1 Many times, offsprings resemble their parents in characters. Mention the cell structure responsible for such transfer of characters and also mention where do we find them in the cell?
2 One major difference between plant cell and animal cell is that plant cell has chloroplast. why chloroplasts are found only in plant cells?
3 The gas produced from burning sulfur was collected in a gas jar and its solution was prepared. The solution was tested with blue and red litmus papers. Then it turned blue litmus paper red. Give reason for the observation and mention the product that turned blue litmus to red.
4 Analyse the situation and give reason:
a) Phosphorus is stored in water
b) Magnesium reacted with acid and produced gas that burned with a ‘pop’ sound.
c) Aluminium foils are used to wrap food items.
5 Ram with his family went to a picnic spot near a pond. He saw some jelly-like mass floating on the sides of the pond. He asked about to his father. His father explained to him that these are frog eggs and are millions in number. Ram wondered if all of them get hatched, what will happen to other aquatic animals
a) What type of fertilization is shown by frogs?
b) Why do frogs lay eggs in large amounts?
c) Is Ram’s concern about hatching too many eggs at a time will affect the aquatic animals, correct?
give any 2 answers
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An electric battery is a source of electric power consisting of one or more electrochemical cells with external connections for powering electrical devices. When a battery is supplying electric power, its positive terminal is the cathode and its negative terminal is the anode. Wikipedia
Working principle: Electrochemical
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