Answered: Explain why knowledge of the effects in…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Intraspecific competition is a competition between members of the same species and is commonly observed in crop plants. Table 6.2 shows the results of a greenhouse experiment which examined the effects of density on the germination and growth of barley. Plants were grown for two weeks in 10- cm diameter pots kept in identical environmental conditions and watered regularly. At the end of the experiment the plants were cropped by cutting the stems at the soil surface.

Explain why knowledge of the effects in density is important to the crop farmer.

Table 6.2 Effect of seed density on germination rate, biomass and stem length in barley
Number of plants
that germinated
Mean stem length
(cm)
Number of seeds
Germination rate
Total wet biomass
Mean wet biomass
sown per pot
(%)
of plants (g)
of plants (g)
50
43
86
17.0
0.395
25.6
100
88
21.4
19.2
200
168
27.7
14.3
400
332
40.9
13.6

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