The heart has four chambers:
two atria and two ventricles. The right atrium receives oxygen-poor blood from
the body and pumps it to the right ventricle. The right ventricle pumps the
oxygen-poor blood to the lungs. The left atrium receives oxygen-rich blood from
the lungs and pumps it to the left ventricle
1 - Why is transport of materials
necessary in a plant or in an animal? Explain.
Answer: The cells of plants and
animals need various substances to carry out important metabolic activities.
Further, many waste products are created during these metabolic activities.
Transport of materials is necessary to supply the various substances and to
remove the waste products.
2 - What will happen if there are no
platelets in the blood?
Answer: Clotting is necessary to
prevent blood loss. Platelets are responsible for clotting of blood. If there
are no platelets, the blood would not clot in case of an injury. This will lead
to excess blood loss and finally in death of the person.
3 - What are stomata? Give two
functions of stomata.
Answer: The innumerable very small
pores on the surface of leaf are called stomata. Transpiration and exchange of
gases (carbon dioxide and oxygen) are some of the functions of stomata.
4 - Does transpiration serve any
useful function in the plants? Explain.
Answer: Transpiration serves
important functions in plants. Transpiration creates the transpiration pull;
which is responsible for the rise of water to great heights in tall plants and
other trees.
5 - What are the components of
blood?
Answer: The main components of blood
are: Plasma, Blood Cells and Platelets.
6 - Why is blood needed by all the
parts of a body?
Answer: Blood acts as a carrier of
various substances. Every part of the body needs certain substances to perform
its functions. Additionally, every part creates some waste products. Blood is
needed by all parts of the body so that various substances can be supplied to
them and waste can be removed from them.
7 - What makes the blood look red?
Answer: Blood is red because of the
presence of a pigment; called haemoglobin.
8 - Describe the function of the
heart.
Answer: The heart is a pumping organ
which pumps the blood. The heart pumps the deoxygenated blood to the lungs; for
oxygenation. Moreover, the heart pumps the oxygenated blood to different parts
of the body.
9 - Why is it necessary to excrete
waste products?
Answer: Waste products can prove
lethal if not removed in time. Hence, it is necessary to excrete the waste
products.
10 - Draw a diagram of the human
excretory system and label the various parts
Answer
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