NEET 2027 cheat sheet for Botany! 📱 Practice 1 Lakh+ PYQs on ExamBhai.com! - Free Study Material

Botanical Science Essentials & High-Yield Summary

Mastering Botany for competitive entrance examinations like NEET requires a clear, conceptual understanding of plant morphology, cell biology, genetics, and plant physiology. Below is an essential chapter-wise reference guide designed for effective revision.

1. Cell: The Unit of Life & Cell Cycle

• Prokaryotic vs. Eukaryotic: Prokaryotes lack membrane-bound organelles; eukaryotes possess distinct nuclei and membrane-bound structures like chloroplasts and mitochondria.
• Mitosis vs. Meiosis: Mitosis produces two genetically identical diploid (\(2n\)) daughter cells, whereas meiosis generates four genetically diverse haploid (\(n\)) gametes.
• Mitotic Index Equation: \[\text{Mitotic Index} = \frac{\text{Number of cells in mitosis}}{\text{Total number of cells}}\]

2. Plant Physiology: Photosynthesis & Respiration

• Photosynthesis Overview: Light reactions convert solar energy into chemical energy (\(\text{ATP}\) and \(\text{NADPH}\)) in the thylakoid membranes, driving the Calvin cycle in the stroma.
• Overall Photosynthesis Reaction: \[6\text{CO}_2 + 12\text{H}_2\text{O} \to \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 + 6\text{H}_2\text{O}\]
• Respiratory Quotient (RQ): The ratio of carbon dioxide evolved to oxygen consumed during cellular respiration: \[\text{RQ} = \frac{\text{Volume of } \text{CO}_2 \text{ evolved}}{\text{Volume of } \text{O}_2 \text{ consumed}}\] Note: \(\text{RQ} = 1.0\) for carbohydrates, \(\text{RQ} < 1.0\) for fats and proteins.

3. Genetics & Inheritance Patterns

• Mendelian Monohybrid Cross: Phenotypic ratio is \(3:1\); Genotypic ratio is \(1:2:1\).
• Mendelian Dihybrid Cross: Phenotypic ratio is \(9:3:3:1\).
• Hardy-Weinberg Equilibrium: Allele frequencies in a stable population remain constant across generations: \[p + q = 1\] \[p^2 + 2pq + q^2 = 1\] where \(p\) represents the frequency of the dominant allele and \(q\) represents the frequency of the recessive allele.