Plant Tissue: Definition, Classification, Distribution and Functions including Mechanical tissues.   Which tissue is responsible for the secondary growth in dicot stems? (a) Apical meristem (b) Intercalary meristem (c) Lateral meristem (d) Parenchyma Answer: (c) Lateral meristem Explanation: The lateral meristem includes vascular cambium and cork cambium, which are responsible for increasing the thickness (girth) of dicot stems. This secondary growth is crucial for structural support in woody plants. Collenchyma provides mechanical support primarily to: (a) Roots (b) Young stems and petioles (c) Woody stems (d) Leaves only Answer: (b)…

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Prokaryotes and Eukaryotes: Characteristics, and differences with reference to their Nuclear and cell wall compositions.   Which of the following is a key difference between prokaryotic and eukaryotic nuclei? Prokaryotes have a nuclear membrane; eukaryotes do not. Eukaryotes have a nucleoid; prokaryotes have a true nucleus. Prokaryotic DNA is circular and lacks histones; eukaryotic DNA is linear with histones. Eukaryotes lack chromatin; prokaryotes have condensed chromatin. Answer: C Explanation: Prokaryotes have circular, histonefree DNA in a nucleoid, while eukaryotes have linear DNA bound to histones in a membranebound nucleus.  …

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