Question

Soil classified as sand is ________% sand.

		at least 70
		at least 85
		100
		at least 43
		at least 10

Soil that is 30% silt could be classified as any of the following EXCEPT ________.

		sandy loam
		loam
		clay
		clay loam
		silt loam
Ticks serve what role in this food web? secondary consumers autotrophs top predators parasites primary consumers Which of the following is/are depicted as primary consumers in the figure? deer mice and eastern chipmunks earthworms red-bellied woodpeckers ticks American toads and rat snakes Which of the following organisms in the figure is a producer? caterpillar shelf fungus white-tailed deer blackberry American toad Which of the following organisms in the figure is depicted as being at the highest trophic level? eastern chipmunk deer mouse rat snake white oak white-tailed deer Which of the following soils would be classified as clay loam? 70% clay, 10% silt, and 20% sand 60% clay and 40% silt 60% clay, 70% sand, and 30% silt 70% silt and 30% sand 30% clay, 40% sand, and 30% silt

In 1906, President Theodore Roosevelt created the Grand Canyon National Game Preserve on the Kaibab Plateau in northern Arizona. Between 1907 and 1923, cattle grazing was greatly reduced, mule deer hunting was eliminated, and predators were killed. Over 800 cougars, 20 wolves (most had already been killed in the 1800s), and 7000 coyotes were trapped or shot. In response, the mule deer herd began to increase: By 1915, deer numbers were estimated at 25,000; 50,000 by 1920; and 100,000 by 1923.


Which of the following is likely to be a direct or indirect effect of removing top predators from an ecosystem?

		a decrease in the carrying capacity of their prey
		a decrease in the populations of their prey
		a decrease in ground-level vegetation such as tree saplings
		conversion of grassland into the forest
		greater competition among the remaining top predators in the ecosystem

Answer 1

1) Soil that can be classified as sand is if it contains atleast 85% of sand particles.

2) Silty loam consist of 74-88% of silt, whereas in other such as sandy loam, silt can range from 0-50% ; loam can have 28-50% silt; clay can have 0-40% silt; and clay loam can have 15-52% silt. So only Silt loam can't have 30% silt, because it constitutes of minimum 74% silt.

Note- For more detailed information you can check the classification of USDA textural classes of soil.

3) Autotrophs are the producers like plants, on which the primary consumers depends, and then the secondary consumers depends upon the primary consumers, and then the tertiary consumers depends upon the secondary consumers, and finally there is apex or top predator at the top of food web. This is how the food web works.

Thus, they include Autotrophs, primary consumers, secondary consumers, top predarors.

4) Earthworms , deer , mice, eastern chimpunk and rat are primary consumers. Snake depends on primary consumers which makes them secondary consumers, whereas red bellied woodpecker are omnivorous.