Plant Growth and Mineral Nutrition — Flashcards
Maharashtra Board · Class 12 · Biology
25 flashcards for Plant Growth and Mineral Nutrition (Maharashtra Board Class 12 Biology) to test yourself on key terms and facts.
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Define plant growth and explain its quantitative and qualitative aspects.
Answer
Plant growth is a permanent, irreversible increase in the bulk of an organism, accompanied by change of form. Quantitative aspect includes increase in length, breadth, size, volume, mass, dry weight a…
What are the three types of meristems based on location? Describe their functions.
Answer
1. Apical meristem - located at root and shoot tips, responsible for growth in length/height and primary growth. 2. Intercalary meristem - located at nodes/internodes, increases internode length and f…
Describe the three phases of growth with their characteristics.
Answer
1. Phase of cell division - meristematic cells divide mitotically, slow growth rate (lag phase), cells are thin-walled with prominent nucleus. 2. Phase of cell elongation - cells become vacuolated and…
What is the difference between arithmetic and geometric growth? Give their mathematical expressions.
Answer
Arithmetic growth: Growth rate is constant, increase follows arithmetic progression (2,4,6,8). One daughter cell divides, other differentiates. Formula: Lt = Lo + rt. Shows linear curve. Example: Root…
Define AGR and RGR. What do they measure?
Answer
AGR (Absolute Growth Rate) = dn/dt - measures the change in cell number over time interval, represents total growth per unit time. RGR (Relative Growth Rate) = AGR/n - measures growth per unit time ex…
What is a sigmoid growth curve? Describe its three phases.
Answer
Sigmoid (S-shaped) curve represents growth rate vs time for three growth phases: 1. Lag phase - slow initial growth rate 2. Exponential/Log phase - rapid maximum growth rate 3. Stationary phase - grow…
Differentiate between differentiation, dedifferentiation, and redifferentiation.
Answer
Differentiation: Permanent change in cell structure and function leading to maturation, cells lose capacity to divide. Example: Parenchyma forming aerenchyma. Dedifferentiation: Mature cells regain ca…
What is plasticity in plants? Give an example.
Answer
Plasticity is the capacity of plants to change form and structure in response to environmental or internal stimuli during different life phases. It allows plants to adapt to varying conditions. Exampl…
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