Class 9th · Biology · Chapter 9
Chapter 9: Plant Physiology
Chapter 9 of the Punjab Board Class 9th Biology textbook runs from page 133 to 150 and covers 8 topics. Open any of those pages in GenZ Books, tap a question, and the answer is worked from this chapter.
Open Chapter 9 of Biology in GenZ Books
The same Class 9th textbook, page for page. Tap any question and get the answer worked from that chapter — English and Urdu.
Topics in this chapter
- 9.1Nutrition in Plantsp. 134
- 9.2Transport in Plantsp. 136
- 9.3Transpirationp. 138
- 9.4Transport of Water and Salts in Plantsp. 140
- 9.5Translocation of Food in Plantsp. 141
- 9.6Gaseous Exchange in Plantsp. 142
- 9.7Mechanisms for Excretion in Plantsp. 144
- 9.8Osmotic Adjustments in Plantsp. 146
A sample answer from GenZ Books
Explain · page 150: 8. How do the plants of rubber andhke excrete their wastes?
Plants such as rubber excrete their wastes mainly through stomata on the leaves, and additionally through lenticels on stems and roots. Stomata are tiny pores that open to release gases like excess oxygen and water vapor, while lenticels allow gas exchange from the inner tissues of the stem and root. This continuous release keeps the plant’s internal environment balanced and prevents the buildup of harmful substances.
AI-generated from the chapter text by GenZ Books. It can make mistakes — check it against your textbook and your teacher.