Marine birds like Albatross spend their life on the sea. That means the water the, drink is salty. how do they manage osnioregulation then?
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Plants have no circulatory system? Then how cells manage intercellular transport?
1. Plant cells show presence of plasmodesmata which are cytoplasmic bridges between neighbouring cells. 2. This open channel through the cell wall connects the cytoplasm of adjacent plant cells and allows...
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Soft rock erodes beneath the hard rock due to sea waves. This results into landforms which further develop as sea arches.
Correct option is (a) Sea cave
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Two thin lenses have a combined power of +9D.When they are separated by a distance of 20 cm, then their equivalent power becomes `+27/5` D. Their indi
Correct Answer - C (c ) given, `P_(1)+P_(2)=9` We have, `P=P_(1)+P_(2)-dP_(1)P_(2)` `rArr 27/5=9-20/100xxP_(1)P_(2)` Again `(P_(2)-P_(1))^(2)=(P_(1)+P_(2))^(2)-4P_(1)P_(2)` `rArr P_(2)-P_(1)=3` On solving Eqs. (i) and (ii), we get `P_(1)=3and P_(2)=6`
2 Answers 1 views
Some cells do not have gap phase in their cell cycle whereas some cells spend maximum part of their life in gap phase.
1. G0 is the phase of the cell cycle in eukaryotes in which many cell types stop dividing. It is also called a quiescent stage. 2. If cells are deprived of...
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Assertion In one half-life of a radioactive substance more number of nuclei are decayed than in one average life. Reason Average life = Half -life/in
Correct Answer - D (d) Average life is more Hence more nuclei decay in one avaerage life .
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Sea divers go deep in the sea water with a mixture of which of the following gases
Correct Answer - A Deep sea divers use a mixture of `O_(2)` and He for breathing.
2 Answers 1 views
Discuss how development of oceanic tourism should be carried out without disturbing marine life.
It is difficult to clean up mass pollution once it has occurred, so the best plan is prevention. Several changes can take place to help keep industry in check and...
2 Answers 3 views
When a fresh-water protozoan possessing a contractile vacuole, is placed in a glass containing marine water, the vacuole will
Correct Answer - B Freshwater protozoans live in hypotonic solution so, for regulation fo excess of water which comes in the protoplasm through the process of endosmosis, contractile vaculoes have developed....
2 Answers 1 views
Coefficients of variation of two distributions are 50 and 60, and their arithmetic means are 30 and 25, respectively. Difference of their standard dev
Correct Answer - A Here, `(CV)_(1)=50,(CV)_(2)=60,overline(x_(1))=30 " and" overline(x_(2))=25` ` therefore (CV)_(1)=(sigma_(1))/(overline(x_(1)))xx100` `implies 50=(sigma_(1))/(30)xx100` `therefore sigma_(1)=(30xx50)/(100)=15` and `CV_(2)=(sigma_(2))/(overline(x_(2)))xx100` `implies 60=(sigma_(2))/(25)xx100` `therefore sigma_(2)=(60xx25)/(100)=15` Now, `sigma_(1)-sigma_(2)=15-15=0`
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People drink water when they are thirsty because water has the capacity to satisfy thirst.
Utility: The utility is a power of a commodity or service which satisfies human want. In this case, water has utility, as it satisfies the thirst of people.
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