Gaseous Exchange With Answers

Gaseous Exchange

Sr. # Questions Answers Choice
1 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.
2 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.
3 The opening and closing of stomata are regulated by specialized cells known as: Epidermal cells. Mesophyll cells. Guard cells. Xylem cells.
4 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.
5 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.
6 Which of the following conditions generally causes stomata to open in most plants during the day? Low light intensity. High internal CO2 concentration. High turgor pressure in guard cells. Dry atmospheric conditions.
7 In leaves, what is the primary function of the air spaces between spongy mesophyll cells regarding gaseous exchange? To store excess water. To facilitate the diffusion of gases throughout the leaf. To produce chlorophyll for photosynthesis. To provide structural support to the leaf.
8 The movement of gases like oxygen and carbon dioxide across the cell membranes in plants primarily occurs by the process of: Active transport Osmosis Diffusion Facilitated diffusion
9 Which gas is released by plants during cellular respiration, both day and night? Oxygen Carbon dioxide Methane Hydrogen
10 During the daytime, plants primarily take in which gas from the atmosphere for photosynthesis? Oxygen Nitrogen Carbon dioxide Water vapor
11 In old woody stems and roots, gaseous exchange occurs through specialized pores called: Stomata Lenticels Root hairs Epidermis
12 Which structures are primarily responsible for gaseous exchange in the leaves of most plants? Xylem Phloem Stomata Cuticle
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