Q. 43.7( 131 Votes )
Why is transport of materials necessary in a plant or animal? Explain.
The transport system is necessary for a plant or an animal because of the following reasons:-
1) In plants, water and dissolved minerals are transported from roots to leaves by xylem whereas prepared food is transported from leaves to all parts of the plant by phloem. If there were no transport system in the plant, leaves would not get water for photosynthesis and thus, they would die.
2) In the case of animals, food and water are transported to all parts of the body so; they can generate energy and grow cells. Similarly, waste products produced by the cells of the body are transported to their excretory organs so that they can be excreted. If there were no transported system in animals, they would not be able to get energy or get rid of the waste. Thus, they would die.
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Fill in the blanks of the following paragraph using just two words – arteries and veins.
___(a)___ carry oxygen-rich blood from the heart to all parts of the body and ___ (b)___ carry carbon dioxide-rich blood from all parts of the body back to the heart. ___ (c)___ have thin walls and __ (d)___ have thick elastic walls. Blood flows at high pressure in ___ (e)____. Valves are present in __ (f) ___ which allow blood to flow only towards the heart. __ (g)___ divide into smaller vessels. These vessels further divide into extremely thin tubes called capillaries. The capillaries join up to form ____ (h)_____.NCERT - Exemplar Science
What are the components of blood?NCERT Science
Fill in the blanks.
i. The blood from the heart is transported to all parts of the body by the _________.
ii. Hemoglobin in present in ______ cells.
iii. Arteries and veins are joined by a network of _____.
iv. The rhythmic expansion and contraction of the heart is called_____.
v. The main excretory product in human beings is ______.
vi. Sweat contains water and ________.
vii. Kidneys eliminate the waste materials in the liquid form called______.
viii. Water reaches great heights in the trees because of suction pull caused by _______.NCERT Science
(a) Name the only artery that carries carbon dioxide-rich blood.
(b) Why is it called an artery if it does not carry oxygen-rich blood?NCERT - Exemplar Science
The absorption of nutrients and exchange of respiratory gases between blood and tissues takes place in –NCERT - Exemplar Science
Observe Figure 11.2 and answer the given questions: Fig 11.2
(a) Name the instrument.
(b) Label the parts A, B, and C.NCERT - Exemplar Science
Name the organ which is located in the chest cavity with its lower tip slightly tilted towards the left.NCERT - Exemplar Science