If the mean and the median pertaining to a certain character of a population are of the same value, which of the following is most likely to occur

  • a normal distribution

  • a bi-modal distribution

  • a T-shaped curve

  • a T-shaped curve


A.

a normal distribution

For a normal distribution the, mean, median and mode are actually equivalent.

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Praying mentis is a good example of

  • Mullerian mimicry

  • Warning colouration

  • Social insects

  • Social insects


C.

Social insects

Praying mantis (Mantis religiosa) is a large social insect. It has small triangular head, a long prothorax and abdomen consisting of 10 segments. The wings are well developed and the pincer-like forelegs are modified for grasping prey. It usually inhabits plantation areas. It destroys certain harmful insects so it is useful.

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How does pruning help in making the hedge dense?

  • It induces the differentiation of new shoots from the rootstock

  • It frees axillary buds from apical dominance

  • The apical shoot grows faster after pruning

  • The apical shoot grows faster after pruning


B.

It frees axillary buds from apical dominance

Pruning helps in making the hedge dense as it frees the axillary buds from apical dominance. In fact, the apicies of the plant axis (e.g. Shoot apex) has the highest concentration of auxin which suppresses the axillary buds while promotes the growth of apical bud. When the shoot apex is cut down through pruning, the axillary buds grow and the hedge becomes dense.

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A high density of elephant population in an area can result in

  • Mutualism

  • Intraspecific competition

  • Interspecific competition

  • Interspecific competition


B.

Intraspecific competition

Intraspecific competition is an important density dependent factor regulating populations. Intraspecific competition occur between the members of same population. 

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Niche overlap indicates

  • active cooperation between two species

  • two different parasites on the same host

  • sharing of one or more resources between the two species

  • sharing of one or more resources between the two species


B.

two different parasites on the same host

Niche overlap is a measure of the association of two or more species. This indicate their similar habitat requirement and may also indicate competition if trophic niche/spatial niche is same and food/space is limiting eg., two different parasites on the same host.

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