Which one of the following statements is incorrect?
- The residual air in lungs slightly decreases the efficiency of respiration in mammals
- The presence of non-respiratory air sacs, increases the efficiency of respiration in birds
- In insects, circulating body fluids serve to distribute oxygen to tissues
- The principle of countercurrent flow facilitates efficient respiration in gills of fishes
The Correct Option is A
Solution and Explanation
The presence of non-respiratory air sacs increases the efficiency of respiration in birds. In birds, respiratory air sacs are actually non-expanding and function as bellows to maintain a unidirectional flow of air through the lungs, but they do not directly participate in gas exchange.
So, the correct option is (A): The residual air in lungs slightly decreases the efficiency of respiration in mammals
Top Questions on Exchange Of Gases
Which of the following statements about the pharynx and larynx is/are correct?
(1) The pharynx serves as a pathway for both food and air.
(2) The larynx is involved in the production of sound.
(3) The pharynx contains the vocal cords.
(4) The larynx prevents food from entering the trachea.
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Statement II: Increase in the concentration of greenhouse gases is directly dependent upon anthropogenic activities.
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Questions Asked in NEET exam
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Statement I: Fig fruit is a non-vegetarian fruit as it has enclosed fig wasps in it.
Statement II: Fig wasp and fig tree exhibit a mutual relationship as the fig wasp completes its life cycle in the fig fruit and the fig fruit gets pollinated by the fig wasp. - A wire of resistance \(R\) is cut into 8 equal pieces. From these pieces, two equivalent resistances are made by adding four of these together in parallel. Then these two are added in series. The net effective resistance of the combination is:
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A sphere of radius R is cut from a larger solid sphere of radius 2R as shown in the figure. The ratio of the moment of inertia of the smaller sphere to that of the rest part of the sphere about the Y-axis is :
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Concepts Used:
DNA Replication
The process by which the genome’s DNA is copied in cells is called DNA Replication. It must first copy (or replicate) its entire genome before cell division so that each resulting daughter cell ends up with its own complete genome.
It is the natural cycle of creating two indistinguishable imitations of DNA from one unique DNA molecule. DNA replication happens to take all things together living creatures going about as the most core part for organic legacy. This is important for cell division during the development and fixation of harmed tissues, while it likewise guarantees that every one of the new cells gets its duplicate of the DNA. The phone has the unmistakable property of division, which makes replication of DNA fundamental.
The parental DNA stays together, and the recently shaped daughter strands are together in conservative replication. The semi-conservative strategy recommends that every one of the two parental DNA strands goes about as a format for new DNA to be integrated; after that each two-fold abandoned DNA incorporates one "old" strand (parental) and one "new" strand.