STUDY NOTES FOR BIOLOGY CHAPTER 9 – PLANT BIOLOGY

Expert teachers have specially curated these notes to simplify and enlighten concepts given in IB Biology HL. The notes are comprehensive and are sufficient to study the chapter in-depth, and one need not look for other resources beyond the notes provided on our website, which can be accessed for free. The notes for Plant BIology IBDP HL are available on our official website and can be downloaded for free. You are one click away from obtaining all that you need to score well in IB Biology HL.

The material made available on Tychr’s website is available for all IBDP subjects. It is specially curated after an extensive amount of effort to ensure that the notes are in consonance with the IB curriculum and are an amalgamation from various textbooks prescribed by the IBO. Students often face a challenge understanding concepts, especially concepts that are new and tricky. These IB Biology Notes will help the student cover the chapter on Plant Biology entirely while explaining each concept in a detailed and easy way. 

Biology IBDP  is a part of group 4 Sciences of the IB Curriculum. The IBDP Biology course is the study of living organisms and their interaction with their surroundings. Students who opt for this course can better understand physiology, their environments, genetics etc. 

In Biology, the interaction of these approaches forms the basis of a holistic and integral approach to understanding biological processes and life as dynamic and complex phenomena; these enable students to understand the diversities and commonalities between living beings and environments.

The interaction of these approaches focuses on the CORE areas of Cell Biology, Molecular biology, Genetics, Ecology, Evolution and biodiversity, and human physiology.

In this unit, we will understand the transport mechanism inside a plant and study growth and photoperiodism. We start with the leaf structure. It comprises guard cells, stomata, spongy and palisade mesophyll, xylem, phloem and epidermis. In plants, water is transported with the help of the xylem’s tracheids and vessels. Guard cells regulate the opening and closing of stomata because of the turgidity and uneven thickening of the cell wall.

Fluids move in plants because of cohesion between the water molecules, adhesion between water molecules and xylem vessels and the tension created by all these phenomena leading to the formation of a water column. Water lost due to evaporation creates a pull in the water column in the vessels, which replaces the lost water by pulling water from the root cortex into the xylem.

Net we discuss Phloem, which is involved in the transport of organic molecules according to the pressure-flow hypothesis according to which sugar is loaded into the sieve tubes at leaves(SOURCE) and formation of concentration gradient allows forces water from surrounding cells to enter the sieve tubes cells as well which creates hydrostatic pressure. And water flows from the source (high hydrostatic pressure) to the reservoir. Then we discuss growth in plants, which is of indeterminate growth pattern. Meristematic tissue can give rise to derivatives like dermal, ground, and vascular tissues.

Plant hormones travel via phloem and affect the target cells. Phototropism is affected by Auxin. Flowers are the reproductive organs in angiosperms, and fertilisation occurs by pollination.

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