CELLS:
EXTRA QUESTIONS
Q1: How and why tumour is caused?
Ans: Our body
grows when cells in our body give rise to new cells. Cells have a unique
mechanism to know when to stop producing new cells and when to start. However,
when cells lose this unique ability, they keep producing new cells, which
results in formation of unwanted mass of cells in the body. This mass is
nothing but tumour which may or may not lead to cancer.
Q2: Write about contribution of A.V. Leeuwenhoeck
and Robert Hooke in discovery of cell.
Ans: A. V. Leeuwenhoeck (1632-1723) constructed the
basic microscope to see bacteria from his own mouth.
The term ‘cell’ was first coined by Robert Hooke in
1665 while examining a thin slice of cork that resembled boxes of honeycomb.
The study of cells is called cell biology.
Q3: Draw a few unicellular organism demonstrating
different cell shape examples.
Ans: Draw structure of rod shaped lactobacillus
(bacteria), irregular amoeba (protozoa), budding yeast (fungi) and round shaped
chlorella (algae).
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