{"id":3739,"date":"2024-09-11T11:13:52","date_gmt":"2024-09-11T05:43:52","guid":{"rendered":"https:\/\/study.madeeasy.in\/?p=3739"},"modified":"2025-08-11T16:23:02","modified_gmt":"2025-08-11T10:53:02","slug":"biological-zones-in-lakes","status":"publish","type":"post","link":"https:\/\/www.madeeasy.in\/study\/ce\/biological-zones-in-lakes","title":{"rendered":"Biological Zones in Lakes"},"content":{"rendered":"

Lakes have been found to exhibit distinct zone of biological activity, largely determined by the availability of light and oxygen. the most important biological zones are:<\/p>\n

Biological Zones are:<\/h2>\n

(i) Euphotic zone
\n(ii) Littoral zone
\n(iii) Benthic zone<\/p>\n

(i) Euphotic zone:<\/strong><\/p>\n

The upper layer of lake water<\/a> through which sunlight can penetrate, is called the euphotic zone. All plant growth occurs in this zone. The depth of the euphotic zone is reduced by the turbidity which block sunlight penetration. The depth of the euphotic zone can be measured by a device called the Secchi disk.<\/p>\n

(ii) Littoral Zone:<\/strong><\/p>\n

The shallow water near the shore, in which rooted plants grow, is called the littoral zone. The extent of the littoral zone depends on the slope of the lake bottom and the depth of the euphotic zone. The littoral zone cannot extend deeper than the euphotic zone.<\/p>\n

(iii) Benthic zone:<\/strong><\/p>\n

The bottom sediments in a lake comprises the benthic zone. Living organisms, when they die, settle down to the bottom, where they are decomposed by bacteria present in the benthic zone.\"Biological<\/p>\n

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