Conservation of biodiversity is important for :
(a) Animals (c) Plants
(b) Animals and plants (d) All organisms
You are provided with four test tubes containing sugar solution,
baking soda solution, tamarind solution, salt solution. Write
down an activity to find the nature (acidic/basic/neutral) of
each solution.
A farmer was unhappy because of his low crop yield. He
discussed the problem with an agricultural scientist and
realised that the soil of his field was either too acidic or too
basic. What remedy would you suggest the farmer to neutralise
the soil?
Boojho, Paheli and their friend Golu were provided with a test
tube each containing China rose solution which was pink in
colour. Boojho added two drops of solution ‘A’ in his test tube
and got dark pink colour. Paheli added 2 drops of solution ‘B’
to her test tube and got green colour. Golu added 2 drops of
solution ‘C’ but could not get any change in colour. Suggest
the possible cause for the variation in their results.
Fill the blanks in the following sentences
(a) Lemon juice and vinegar taste ___________ because they
contain ___________.
(b) Turmeric and litmus are _________ acid-base indicators.
(c) Phenolphthalein gives _________ colour with lime water.
(d) When an acidic solution is mixed with a basic solution,
they _________ each other forming _________ and water.
Form a sentence using the following words – baking soda, ant
bite, moist, effect, neutralised, rubbing.
While playing in a park, a child was stung by a wasp. Some
elders suggested applying paste of baking soda and others
lemon juice as remedy. Which remedy do you think is
appropriate and why?
Paheli is suffering from indigestion due to acidity. Is it
advisable to give her orange juice in this situation and why?
State whether the following statements are true or false.
Correct the false statements.
(a) All substances are either acidic or basic.
(b) A compound if acidic will turn all indicators red.
(c) Lime water turns red litmus blue.
(d) Common salt dissolved in water turns blue litmus red.
(e) Phenolphthalein is a natural indicator.
(f) Calamine can be used to treat ant’s sting.
(g) Lemon water is basic in nature.
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