RBSE Class 7 Science Notes Chapter 11 Transportation in Animals and Plants

These comprehensive RBSE Class 7 Science Notes Chapter 11 Transportation in Animals and Plants will give a brief overview of all the concepts.

RBSE Class 7 Science Chapter 11 Notes Transportation in Animals and Plants

→ Circulatory system consists of the heart and blood vessels.

→ Blood consists of plasma, RBC, WBC and platelets. Blood is red due to the presence of a red pigment, haemoglobin.

→ Two types of blood vessels, arteries and veins are present in the body.

→ The heart is an organ which beats continuously to act as a pump for the transport of blood, which carry other substances with it.

→ The two upper chambers are called the atria (singular - atrium) and the two lower chambers are called the ventricles. The partition between the chambers helps to avoid mixing up of blood rich in oxygen with the blood rich in carbon dioxide.

→ The doctor feels your heartbeats with the help of an instrument called a stethoscope.

→ The rhythmic beating of the various chambers of the heart maintain circulation of blood and transport of substances to different parts of the body.

→ The kindneys, ureters, bladder and urethra forin the excretory system.

→ The urine consists of 95% water, 2.5% urea and 2.5% other waste products.

→ Fish excrete waste substances such as ammonia which directly dissolve in water.

→ Birds, insects and lizard excrete uric add in semi-solid form.

→ Plants take water and mineral nutrients from, the soil through the roots and transport it to the leaves.

→ The xylem forms a continuous network of channels that connects roots to the leaves through the stem and branches and thus, transports water to the entire plant.

→ The food has to be transported to all the parts of the plant. This is done by vascular tissue called the phloem.

→ The evaporation of water from leaves generates a suction pull, which can pull water to great heights in the tall trees.

→ A lot of water is lost by plants in the form of vapour through stomata during transpiration.