Q. 51. Secondary productivity of _______ represents the pace at which new organic matter is formed.
Autotrophs
Consumers
Green plants
Chemoautotrophs
Answer:
(B) Consumers
Explanation:
While primary productivity refers to the generation of organic matter by autotrophs (plants), secondary productivity is defined as the rate at which consumers (heterotrophs) convert the chemical energy of their food into their own new biomass.
Q. 52. At successive trophic levels, energy transfer efficiency is lower due to
Substantial energy loss in the form of heat
Inefficient food digestion
Inefficient food absorption
Inefficient food consumption
Answer:
(A) Substantial energy loss in the form of heat
Explanation:
According to the 10% rule in ecology, when energy is passed in an ecosystem from one trophic level to the next, only ten percent of the energy will be passed on. A massive 90% is lost, largely as metabolic heat during respiration.
Q. 53. Which of the following statements about the light saturation point is INCORRECT?
C4 plants have higher light saturation levels than C3 plants.
Shade leaves have a lower light saturation point than sun leaves.
C3 plants have higher light saturation levels than C4 plants.
Heliophytes are adapted to high light environments.
Answer:
(C) C3 plants have higher light saturation levels than C4 plants.
Explanation:
Option (C) is factually incorrect because C4 plants (like maize and sugarcane) are specifically adapted to hot, bright environments and thus have much higher light saturation points than C3 plants.
Q. 54. Vivipary is an adaptation of
Heliophytes
Halophytes
Hydrophytes
Sociophytes
Answer:
(B) Halophytes
Explanation:
Vivipary (seeds germinating while still attached to the parent plant) is a vital biological adaptation primarily seen in halophytes (like Mangroves) growing in harsh, saline marshy environments.
Q. 55. As per the recent RBI bulletin, what was the retail inflation in 2024-2025?
(A) 4.1%
(B) 4.6%
(C) 3.4%
(D) 4.3%
Answer:
(B) 4.6%
Explanation:
Based on macro-economic RBI projections and bulletins released near the cycle, average retail inflation targets clustered closely around 4.5% to 4.6%.
