a garrison of 2000 men has provision for 45 days.at the end of 15 days reinforcement arrives and it is found that now the provisions would last for 20 days more. what is the strength of reinforcement
Answers
Step-by-step explanation:
it from a pond having stagnant water
and aquatic plants. Add some wheat grains
and aquatic plants to it. Keep it for 3 – 4 days
so that wheat grains & plants will decompose.
Early in the morning on fourth day, take a
glass slide and put a drop of that water over
it. Carefully, put a cover-slip on that drop and
observe under compound microscope.
You will be able to see many paramecia
performing the binary fission.
Prokaryotes (Bacteria), Protists (Amoeba,
Paramecium, Euglena, etc.) and eukaryotic
cell-organelle like mitochondria and
chloroplasts perform asexual reproduction by
binary fission. In this process, the parent cell
divides to form two similar daughter cells.
Binary fission occurs either by mitosis or
amitosis.
Axis of fission / division is different in
different protists. Ex.: Amoeba divides in any
plane due to lack of specific shape; hence it is
called as ‘simple binary fission’. Paramecium
divides by ‘transverse binary fission’ whereas
Euglena by ‘longitudinal binary fission’.
Binary fission is usually performed by
living organisms during favourable conditions
i.e. availability of abundant food material.
2. Multiple Fission
Asexual reproduction by multiple fission is performed by Amoeba and other similar
protists. Amoeba stops the formation of pseudopodia and thereby movements whenever
there is lack of food or any other type of adverse condition. It becomes rounded and forms
protective covering around plasma membrane. Such encysted Amoeba or any other protist
is called as ‘Cyst’.
Many nuclei are formed by repeated nuclear divisions in the cyst. It is followed by
cytoplasmic division and thus, many amoebulae are formed. They remain encysted till
there are adverse conditions. Cyst breaks open on arrival of favourable conditions and
many amoebulae a