Tuesday , July 5 2022
NCERT 7th Class (CBSE) Science: Transportation in Animals and Plants

NCERT 7th Class (CBSE) Science: Transportation in Animals and Plants

Question: Why does the rate of heartbeat increase after running?

Answer: The sale of the heartbeat increases after running due to increase in circulation of blood as more blood is required to be pumped.

Question: In what ways are xylem and phloem important for tranportation of meterials in plants?

Answer: Flowering plants have a well developed transport system called a vascular system is composed of pipe like versels called xylem and phloem. Xylem transports water and minerals upwards from the roots. Phloem cells also from long-tubes for transportation of food. Phloem transports glucose made in the leaves to the other parts of the plants.

Question: Differentate between xylem and phloem.

Answer: Differentate between xylem and phloem are:

Xylem transports water and minerals upwards from the roots.
Phloem transport glucose made in leaves to other parts of the plant.
The cell of the xylem are joined end to end forming long tube which extend from the tip of the roots to the leaves.
The cells of Phloem also form long-tubes which transports from leaves to the other parts.

Question: What does circulatory system consists of? Give the main function of each?

Answer: The circulatory system consists o the blood, the blood vessels and the heart.

The blood – is a specialized bodily fluid that flows in blood vessels. It transports –

  1. Digested food from the small inters tine to all parts of the body.
  2. Blood cells are divided into three parts – WBC’s, RBC’s, Platelets.

The Blood vessels Blood circulates across the body through a network of tubes called blood vessels. There are three types of blood vessels. – Arteries, Veins and Cappileries.

The Heart – It is fist-sized muscular organ located between the lungs. Its function is to pump blood to all parts of a body.

If you observe a drop of blood under a microscope, which cell would you see? What are the functions of the cell?

Answer: We can see three types cells – RBC’s, WBC’s, Platelets

  • RBC’s – are disc shaped cell which contain a red-coloured protein called hemoglobin. It is this pigment that absorb oxygen and transports it to the cells all over  the body.
  • WBC’s – are sighity larger RBC’s. They are fewer in number than RBC’s. Their main job is to fight against diseases by destroying harmful bacteria and other fore in materials.
  • Platelets – are small than red blood cells. They help the blood to clott whenever there is around in the body.

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