Concept explainers
Which of the following is NOT found in topsoil?
a. Humus
b. Bedrock
c. Bacteria
d. Air

Introduction:
The soil is an important part of the Earth. The soil layer of the Earth is called the pedosphere, which plays a vital role in Earth’s atmosphere. It provides medium for plant growth, water storage, and provides space for organisms to live. The soil composed of 50% solids that has minerals and organic matter, and other 50% pores are filled with water and gas.
Answer to Problem 1U
Correct answer:
The soil consists of humus, microorganisms including bacteria, and the pore space between the soil particles have air, however, the topsoil lack bedrock. Therefore, option b. is correct.
Explanation of Solution
Reason for the correct statement:
The soil is formed by the weathering of rocks and is the outermost layer of the crust of the Earth. It is comprised of rocks, sand, silt, clay, humus, and other organic matter. There are different layers of soil. The topsoil is the topmost layer of the soil. The topsoil is comprised of mineral particles, microorganisms, humus, sand, clay, silt, air, and water.
Option b. is given as "bedrock".
As “the bedrock is the innermost layer of the soil and is NOT found in the topsoil”, it is the right answer.
Hence, option b. is correct.
Reasons for the incorrect statements:
Option a. is given as “humus”.
The humus can be defined as the partially digested and decomposed organic matter. It is found in the topsoil. Therefore, it is a wrong answer.
Option c. is given as “bacteria”.
The topsoil consists of living organisms including bacteria, fungi, and other microorganisms. Therefore, it is a wrong answer.
Option d. is given as “air”.
The air in the topsoil is present in the pore space present between the particles of the soil. Therefore, it is a wrong answer.
Hence, options a., c., and d. are incorrect.
Conclusion:
The soil is formed by the weathering of rocks. It has several layers, the topmost of it is known as the topsoil. The topsoil is comprised of sand, silt, clay, air, humus, microorganisms and roots of the plants.
Want to see more full solutions like this?
Chapter 38 Solutions
BIOLOGY VOL. II
- An 1100 pound equine patient was given 20 mg/kg sucralfate 3 times a day, 2.8 mg/kg famotidine twice a day, and 10mg/kg doxycycline twice a day. Sucralfate comes as a 1 gm tablet, famotidine as 20 mg tablets, and doxycycline as 100mg tablets. All are in bottles of 100 tablets.How many total mg are needed for the patient and how many tablets of each would be needed to provide each dose?How many bottles of each would be needed to have available if this patient were to be on this drug regimen for 5 days?arrow_forwardThe patient needs a solution of 2.5% dextrose in Lactated Ringer’s solution to run at 75 ml/hr for at least the next 12hours. LRS comes in fluid bags of 500 ml, 1 Liter, 3 Liters and 5 Liters. How can a 2.5% solution be made by adding50% dextrose to the LRS?arrow_forward“Gretchen” was a 68-pound canine who came to the VMTH as small animal surgery patient. She receivedacepromazine, 0.2 mg/kg from a 10 mg/ml solution and oxymorphone, 0.08 mg/kg from a 1 mg/ml solution before surgery.What are the mechanisms of action of acepromazine and oxymorphone? Why would they be given together?How many mg provide each dose and how many ml of each of these solutions were given?arrow_forward
- After surgery, “Gretchen” was put on carprofen, 1 mg/pound bid (twice a day). The tablets come in 25, 75 and 100 mgsizes. Which size tablet would be appropriate?What is the mechanism of action of carprofen?An outpatient prescription was written for her so she would have enough for 10 days. How many tablets did she need?What information needs to be on her out-patient prescription?arrow_forwardJoden Koepp olor in chickens is due to incomplete dominance. BB = Black chicken, WW = White BLOOD TYPES Arhite chicken is In humans, Rh positive blood is dominant (R) over Rh negative blood (r). A man with type 0, Rh positive blood (whose mother had Rh negative blood), marries a woman with type AB, Rh negative blood. Several children were born. is? R R Genotypes Phenotypes RRR RR Rr Rr 4/16 RR R RR RK Rr Rr 4/16 rr 3/4 Rh posi 1/4 Rh negu 1/2 Rr rr rr rrrr 88 888 75 e genotype of the man? the genotype of the woman? The mother of the man had type AB blood.arrow_forwardPlease indentify the unknown organismarrow_forward
- 5G JA ATTC 3 3 CTIA A1G5 5 GAAT I I3 3 CTIA AA5 Fig. 5-3: The Eco restriction site (left) would be cleaved at the locations indicated by the arrows. However, a SNP in the position shown in gray (right) would prevent cleavage at this site by EcoRI One of the SNPs in B. rapa is found within the Park14 locus and can be detected by RFLP analysis. The CT polymorphism is found in the intron of the Bra013780 gene found on Chromosome 1. The Park14 allele with the "C" in the SNP has two EcoRI sites and thus is cleaved twice by EcoRI If there is a "T" in that SNP, one of the EcoRI sites is altered, so the Park14 allele with the T in the SNP has only one EcoRI site (Fig. 5-3). Park14 allele with SNP(C) Park14 allele with SNPT) 839 EcoRI 1101 EcoRI 839 EcoRI Fig. 5.4: Schematic restriction maps of the two different Park14 alleles (1316 bp long) of B. rapa. Where on these maps is the CT SNP located? 90 The primers used to amplify the DNA at the Park14 locus (see Fig. 5 and Table 3 of Slankster et…arrow_forwardFrom your previous experiment, you found that this enhancer activates stripe 2 of eve expression. When you sequence this enhancer you find several binding sites for the gap gene, Giant. To test how Giant interacts with eve, you decide to remove all of the Giant binding sites from the eve enhancer. What results do you expect to see with respect to eve expression?arrow_forwardWhat experiment could you do to see if the maternal gene, bicoid, is sufficient to form anterior fates?arrow_forward
- Biology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage Learning
- Biology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStaxBasic Clinical Lab Competencies for Respiratory C...NursingISBN:9781285244662Author:WhitePublisher:CengageBiology: The Unity and Diversity of Life (MindTap...BiologyISBN:9781337408332Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa StarrPublisher:Cengage Learning



