, No 23. and the answer is A, i agree with those that said that not all stems are above the ground or positive geotropic, so A is more obvious in all plants.
No significant in the question is not obvious but d most important difference. Most of d options are correct but A is more significant. The pericycle is in the endoderm and that is where the branch root originate from
some stems grow underneath the ground and some roots grow above the soil level, e.g swamp plants. There isn't enough oxygen below the ground so they tend to grow upwards, where there is more oxygen so it can't be option B
Branch roots arise in the pericycle (a cylinder of parenchyma cells lying just inside the endodermis).
After seed germination, radicle (part of embryo),
develops into the first root. The radicle may develop
into tapered taproot. Thinner branch roots arise from
tapered taproot.
i tot " significant" mean somtn obvious,xo y s d ansa talkin about d inner diff,nd nt somtn we can c
Its nt be becos not all stems are always above the ground, creeping plants and not always above the ground
if they choose to keep it at a it is because the root originates at the epidermis while the branch originates at the pericycle but i'd go for b sha
the answer is C...roots are negatively geotrophic while stem are positively geotrophic.
