Gaseous Exchange With Answers

Gaseous Exchange

Sr. # Questions Answers Choice
1 Which part of the human respiratory system is responsible for the actual exchange of gases (oxygen and carbon dioxide)? Trachea Bronchi Alveoli Larynx
2 Which of the following adaptations maximizes the efficiency of gaseous exchange in plant leaves? Thick cuticle layer Compactly arranged mesophyll cells Large surface area provided by numerous stomata Reduced intercellular air spaces
3 The opening and closing of stomata are regulated by the turgidity of which specialized cells? Epidermal cells Mesophyll cells Guard cells Companion cells
4 During nighttime, what is the net gaseous exchange observed in most plants? Intake of CO2 and release of O2 Release of CO2 and intake of O2 Release of both CO2 and O2 No significant gaseous exchange occurs
5 Once inside the leaf, where do gases like CO2 and O2 primarily dissolve before diffusing into individual cells? In the cell wall material In the water film lining the intercellular spaces Directly into the cytoplasm In the chloroplast stroma
6 How do gases primarily move from the atmosphere to the internal cells of a plant leaf? Through xylem vessels By diffusion through stomata Via phloem tubes Active transport across the cuticle
7 The air spaces present in the spongy mesophyll of a leaf are crucial for which process? Absorbing sunlight for photosynthesis. Storing excess water for drought conditions. Facilitating the diffusion of gases throughout the leaf. Providing mechanical support to the leaf structure.
8 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).
9 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.
10 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.
11 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
12 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
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