Gaseous Exchange With Answers

Gaseous Exchange

Sr. # Questions Answers Choice
1 Which waxy layer on the surface of plant leaves acts as a primary barrier to uncontrolled gaseous exchange and water loss, but also limits direct gas diffusion? Epidermis Cuticle Cell wall Stomata
2 During nighttime, when there is no light available for photosynthesis, what is the predominant net gaseous exchange pattern observed in most plants? Plants primarily take in carbon dioxide and release oxygen. Plants primarily take in oxygen and release carbon dioxide. Plants take in both oxygen and carbon dioxide in equal amounts. There is no significant gaseous exchange occurring at night.
3 The opening and closing of stomata, which regulate the rate of gaseous exchange in leaves, are directly controlled by changes in the turgor pressure within which specialized cells? Epidermal cells Mesophyll cells Guard cells Palisade cells
4 How do submerged aquatic plants primarily exchange gases with their surrounding water environment? Through specialized stomata on their leaves Via lenticels present on their stems Across their general body surface and cell membranes By means of root hairs absorbing dissolved gases
5 In young stems and leaves, the epidermal cells are covered with a waxy layer called the cuticle. What is its primary function concerning gaseous exchange? To absorb gases more efficiently. To prevent excessive water loss, thereby limiting non-stomatal gas exchange. To increase the surface area for gas exchange. To facilitate the entry of carbon dioxide.
6 Which gas is continuously required by plants for the process of cellular respiration, day and night? Carbon dioxide Nitrogen Oxygen Methane
7 The primary role of guard cells in plant leaves is to: Carry out photosynthesis. Absorb water from the atmosphere. Regulate the opening and closing of stomata. Provide structural support to the leaf.
8 How do submerged aquatic plants primarily exchange gases with their environment? Through specialized stomata on their leaves. Via lenticels present on their stems. Across their entire general body surface. Only through their root hairs.
9 What happens to the stomata in most plants during the night? They open wider to release excess oxygen. They remain unchanged, irrespective of light. They close to conserve water and prevent gas loss. They partially open to allow minimal gas exchange.
10 The opening and closing of stomata are regulated by specialized cells known as: Epidermal cells. Mesophyll cells. Guard cells. Xylem cells.
11 At night, when photosynthesis is not occurring, what is the net gaseous exchange between a plant and its environment? Plants take in CO2 and release O2. Plants take in O2 and release CO2. Plants take in both CO2 and O2. There is no gaseous exchange.
12 How do root hair cells primarily obtain oxygen for respiration from the soil? Through direct absorption from atmospheric air. By diffusing from air spaces present in the soil. By actively transporting oxygen from water. By producing their own oxygen through photosynthesis.
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