Which of the following Archaebacteria is responsible for the production of biogas from animal waste?
A. Cyanobacteria
B. Thermoacidophiles
C. Halophiles
D. Methanogens
Answer: Option D
Solution (By JKSSB Mock Tests)
Methanogens are strict anaerobic Archaebacteria that produce methane (biogas) as a metabolic byproduct in hypoxic environments. They are commonly found in the guts of ruminant animals (like cows and buffaloes) and in anaerobic sludge digesters. Halophiles thrive in high salt, thermoacidophiles in hot acidic environments, and cyanobacteria are photosynthetic Eubacteria.
Explanation:
Monocot stems have numerous vascular bundles scattered in the ground tissue. They are closed (lack cambium), collateral, and hence do not undergo secondary growth. Dicot stems have vascular bundles arranged in a ring, open (with cambium) allowing secondary growth. Radial vascular bundles are characteristic of roots. Scattered bundles are a key identifying feature of monocots.
Consider the following statements about biodiversity:
1. Biodiversity includes genetic, species, and ecosystem diversity.
2. Hotspots are regions with high endemism and habitat loss.
3. The Western Ghats is a biodiversity hotspot.
Which of the above is/are correct?
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