Gaseous Exchange With Answers

Gaseous Exchange

Sr. # Questions Answers Choice
1 What is the primary function of the human kidneys? Pumping blood throughout the body Filtering waste products from the blood and producing urine Producing digestive enzymes for the small intestine Regulating body temperature through sweating
2 Which gas is a waste product of cellular respiration and is expelled from the human body during exhalation? Oxygen Nitrogen Carbon dioxide Methane
3 During inhalation, what happens to the intercostal muscles and the diaphragm? Intercostal muscles relax, diaphragm contracts Intercostal muscles contract, diaphragm relaxes Both intercostal muscles and diaphragm contract Both intercostal muscles and diaphragm relax
4 What substance in red blood cells is primarily responsible for transporting oxygen in the blood? Plasma Hemoglobin Platelets White blood cells
5 What is the primary function of the diaphragm in human respiration? To filter incoming air To warm and moisten air To contract and relax, changing lung volume To prevent food from entering the windpipe
6 Which part of the human respiratory system is responsible for the actual exchange of gases (oxygen and carbon dioxide)? Trachea Bronchi Alveoli Larynx
7 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
8 The opening and closing of stomata are regulated by the turgidity of which specialized cells? Epidermal cells Mesophyll cells Guard cells Companion cells
9 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
10 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
11 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
12 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.
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