An organism's body has a large proportion of dead cells, have low energy needs, and can use relatively slow transport system. This organism could be :
Fishes
Plants
Reptiles
Human beings
Plants do not move from one place to other and have low energy requirement.
Assertion: Plants do not require an active pumping system like heart for transportation.
Reason: Plants have large proportion of dead cells and energy requirement is high.
Plants can use relatively slow transport system. Why?
How could you appreciate function of tiny cell in a large body of an organism.
There are four tiny organisms A, B, C and D. organism A is a parasitic protozoan that causes a disease known as kala-azar. The organism B is a microscopic single-celled animal that causes malaria disease in human beings. The organism C is a unicellular animal that can change its body shape according to need, it has no fixed shape. The organism D is also a unicellular animal that is slipper-shaped having a large number of tiny hair all around its body. (a) Name the organisms A, B, C and D (b) Name one characteristic body feature of organism A. (c) Name the insect which carries organism B and transmits it from one person to another. (d) What name is given to the asexual method of reproduction of (i) organism A, and (ii) organism B? (e) Where do organisms C and D live?