Gaseous Exchange With Answers

Gaseous Exchange

Sr. # Questions Answers Choice
1 Submerged aquatic plants perform gaseous exchange primarily through which of the following? Well-developed stomata on their leaves. Lenticels located on their stems. Their entire general body surface. Specialized air roots (pneumatophores).
2 During intense daylight, what is the predominant net gaseous exchange occurring in the leaves of a photosynthesizing plant? Intake of oxygen and release of carbon dioxide. Intake of carbon dioxide and release of oxygen. Equal intake and release of both oxygen and carbon dioxide. No net exchange of gases occurs.
3 Which statement accurately describes lenticels? They are found primarily on the upper epidermis of leaves. They are regulated by guard cells to control gas exchange. They are permanent pores in the bark of woody stems and roots. They are involved in the absorption of water from the soil.
4 What primary factor directly regulates the opening and closing of stomata in plant leaves? Root pressure Turgor pressure in guard cells Xylem sap flow Phloem transport
5 Within the internal structure of a plant leaf, what is the main function of the numerous interconnected intercellular air spaces surrounding the mesophyll cells? To store excess water for drought conditions To facilitate the transport of sugars to other parts of the plant To allow for efficient diffusion of gases like CO2 and O2 throughout the leaf To provide structural support and rigidity to the leaf tissue
6 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
7 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.
8 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
9 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
10 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.
11 Which gas is continuously required by plants for the process of cellular respiration, day and night? Carbon dioxide Nitrogen Oxygen Methane
12 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.
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