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Title: Fundamental Unit of life - Cell
Description: exercises and question with answers
Description: exercises and question with answers
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1
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In 1665, he used
self-designed microscope to observe cells in a cork slice
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Why is the cell called the structural and functional unit of life?
Answer
Cells are called the structural and functional unit of life because all the
living organisms are made up of cells and also all the functions taking
place inside the body of organisms are performed by cells
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How do substances like CO2 and water move in and out of the cell?
Discuss
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When the concentration of CO2and water is higher in external
environment than that inside the cell, CO2and water moves inside the
cell
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2
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This
means that the plasma membrane allows the entry of only some
substances and prevents the movement of some other materials
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Fill in the gaps in the following table illustrating differences
between prokaryotic and eukaryotic cells
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Size: generally small ( 1-10 µm) 1 µm== 10-6 m
1
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Nuclear region: _____________________________ and is known as
________
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Nuclear region: well-defined and surrounded by a nuclear membrane
3
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More than one chromosome
4
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___________________________________________
Answer
Prokaryotic cell
Eukaryotic cell
1
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Size: generally large (5-100 µm)
2
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Nuclear region: well-defined and surrounded by a nuclear membrane
3
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More than one chromosome
4
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Membrane-bound cell organelles such as mitochondria, plastids, etc
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Can you name the two organelles we have studied that contain their
own genetic material?
Answer
Mitochondria and plastids
2
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This may stop all the
life activities and may result in its death
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Why are lysosomes known as suicide bags?
Answer
Lysosomes are called suicide bags because in case of disturbance of
their cellular metabolism they digest their own cell by releasing own
enzymes
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Where are proteins synthesized inside the cell?
Answer
The proteins are synthesized in the Ribosome inside the cell
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Make a comparison and write down ways in which plant cells are
different from animal cells
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They have cell wall made up of cellulose
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They contain chloroplast
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They do not have centrosome
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Vacuoles are larger in size
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Lysosomes are absent or very few in number
Subunits of Golgi bodies known as dictyosomes are present
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2
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Most eukaryotic cells are multicellular
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5- 5 µm)
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Nuclear region is poorly defined due to the absence of a nuclear
membrane or the cell lacks true nucleus
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It contains a single chromosome
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Nucleolus is absent
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Membrane-bound cell organelles such as plastids, mitochondria,
endoplasmic reticulum, Golgi apparatus, etc
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Cell organelles such as mitochondria, plastids, endoplasmic reticulum,
Golgi apparatus, lysosomes, etc
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Cell division occurs only by mitosis
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Prokaryotic cells are found in bacteria and blue-green algae
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3
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Thereafter the protoplasmic material will be disappeared and the cell
will die
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What would happen to the life of a cell if there was no Golgi
apparatus?
Answer
Golgi apparatus has the function of storage modification and packaging
of the products
...
5
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6
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7
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Inside the food vacuole, complex substances are
broken down into simpler ones which then diffuse into the cytoplasm
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8
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9
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One of these potato cups should be made from a boiled potato
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Now,
(a) Keep cup A empty
(b) Put one teaspoon sugar in cup B
(c) Put one teaspoon salt in cup C
(d) Put one teaspoon sugar in the boiled potato cup D
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Then observe the four potato cups and
answer the following:
(i) Explain why water gathers in the hollowed portion of B and C
...
Answer
(i) Water gathers in the hollowed portions of set-up B and C because
water enters the potato as a result of osmosis
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Hence, water gathers in the hollowed
portions of the potato cup
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No water
gathers in the hollowed portions of potato A
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It is a control set-up in the experiment
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Boiling denatures the proteins present in the cell membrane and
thus, disrupts the cell membrane
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Therefore,
osmosis will not occur
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Title: Fundamental Unit of life - Cell
Description: exercises and question with answers
Description: exercises and question with answers