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A tissueis a groupof similar cells specialisedto perform a specific function. The cells that make up a tissue aresimilar in structure, function and origin. For example- epithelial tissue, nervous tissue, muscular tissue, etc.

Answer: Option B. -> False
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B
Vacuoles are membrane-bound organelles present in both plant and animal cells. In plants, usually a single, large and permanent vacuole is present. It typically occupies 30% to 80% of plant cell volume. It is surrounded by a membrane called tonoplast and is filled with cell sap. Vacuoles may or may not be present in animal cells. If present, they are small and numerous.

Answer: Option B. -> Anton van Leeuwenhoek
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B
The microscope was discovered by a Dutch scientist Anton van Leeuwenhoek. He was the first person to observe living cells under the microscope. Hence, he is considered as the 'Father of Microbiology'.

Answer: Option D. -> cytoplasm
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D
The jelly-like fluid present between the cell membrane and the nuclear membrane is called the cytoplasm. It houses all the cellular organelles and is the site for most of the metabolic activities taking place in the cell.

Answer: Option B. -> False
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B
Cells show great diversity in their shapes and sizes. The size and shape of a cell are related to its function. Some multicellu­lar organisms may have smaller sized cells as compared to many unicellular organisms. Some single cells like the eggs of birds and reptiles are quite large. A nerve cell may attain a length of several meters while red blood cells are only 5-8µm in diameter. Also, within an organism, the cells rarely remain in the spherical form. They are either flat­tened (epithelial cells), spindle-shaped (muscle cells), spider-shaped (nerve cell), etc.

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Photosynthesisis a processby which green plantsconvert light energy into chemical energy. Simple raw materials such as water and carbon dioxideare converted to glucose in the presence of light. Life supportive oxygen is given out as a byproduct in this process.

Answer: Option C. -> Staining
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C
Cell staining is the technique of colouring different cellular organelles. It is used to visualisecellsandcellular components better under a microscope. By using differentstains, one can preferentiallystainspecific cellcomponents, such as a nucleus, cellwall, or the entirecell.

Answer: Option D. -> Microscope
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D
Amicroscopeis an optical instrumentused to observe objects that are invisible to the naked eye. It is used to view and study cell structure. The science of viewing small objects using a microscope is called microscopy.

Answer: Option A. -> True
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A
Guard cellsarecellssurrounding each stoma. They help regulate theopening and closing of the stoma. When the guard cells are turgidor swollen,the stomatal opening is large andwhenthe guard cells have lost water or flaccid,the stomatal openingcloses.

Answer: Option B. -> False
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B
Cell walls are present in plants, bacteria, and fungi. Animal cells do not have a cell wall, they are bounded by thecell membrane alone.The cell wall is more rigid than the cell membrane and provides structural and mechanical support to cells. Cell walls also protect cells from the entry of pathogens.