Science Practice Quiz 48

Q1.Which of the following is an example of a plant with variegated leaves mentioned in the context of photosynthesis experiments?

A. Rose plant B. Money plant C. Mango tree D. Sunflower

Q2.What are stomata?

A. Tiny pores present on the surface of the leaves B. Specialized cells found in plant roots C. Vascular tissues responsible for water transport D. Reproductive structures of flowering plants

Q3.What is the primary purpose of massive gaseous exchange through stomata in leaves?

A. To release excess water vapor B. For the purpose of photosynthesis C. To absorb atmospheric nitrogen D. To regulate leaf temperature

Q4.How do stomatal pores open?

A. When guard cells shrink due to water loss B. When guard cells swell as water flows into them C. When the plant is exposed to darkness D. When carbon dioxide levels are high outside the leaf

Q5.Why does a plant close its stomatal pores when it does not need carbon dioxide for photosynthesis?

A. To prevent the entry of harmful gases B. To conserve energy for other processes C. To prevent large amounts of water loss D. To signal the end of the photosynthetic cycle

Q6.Which cells are responsible for the opening and closing of the stomatal pore?

A. Epidermal cells B. Palisade cells C. Guard cells D. Xylem cells

Q7.In Activity 5.2, what is the specific role of potassium hydroxide?

A. To provide essential nutrients to the plant B. To absorb carbon dioxide from the air C. To increase the humidity around the plant D. To act as a catalyst for photosynthesis

Q8.In terrestrial plants, how is water used in photosynthesis primarily obtained?

A. Absorbed directly from the atmosphere by leaves B. Taken up from the soil by the roots C. Produced as a byproduct of respiration D. Transported from the stem to the leaves

Q9.Which of the following elements is an essential raw material taken up from the soil for the synthesis of proteins and other compounds in plants?

A. Phosphorus B. Iron C. Magnesium D. Nitrogen

Q10.Apart from leaves, gaseous exchange in plants also occurs across the surface of which other parts?

A. Flowers and fruits B. Stems and roots C. Seeds and pollen D. Bark and wood

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Science Practice Quiz 48