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Animal Diversity
Nematodes are commonly known as roundworms. They are free-living, very tiny organisms. They have an elongated and tubular body. These organisms have a nervous system and are mostly act as parasites to both animals and plants.
Platyhelminthes
Platyhelminthes are also known as "flatworms" because as they are dorsoventrally flattened from head to tail. They are invertebrate, soft-bodied, acoelomate, unsegmented and have bilateral symmetry.
What is the population density of corn in a hectare if the distance of planting is 75 cm x 33 cm with 2 plants per hill?
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- When the average mass of individual plants in a stand is plotted against stand density (log-transformed), the slope of the relationship is very often around Multiple Choice -1/2. -1. +1/2. -3/2. +3/2.Miss L is bored in the summer, so she wants to estimate the population of weeds on her property. The property measures 20 m x 20 m. She randomly places ten 1 m x 1 m quadrats on her property as shown in the diagram below. What is the estimated population size? Only write the numerical value.In the following Fz population, we have the following data for plant height (cm) of individual plants: 3, 14, 15, 15, 16, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 10
- Using the same experimental data, what is the percent increase in height of plants in the second generation? Round the mean height of each generation to the nearest tenth before you calculate the percent increase in height. Enter your answer to the nearest tenth (0.1).Miss l is bored in the summer, so she wants to estimate the population of weeds on her property. The property measures 20 m x 20 m. She randomly places ten 1 m x 1 m quadrats on her property as shown in the diagram below. What is the estimated population size?Using the same experimental data, what is the percent increase in height of plants in the second generation? Round the mean height of each generation to the nearest tenth before you calculate the percent increase in height. Enter your answer to the nearest tenth (0.1). Write answer as a percentage.
- The following graph depicts the relationship between the mean flower depth of Zaluzianskya microsiphon plants and the proboscis length of its long-tonged fly Disa nivea pollinator in a specific region. • Zaluzianskya microsiphon 60- O Disa nivea E 50- 물 40- 30- 20- 10- 10 20 30 40 50 Mean fly proboscis length (mm) Based on this correlation, do you think these two species are coevolving? Why or why not? And based on the geographic mosaic theory, would you consider the region were the plants and flies live a cold or a hot spot? Explain your answer. Mean flower depth (mm)The following graph depicts the relationship between the mean flower depth of Zaluzianskya microsiphon plants and the proboscis length of its long-tonged fly Disa nivea pollinator in a specific region. Zaluzianskya microsiphon O Disa nivea 60- 50 40- 30 20- 10 10 20 30 40 50 Mean fly proboscis length (mm) Based on this correlation, do you think these two species are coevolving? Why or why not? And based on the geographic mosaic theory, would you consider the region were the plants and flies live a cold or a hot spot? Explain your answer. Mean flower depth (mm)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.
- POLLEN ud INBRED PLANT FIRST YEAR DETASSELED DETASSELED BXA -SINGLE-CROSS SEED INBRED PLANT POLLEN FROM CXD DETASSELED ACXO SINGLE-CROSS SEED SECOND YEAR Fucke SINGLE-CROSS PLANT (BXA) INBRED PLANT C (B x A)x(CxD) DOUBLE-CROSS SEED FOR COMMERCIAL PLANTING a INBRED PLANT D SINGLE-CROSS PLANT (CXD) In the early 1900s, plant breeders showed that crossing individuals from two different favorable inbred varieties produced hybrid offspring often more vigorous and having more desirable traits than offspring produced from inbreeding. This phenomenon, known as heterosis, led to tremendous increases in corn production in the United States. In 1931, 0.1 percent of the corn planted was hybrid corn, resulting in an average yield of 24.5 bushels per acre. In 1992, almost all corn planted in the United States was hybrid corn, resulting in an average yield of 135 bushels per acre. Study the figure at the bottom of the page, which shows the current method for producing hybrid corn. Explain the…In constructing a mathematical model for population growth of tilapia grown in fishpens, which factor(s) may be included in model.Why is the growth curve for most populations S-shaped?