Photoperiodism | Class 11 Biology | Plant Physiology | Chapter 8 | New Book 2025

In this video, we explain Photoperiodism in a simple and conceptual way from Class 11 Biology (New Book 2025), Chapter 8: Plant Physiology. Photoperiodism is an important physiological phenomenon in plants in which flowering and other developmental processes are regulated by the length of day and night.
This lecture covers the definition of photoperiodism, its importance in plants, and how plants respond to changes in light duration (photoperiod). We discuss the role of phytochrome pigment in sensing light and darkness and how it controls flowering. Special emphasis is given to the critical photoperiod, which determines whether a plant will flower or not.
The video clearly explains the types of plants based on photoperiodism, including short-day plants, long-day plants, and day-neutral plants, along with suitable examples for better understanding. We also explain how night length is more important than day length in regulating flowering, which is a key concept for board examinations.
This lecture is prepared according to the Punjab Board new syllabus 2025 and is ideal for FSc Part 1 Biology students, teachers, and competitive exam aspirants. Concepts are explained in easy English with proper biological terminology to help students score better in exams.
📘 Topic Covered: Photoperiodism
📗 Chapter: Plant Physiology (Chapter 8)
🎓 Class: 11 Biology (New Book 2025)
📺 Channel: Science Teaching Zone
👉 Like, share, and subscribe to Science Teaching Zone for more high-quality lectures on Biology, Physics, and Chemistry.
Keywords :
photoperiodism, class 11 biology, plant physiology, photoperiodism in plants, flowering in plants, phytochrome, short day plants, long day plants, day neutral plants, critical photoperiod, fsc part 1 biology, punjab board biology 2025, plant physiology class 11
Hashtags:
#Photoperiodism #Class11Biology #PlantPhysiology #FloweringInPlants
#ShortDayPlants #LongDayPlants #DayNeutralPlants #Phytochrome
#Biology2025 #FScPart1 #PunjabBoard #ScienceTeachingZone