50295 + Interview Questions in Secondary School in Biology

1.	How many bacterial cells will remain after an antimicrobial treatment of 3 minutes, an initial microbial load of 106 cells, and a DRT of 1 minute?
Answer» Answer: The land application of agricultural RESIDUES can have a direct impact on bacterial concentrations in groundwater, surface water and soil, where leachate from manure-amended fields reaching subsurface tile drains has been shown to have concentrations exceeding background levels (Abu-Ashour et al., 1994; Jamieson et al., 2002; Unc and Goss, 2004; Goss and Richards, 2008). The survival of enteric bacteria can be influenced by several FACTORS, including soil moisture, soil type, pH, temperature and nutrient availability (Abu-Ashour et al., 1994; Goss et al., 2001; Jamieson et al., 2002). The survival of enteric bacteria in manure-amended soils increases with high moisture content, where moisture retention is linked to soil particle size distribution and organic matter content (Jamieson et al., 2002). Abu-Ashour et al. (1994) explain that there is an increased survival of bacteria with increased organic matter content in soils. Furthermore, finer soils (e.g. clay and humic substances) increase water retention, which ultimately increases bacterial survival. Chandler and Craven (1980) found E. coli CELLS were able to survive dry loam soil conditions but proliferated once moisture was restored. Bacterial survival is also favoured by cooler temperatures and neutral pH, with pH of 6 to 7 being optimum (Abu-Ashour et al., 1994; Jamieson et al., 2002). Goss et al. (2001) reported that E. coli O157:H7 can survive for up to 100 days under cold soil temperatures (< 5°C). It should be noted that freezing and THAWING of soils reduces bacterial survival.

1.

How many bacterial cells will remain after an antimicrobial treatment of 3 minutes, an initial microbial load of 106 cells, and a DRT of 1 minute?

Answer»

Answer:

The land application of agricultural RESIDUES can have a direct impact on bacterial concentrations in groundwater, surface water and soil, where leachate from manure-amended fields reaching subsurface tile drains has been shown to have concentrations exceeding background levels (Abu-Ashour et al., 1994; Jamieson et al., 2002; Unc and Goss, 2004; Goss and Richards, 2008). The survival of enteric bacteria can be influenced by several FACTORS, including soil moisture, soil type, pH, temperature and nutrient availability (Abu-Ashour et al., 1994; Goss et al., 2001; Jamieson et al., 2002).

The survival of enteric bacteria in manure-amended soils increases with high moisture content, where moisture retention is linked to soil particle size distribution and organic matter content (Jamieson et al., 2002). Abu-Ashour et al. (1994) explain that there is an increased survival of bacteria with increased organic matter content in soils. Furthermore, finer soils (e.g. clay and humic substances) increase water retention, which ultimately increases bacterial survival. Chandler and Craven (1980) found E. coli CELLS were able to survive dry loam soil conditions but proliferated once moisture was restored. Bacterial survival is also favoured by cooler temperatures and neutral pH, with pH of 6 to 7 being optimum (Abu-Ashour et al., 1994; Jamieson et al., 2002). Goss et al. (2001) reported that E. coli O157:H7 can survive for up to 100 days under cold soil temperatures (< 5°C). It should be noted that freezing and THAWING of soils reduces bacterial survival.

4.	Nucleus is also called
Answer» NECLEUS is ALSO CALLED as NUCLEAR

5.	Meena a student of class 8 conducted an experimental study to observe the effect of deforestation. The student took soil from a forested region and a barren land with no trees. The student added soil from the forested region with trees in Pot 1 and soil from barren land in Pot 2. In both the pots, a hibiscus plant was grown. After 1month, the student observes that the plant in pot A shows growth while the plant in pot B shows minimal growth. What is the likely reason for this observation?a) Soil from barren land is less fertile.b) Soil from forested land is poor in nutrients.c) Soil from the barren land contains more manure.d) Soil from forested land contains stored food for better plant growth
Answer» MEENA a student of class 8 conducted an experimental study to observe the effect of deforestation. The student took soil from a forested REGION and a barren land with no trees. The student added soil from the forested region with trees in Pot 1 and soil from barren land in Pot 2. In both the POTS, a hibiscus plant was grown. After 1month, the student observes that the plant in pot A shows growth while the plant in pot B shows MINIMAL growth. What is the likely reason for this observation?

15.	Define Bicarpellary ovary
Answer» Bicarpellary, syncarpous OVARY with axile PLACENTATION is seen in Solanaceae. When the placenta is axial and the ovules are attached to it in a MULTILOCULAR ovary, such placentation is said to be axile. Examples of this type are CHINA rose, tomato, and lemon.

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QD To prepare .leaf peed to show stomata.temporary amount of07

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Name the following:3. The gas needed to getrid of lactic acid is

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