31. In a population of salmon fish, potential Natality is 10,000 while realised mortality is 200, then the Vitlal Index =
32. Which of the following is not possible in ecosystem where microflora is absent
33. If marine fish is kept in fresh water, will it survive
A. Yes, If chlorine cells are placed in its kidney
B. Yes, If chlorine cells are placed in its green gland
C. No, Because it can not adapt
D. No, they can not survive but of yongones hatching out of their eggs can survive
Answer : Option C
34. What is true for both the organism showing interspecific compitition ?
A. Both are benefited
B. more or less harmful effect to both
C. one is benefited where as other is at loss
D. None of these
Answer : Option B
35. If at âtâ time population density is N, then what is the equation for the population density at (t+1) time ?
A. N (t+1) = Nt - [CD+E] - [B+I)]
B. N (t+1) = Nt+B+I-D-E
C. N (t+1) = Nt+(B+I)-(D+ E)]
D. All of these
Answer : Option D
36. Write appropriate option for antibiosis
A. Penicillium fungi and certan gram +ve bacteria
B. Penicillium fungi and certan gram -ve bacteria
C. Spirocheate and fermicutes
D. None of these
Answer : Option A
37. In which subdivision of aquatic ecosystem thermal stratification in seen ?
A. marine
B. deep fresh water habitat
C. marine and fresh water area
D. None of these
Answer : Option B
38. In which of the following aquatic ecosystems habitat fluid (liquid) is very concetrated compared to body fluid ?In which of the following aquatic ecosystems habitat fluid (liquid) is very concetrated compared to body fluid ?
39. Which of the following is true with reference to temperature diffrence ?
A. 1. Terrestrial Habital > Aquatic Habitat 2. Sea < Deep fresh water lakes
B. 1. Aquatic Habitat > Terrestrial Habitat 2. Sea < Deep fresh water lake
C. 1. Terrestrial Habital = Aquatic Habitat 2. Sea < Deep fresh water lake
D. 1. Terrestrial Habital = Aquatic Habitat 2. Sea < Deep fresh water lake
Answer : Option A
40. Water holding capacity of land depends on ?
A. Soil composition
B. Grain size
C. Aggregation of grain
D. All of these
Answer : Option D