Quiz

Life Processes in Plants — Quiz

15 questions 15 min Apply concepts

Q1. In Activity 10.1, Table 10.1 asks students to record the height of the plant, the number of leaves and the colour of leaves on Day 1 and after how many weeks?
- A. After one week
- B. After two weeks
- C. After four weeks
- D. After six months
Q2. Why does the plant in Pot C (kept in the dark with water) show poor growth compared to Pot A in Activity 10.1?
- A. Because it gets no water
- B. Because it gets too much water
- C. Because it gets no sunlight
- D. Because the soil is different
Q3. In the iodine test for starch (Activity 10.2), the leaf is dipped in alcohol before adding iodine. The main purpose of using alcohol is to
- A. Kill any insects on the leaf
- B. Increase the size of the leaf
- C. Add starch to the leaf
- D. Remove the green colour so colour change can be seen clearly
Q4. In Activity 10.2, before dipping the leaf in alcohol, what is the first step performed on the leaf?
- A. It is kept in boiling water for five minutes to soften it
- B. It is dried in sunlight for one hour
- C. It is crushed with a pestle
- D. It is dipped in lime water
Q5. In Activity 10.3, Bhaskar tests a leaf with green and non-green patches taken from a plant kept in sunlight. After the iodine test, which patches turn blue-black?
- A. Only the non-green patches
- B. Only the green patches
- C. Both green and non-green patches
- D. Neither green nor non-green patches
Q6. The non-green patches of a leaf kept in sunlight do not turn blue-black with iodine. The most likely reason is
- A. Iodine reacts only with carbon dioxide
- B. Non-green patches receive no sunlight
- C. Non-green patches may not have enough chlorophyll to produce enough starch
- D. Non-green patches absorb iodine completely
Q7. In Activity 10.4, caustic soda (sodium hydroxide) is placed inside the bottle that holds half of the destarched leaf. The role of caustic soda is to
- A. Absorb the water in the bottle
- B. Add chlorophyll to the leaf
- C. Provide carbon dioxide to the leaf
- D. Absorb the carbon dioxide present in the air inside the bottle
Q8. After Activity 10.4 is kept in sunlight, the part of the leaf inside the bottle does NOT turn blue-black with iodine, while the part outside the bottle does. This shows that
- A. Carbon dioxide is essential for the synthesis of starch
- B. Water is essential for the synthesis of starch
- C. Sunlight is not needed for starch synthesis
- D. Caustic soda is needed for starch synthesis
Q9. The word equation of photosynthesis given in the chapter is
- A. Glucose + Oxygen gives Carbon dioxide + Water + Energy
- B. Carbon dioxide + Water gives Glucose + Oxygen
- C. Oxygen + Water gives Glucose + Carbon dioxide
- D. Starch + Sunlight gives Glucose + Oxygen
Q10. Food is actually produced during photosynthesis in the form of
- A. Starch, which is later converted to glucose
- B. Oxygen, which is later converted to water
- C. Glucose, which is later converted to starch for storage
- D. Protein, which is later converted to carbohydrate
Q11. In Activity 10.5, Barkha didi places her thumb on the inverted test tube and inserts a lit matchstick into it. The matchstick produces an intense flame. This shows that the gas collected is
- A. Carbon dioxide
- B. Hydrogen
- C. Nitrogen
- D. Oxygen
Q12. In Activity 10.7, Priya places identical balsam plants in tumblers A (plain water) and B (water with red ink). After one day, what is most likely observed?
- A. Red colour appears in the stem, leaves and flowers of plant B
- B. Red colour appears only in the roots of plant A
- C. Red colour appears in both plants equally
- D. No colour change appears in either plant
Q13. In Activity 10.8, the lime water in the test tube connected to the flask containing germinating moong seeds turns milky. This indicates that the seeds have released
- A. Oxygen
- B. Carbon dioxide
- C. Water vapour
- D. Glucose
Q14. The word equation for respiration in plants, as given in the chapter, is
- A. Carbon dioxide + Water gives Glucose + Oxygen
- B. Glucose + Water gives Carbon dioxide + Oxygen + Energy
- C. Glucose + Oxygen gives Carbon dioxide + Water + Energy
- D. Oxygen + Carbon dioxide gives Glucose + Water
Q15. In Question 5 of 'Let Us Enhance Our Learning', X + Y gives Carbon dioxide + Z + Energy. The three components X, Y and Z stand for
- A. X — Carbon dioxide; Y — Water; Z — Glucose
- B. X — Oxygen; Y — Water; Z — Glucose
- C. X — Water; Y — Glucose; Z — Oxygen
- D. X — Glucose; Y — Oxygen; Z — Water

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