The type of plant that has adapted to survive in very dry environments is called:
A. Mesophyte
B. Hydrophyte
C. Xerophyte
D. Halophyte
Answer: Option C
Solution (By JKSSB Mock Tests)
Xerophytes (e.g., cactus, acacia) have adaptations like thick cuticle, sunken stomata, reduced leaves, and water-storing tissues to conserve water in arid habitats. Hydrophytes live in water, mesophytes in moderate conditions, halophytes in saline soils. Xerophytes minimize transpiration and maximize water uptake.
Explanation:
The soma (cell body) of a neuron contains the nucleus and metabolic machinery. Dendrites receive signals from other neurons and transmit them towards the soma, while the axon carries impulses away from the soma. The myelin sheath speeds up conduction by saltatory conduction (jumping between nodes), not continuous conduction.
Explanation:
Semi-conservative replication means that when a new DNA double helix is formed, it consists of one original (parental) strand and one newly synthesized strand. This was proven by the Meselson-Stahl experiment in 1958 using isotopes of nitrogen (15N and 14N) in E. coli. This mechanism ensures genetic continuity.
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