Please select a subject first
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Which of the following contains maximum number of molecules?
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Rutherford’s α–particle scattering experiment showed that
- electrons have negative charge
- the mass and positive charge of the atom is concentrated in the nucleus
- neutron exists in the nucleus
- most of the space in atom is empty Which of the above statements are correct?
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In the Gold foil experiment of Geiger and Marsden, that paved the way for Rutherford’s model of an atom, ~ 1.00% of the α-particles were found to deflect at angles > 50º. If one mole of α-particles were bombarded on the gold foil, compute the number of α-particles that would deflect at angles less than 500.
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Intestine absorb the digested food materials. What type of epithelial cells are responsible for that?
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Which is not a function of epidermis?
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The dead element present in the phloem is
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A long tree has several branches. The tissue that helps in the side ways conduction of water in the branches is
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If a potted plant is covered with a glass jar, water vapours appear on the wall of glass jar. Explain why?
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Write true (T) or false (F)
The lining of blood vessels, lung alveoli and kidney tubules are all made up of epithelial tissue.
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Write true (T) or false (F)
Epithelial cells have a lot of intercellular spaces.
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Write true (T) or false (F)
Epithelial layer is permeable layer.
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Write true (T) or false (F)
Epithelial layer does not allow regulation of materials between body and external environment.
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Differentiate between sclerenchyma and parenchyma tissues. Draw well labelled diagram.
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Describe the structure and function of different types of epithelial tissues. Draw diagram of each type of epithelial tissue.
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Give reasons for
Meristematic cells have a prominent nucleus and dense cytoplasm but they lack vacuole.
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Give reasons for
Intercellular spaces are absent in sclerenchymatous tissues.
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Which one is a true fish?
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Differentiation in segmental fashion occurs in
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