Give reasons, why.
1. Transpiration is useful to plants.
2. Stomata in desert plants like cactus remain closed during the day.
3. There are other excretory products in plants than O2 and CO2. 4. Double circulation of blood is necessary in human beings.
5. Gastric glands play an important role in digestion of food in humans.
6. Ventricles have thicker muscular walls.
Answers
Answer:
1)Transpiration is the process through which excess water from plant body is released through the stomata present on surface of leaf. ... It helps in maintaining cohesion-adhesion tension, so that water can move through xylem up to leaves. It also helps in cooling process of the tree
2)Stomata remains close during the day time to prevent the loss of water by transpiration. They store the CO2 in their cells until the sun comes out and they can carry on with photosynthesis during the day time
3)Excess water present in the plant body is eliminated by the process of transpiration. Gums, latex, resins, etc. are some other waste products stored in plant parts
4) It is necessary for a human being to separate oxygenated and de-oxygenated blood because this makes their circulatory system more efficient and maintains constant body temperature.
5)The gastric gland is an essential body component because it secretes gastric juice. The gastric juice contains hydrochloric acid, pepsin and mucus. Pepsin helps in digestion of proteins, hydrochloric acid helps in the functionality of pepsin and kills bacteria and mucus protects the inner lining of the stomach
6) The ventricles of the heart have thicker muscular walls than the atria. This is because blood is pumped out of the heart at greater pressure from these chambers compared to the atria. ... This is due to the higher forces needed to pump blood through the systemic circuit (around the body) compared to the pulmonary circuit