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What are plankton, benthos and nekton?
Plankton, benthos and nekton are the three groups into which aquatic living beings may be divided.
The plankton is formed by algae and the small animals that float near the water surface carried by the stream. The nekton is composed of the animals that actively dive and swim in water, like fishes, whales, turtles, sharks, etc. The benthos comprises animals that ecologically linked to the bottom, including many benthonic fishes, echinoderms, crustaceans, molluscs, poriferans and annelids.
State the ways in which (a) all plant cells, (b) some plant cells vary from animal cells. (a) All plant cells have a cellulose cell wall. (b) Some plant c
- Oogenesis involves the formation of haploid cells from an original diploid cell, called a primary oocyte, through meiosis. - The female ovaries contain the primary oocyte. The
One of man's oldest methods of preserving foods is drying or desiccation. The preservation of foods by drying is a direct result of removal of moisture. Microorganisms need water
The chances of transmission in female is mor than males
FUNCTIONS (1 ) Intracellular digestion - Individual cells may obtain food through phagocytosis. The same is digested with the help of lysosomes. It is of two types:-
Which of the following statements is correct? A. Hemoglobin binds O2 more tightly at pH 7.2 than at pH 7.4. B. Fetal hemoglobin under physiological conditions binds O2 more t
Golgi complex is the organelles in animal cells having a sequence of þattened sacs which sort, chemically modify, and package proteins produced on the rough endoplasmic reticulum.
Summer Stratification - Thermal stratification Thermal stratification is fairly pronounced during the summer seasons in most lakes of the temperate (cold) regions but is rare
Use of micro-organisms to control insect pests, pathogens or weeds constitutes biological control, and the biological agents employed are called biocontrol agents. Micro-organis
How the blood is circulated with the help of Heart?
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