Question

1. Demonstration of osmosis through potato. Write the observations and explain the result in
detail. (Ques no. 9 of NCERT textbook, pg. 67)
2. Find out the number of chromosome present in 10 different adult organisms.
3. Describe the Contribution of various scientist involved in the discovery of the following cell
organelles.
a. Plastids b. Mitochondria

Answer 1

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Answer 2

1. Osmosis in Potato:

• First the potato should be peeled and then cut the middle of the potato and place it in sugar solution.
• Then mark the solution level and then place the potato in a beaker filled with a colored solution.
• Wait for some time then it can be noticed that the sugar solution will be colored and the level will be rises due to the osmosis.

2. Number of chromosomes:

• Man has 46 pairs of chromosomes, cattle has 60 pairs, chicken has 78 pairs, dog has 78 pairs, donkey has 62 pairs,frog has 26 pairs,fruit flies has 8 pairs, grasshopper has 24 pairs, kangaroo has 16 pairs and koala has 16 pairs.

3.  Contribution of various scientist:

• In 1883, Andreas Schimper was the first man to give the definition of the plastid.
• In 1890, the scientist Richard Altmann was gave the name to the organelle bioblasts.
• In 1898, Carl Benda gave the name mitochondria.