Gaseous Exchange With Answers

Gaseous Exchange

Sr. # Questions Answers Choice
1 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.
2 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.
3 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
4 Which gas is released by plants during cellular respiration, both day and night? Oxygen Carbon dioxide Methane Hydrogen
5 During the daytime, plants primarily take in which gas from the atmosphere for photosynthesis? Oxygen Nitrogen Carbon dioxide Water vapor
6 In old woody stems and roots, gaseous exchange occurs through specialized pores called: Stomata Lenticels Root hairs Epidermis
7 Which structures are primarily responsible for gaseous exchange in the leaves of most plants? Xylem Phloem Stomata Cuticle
8 The respiratory centre is present in : Lungs Brain Nose Muscles
9 What percentage of oxygen inhaled form air during breathing? 21% 22% 23% 24%
10 Rate of breathing depends upon concentration of which gas: Oxygen Carbon dioxide Nitrogen Hydrogen
11 The percentage of oxygen from air which we inspired is: 15 % 21% 25% 28%
12 In normal condition human respiration rate is: 12 to 15 per minute 15 to 12 per minute 10 to 12 per minute 16 to 20 per minute
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