Biology Questions and Answers
Lateral, or secondary, meristems, are
the cambium known as cork cambium), tissues fand the phellogen (alsorom (^)
the stem, branches and roots that by
mitosistissues participate i generate other tissues. Thn the secondaryese
growth of plant, i.e., in the thickening of
the stem, branches and roots.
- What are the main features
of the meristematic cells? Why
do these cells need to have a
high mitotic rate?
Meristematic cells have very thin cell
walls, small vacuoles, a wnucleus and they are constantlyell-centralized
undergoing mitosis. Meristematic cells
need a high mitoticare responsible for the plant growth. rate because they
- What is the best
identification hypothesis for a
plant tissue seen under the
microscope having most cells
undergoing cell division?
The best hypothesis is that the tissue is
a sample of meristematicMeristematic tissues seen under the tissue. (^)
microscopmitosis. e have many cells undergoing
- Which are the plant tissues
responsible for the supporting
of the plant?
The plant supporting tissues are the
collenchyma and the sclerenchyma.
The collenchyma is made of living andelongated cells that accumcellulose and pectin in some rulateegions of (^)
the cell wall making them unequally
thick and thus providing flexibility.
The sclerenchyma is made mostly of
dead cells killed by lignin deposition(lignin is an impermeable biopolymer) (^)
forming elongated, rigid and
impermeable fibers. This a plant tissue widely used in thee sclerenchyma
textile industry.
- Which is the plant tissue
responsible for the filling of
the space between other
tissues?
The plant-fillincalled parenchyma. Tg tissue is gehe plantnerically
parenchyma can bphotosynthetic parenchyma, a tissuee divided into (^)
that has cells with many chlorand a high photosynthesis rate foundoplasts (^)
mainly in leaves, and storage
parenchyma, spof water (e.g., in cactus),ecialized in starchthe storage or air
(e.g., in aquatic plants).
- Where in the leaves is the
photosynthetic tissue often
located?
The main pphotosynthhotosynthetic parenchyma (also knetic tissue is theown (^)
as chlorcollenchyma) oenchyma, ften located bdo not confuse withetween the (^)
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