Fill in the blanks with suitable words.
1. ____ regulate the exchange of gases and the loss of water vapour from the leaves.
2. Who won the Nobel Prize for his work on photosynthesis?
3. ____are stacks of thylakoid membrane.
4. Photosynthesis occurs in which organelle of the cell?
5. Iodine can be used to test the presence of____.
Chapter: Life Processes (NCERT Book Activity 6.1)
Activity Steps
Step 1: Take a potted plant with variegated leaves – for example, a money plant or croton.
Step 2: Keep the plant in a dark room for three days so that all the starch gets used up.
Step 3: Now keep the plant in sunlight for about six hours.
Step 4: Pluck a leaf from the plant. Mark the green areas in it and trace them on a sheet of paper.
Step 5: Dip the leaf in boiling water for a few minutes.
Step 6: After this, immerse it in a beaker containing alcohol.
Step 7: Carefully place the above beaker in a water bath and heat till the alcohol begins to boil.
What happens to the colour of the leaf? What is the colour of the solution?
Step 8: Now dip the leaf in a dilute solution of iodine for a few minutes.
Take out the leaf and rinse off the iodine solution.
Observe the colour of the leaf and compare this with the tracing of the leaf done in the beginning.
What can you conclude about the presence of starch in various areas of the leaf?
In each of the following questions, a statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as.
(a) If assertion is true and reason is correct explanation of assertion.
(b) If assertion is true but reason is false.
(c) If assertion is false but reason is true.
(d) If both are false.
Q1:
Assertion: We detect the smell of agarbati (incense stick)
Reason: Smell is detected by phono receptors of nose, which further relay impulses to the brain.
1. Why does not a wall immediately acquire a white colour when a coating of slaked lime is applied on it ?
2. Define displacement reaction with one example.
3. Identify the most reactive and least reactive metal : Al, K, Ca, Au.
4. Which of the following is a combination reaction and which is a displacement reaction ?
(a) Cl₂ + 2KI ——–> 2KCl + I₂
(b) 2K + Cl₂ ——–> 2KCl.
5. What is the difference between the following two reactions ?
(a) Mg + 2HCl ——–> MgCl2 + H2
(b) NaOH + HCl ——–> NaCl + H2O.
6. Identify the compound which is oxidised in the following reaction
H₂S + Br₂ ———–> 2HBr + S.
7. What happens chemically when quick lime is added to water ?
1. Swedish botanist Carolus Linnaeus established binomial nomenclature.
2. Caper Bauhin expressed proposed binomial nomenclature for the first time
3. In binomial nomenclature, the first word is a generic name having first letter capital and second word is a specific epithet having first letter. e.g. Homo sapiens, Mangifera indica
4. After end of biological name, the name of author is written in abbreviated form who gave the name to that organism.
5. Both the words of a biological name when handwritten are separately underlined and when printed are typed in italics to indicate their Latin origin and also give respect to the name.
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| credits:wikipedia |
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| Human Alimentary Canal Image Credits: clker.com |
