Short essay ch11

Huck invents an elaborate story about how his family got on the wreck and convinces the watchman to take his ferry to help. Meanwhile, the wreck of the Walter Scott drifts downstream and, although the ferryman has gone to investigate, the robbers clearly have not survived.

Short essay ch11

The wind speed because of fan will increase the transpiration process. More water is lost by the plants thus creating a higher suction pull. What is wilting of plants? If water is lost more quickly than it is absorbed by the root hairs, it will result in loss of water in plants.

The leaves, flower and stem of the plant droop. It is known as wilting. Why is transport of materials necessary in a plant or in an animal?

Transport of materials is necessary in plants and animals due to following reasons: All livings beings need food, water and oxygen for survival and to perform various activities. It is necessary to transport these materials to various parts of the body.

Short essay ch11 and oxygen are transported to all cells of the body so that they can generate energy and grow. Waste products generated by cells need to be transported to excretory organs.

Short essay ch11

If it does not happen, the organism may die because of poisoning by these waste material. What is vascular system of plants? Higher plants have well defined transport system called vascular system.

It consists of pipe-like vessels called xylem and phloem. Xylem tissues join together and form long tubes.


They transport water and minerals from roots to all parts of the plant. Phloem tissues also join together and form long tube which carry food from leaves to various parts of the plant body.

Short essay ch11

What will happen if there are no platelets in the blood? Platelets help in clotting of blood whenever there is a wound on the body. If platelets are not present in the blood, clotting will not happen and bleeding will continue.

The prolonged blood loss may result in death of the person. When platelets are absent and there is no blood clotting occurs, this disease is called haemophilia. Name the various transport systems present in human beings and mammals. Give two functions of stomata. Stomata are the tiny pores that present on the surface of leaves.

The functions of stomata are: The water evaporates through the stomata by the the process of transpiration. Exchange of gases carbon dioxide and oxygen also take place through stomata. These gases are used in photosynthesis and respiration process in the plants.

Does transpiration serve any useful function in the plants? Transpiration of water from leaves creates a suction pull, due to which water rises up high in tall trees. Transpiration also cools the plant. What does blood transport in human body? Why is blood needed by all the parts of a body?

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