Fluorine has the highest electronegativity. As a fluorine is the smallest and first element of its group. So, down the group of electro-negativity decreases due to increase atomic size.

Lactic acid (C₃H₆O₃) is formed when we respire anaerobically. Condition is that, when the heart and lungs cannot work fast enough to provide enough oxygen around the body to breakdown the glucose.

Class 10th Science Session 2022-23 Class 10 Science Terminal Exams MCQ Solutions Class X Science MCQ Extra Questions Answers 10th Science Terminal Exam Based MCQ Extra Questions

The cell theory was proposed by Schleiden and Schwann in 1839, postulating that all living beings are composed of cells and their products. In 1855, Rudolf Virchow modified the cell theory with his postulate, “Omnis cellula-e-cellula”, which means, a new ...

Cutin is protective, hydrophobic, waxy covering produced by epidermal cells of leaves, young shoots and other aerial parts. It minimises the water lost through transpiration (with the help of stomata) and also reduces pathogen entry. Lignin hardens the cell wall ...

The flexibility in plants is due to Collenchyma. It also provides mechanical support to plants.