Question : Which of the following tissues are responsible for the secondary growth of plants?
Option 1: Cortex
Option 2: Cambium
Option 3: Phloem
Option 4: Xylem
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Correct Answer: Cambium
Solution : The correct option is Cambium
Secondary growth occurs in dicotyledonous plants (dicots) and some gymnosperms, whereas most monocotyledonous plants (monocots) have little or no secondary development. The tissues involved in secondary growth are of two categories. The vascular cambium is a thin layer of meristematic tissue present in the stems and roots of woody plants between the primary xylem and primary phloem. Cork cambium (Phellogen) is another meristematic tissue found in the outer layers of roots.
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Question : In which of the following classes are the pulse-producing plants kept?
Option 1: Solanaceae
Option 2: Malvaceae
Option 3: Leguminosae
Option 4: Liliaceae
Question : Which one of the following is not a major component of the biotic environment?
Option 1: Plants
Option 2: Animals
Option 3: Decomposers
Option 4: Water
Question : Which of the following acids is responsible for muscle fatigue in humans?
Option 1: Acetic acid
Option 2: Nitric acid
Option 3: Lactic acid
Option 4: Hydrochloric acid
Question : What was the main aim of the First Five Year Plan?
Option 1: Self-dependent
Option 2: Industrial growth
Option 3: Economic growth
Option 4: Agricultural growth
Question : Which of the following states registered the highest growth in literacy rate during 2001-2011?
Option 1: Arunachal Pradesh
Option 2: Bihar
Option 3: Sikkim
Option 4: Punjab
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