Transportation Excretion and Circulation in Plants and Animals

1221 WordsAug 16, 20125 Pages
Notes by Ankur upaadhyay gujarat board/combined science igcse.9998791839 india. Q.1 Explain transportation of water in plants. A.1 (1) Higher plants possess xylem which is associated with the transport of water. (2) Water absorbed by the root from the soil is transported to stem, branches, leaves and flowers. (3) The main structural components of the xylem responsible for the transport of water are tracheids and vessels. (4) As the root cells are directly in contact with soil,they take up ions.due to this, a difference is created between concentration of these ions between the root and the soil. (5) Water moves into the root from the soil to elimlnate this difference.This water movement creates a column of water that is steadily…show more content…
Q.5 Write short note on Lymphatic system. A.5 Lymphatic system consists of lymph,lymph vessels,lymphatic capillaries and lymphatic nodes.Lymph is another type of fluid which is also involved in transportation.Some amount of plasma, proteins and blood cells,escape into the intercellular spaces through the pores present in the wall of capillaries,form lymph.Lymph is colorless and contains less proteins as compared to that in the blood. Lymph drains into lymphatic capillaries form intercellular spaces.Lymphatic capillaries join to form lymph vessels that finally open into large veins.Lymphatic system performsfollowing three important functions: 1) Collect intercellular fluid through the medium of lymph vessels and returns it to blood circulation. 2) In the villi of small intestine, lymph vessels absorb lipids and conduct them to blood circulation. 3) Protects against diseases. Q.6 Explain removal of waste products in plants. A.6 In plants O2 may be considered as waste product generated during photosynthesis and

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