Types of Nutrient Cycle

♤ Based on the replacement period a nutrient cycle is referred to as Perfect or Imperfect cycle.

♤ A perfect nutrient cycle is one in which nutrients are replaced as fast as they are utilised. Most gaseous cycles are generally considered as perfect cycles.

♤ In contrast sedimentary cycles are considered relatively imperfect, as some nutrients are lost from the cycle and get locked into sediments and so become unavailable for immediate cycling.

♤ Based on the nature of the reservoir, there are two types of cycles namely Gaseous and sedimentary cycle

♤ Gaseous Cycle - where the reservoir is the atmosphere or the hydrosphere, and

♤ Sedimentary Cycle - where the reservoir is the earth’s crust.

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Spiders can’t chew or swallow inject their prey with poison using their fangs. The poison turns the insides of insect to a watery goop and the spider just sucks it up.