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How do organisms like amoeba transport materials?
Amoeba is a unicellular organism. In unicellular organisms a single cell carries out all the life processes as the cell itself is the organism. The uptake of materials from the environment is through the general body surface and the transport within the cell is by diffusion.
Why do higher plants and animals need a transportation system?
In higher plants and animals, the sites of absorption and synthesis are very specific and a greater distance from the other parts of the body. Thus, they need a transportation.
What is mass flow system?
The transport of materials in bulk across the plant or animal body through the vascular tissue is called the mass flow system.
Which transport system- plant or animal, does not use muscular energy?
Transport in plants does not use muscular energy.
What are vascular plants?
The higher plants are also called the vascular plants as the transport in them is with the help of the vascular system.
which are the materials transported in plants?
The materials transported across the plant body are water, minerals, food and metabolites like the hormones and vitamins.
What are the two types of vascular tissues?
The two types of vascular tissues are xylem and phloem.
What are the functions of xylem and phloem?
Xylem conducts water from the roots to the other parts of the plant and phloem conducts food from the leaves to the different parts of the body.
Which tissue conducts organic substances in plants?
Phloem conducts organic substances in plants.
Why are the sieve tube cells called so?
The sieve tube cells are joined end to end and their end walls are performed. This gives the appearance of a sieve and hence they are called as the sieve tube cells.
What is the process by which carbon dioxide enters the cell?
The process by which carbon dioxide enters the cell is called diffusion.
The process of movement of solvent particles from the region of higher concentration to the region of lower concentrations through a semi- permeable membrane is called osmosis.
What is turgor pressure?
It is a positive pressure developed inside the cells due to pushing of the cytoplasm against the cell wall as cytoplasm gets more water.
When does a cell become flaccid?
A cell becomes flaccid on losing water.
What is active transport? Give an example.
Active transport is the transport are stomatal, lenticular and cutocular transpiration.
What is transpiration?
It is the loss of water from the aerial parts of the plant in the form of water vapour
What are the three types to transpiration?
The three types of transpiration are stomatal, lenticular and cuticular transpiration.
What are stomata? Where are they present?
Stomata are opening on the surface of the leaves that are surrounded by the guard cells. They are present more on the lower surface of the leaves.
How is the rate of transpiration affected?
The rate of transpiration is affected by many factors such as light, temperature, availability of soil water and atmospheric humidity.
Why is transpiration affected?
Transpiration is important because:
- It is responsible for uptake of water from the soil.
- It is responsible for movement of water and dissolved minerals from the roots to different parts of the plants.
- It results in cooling of the leaf surfaces, thereby protecting them from excessive heat.
What is ascent of sap?
he upward movement of water along with the dissolved silutes up the xylem is called ascent of sap.
What are the two factors responsible for ascent of sap?
The two factors responsible for ascent of sap are root pressure and transpiration pull.
What are root hairs? What is their function?
Root hairs are outgrowths of the epidermal cells. They help in increasing the surface area of water absorption.
What is root pressure?
The water enters the roots through the root hairs. It then travels through the root tissue to reach the root xylem. Therefore, the xylem in the root has more water than the xylem column above it and this creates a positive pressure in the xylem of the root. This is called the root pressure.
What is transpiration pull? What is its effect?
The force with which the water is pulled up the xylem is called the transpiration pull. The transpiration pulls results in a continuous stream of water called the transpiration stream extending from the xylem of the leaves to the xylem of the roots.
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