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प्रश्न
A student has to observe a permanent slide of binary fission in Amoeba. Find the correct sequence of steps given below for focussing the object under a microscope.
(a) Place the slide on the stage, look through the eye-piece and adjust the mirror to get proper illumination.
(b) Focus the slide sharp using fine adjustment screw
(c) Look through the eye-piece and raise the objective lens using coarse adjustment screw till the object is focussed.
(d) Look through the eye-piece and move the slide till the object is visible.
(A) d, c, b, a
(B) a, b, d, c
(C) a, d, c, b
(D) a, c, d, b
उत्तर
The correct order of steps is a, d, c, b.
The correct answer is C.
संबंधित प्रश्न
What is vegetative propagation?
Name two plants which are usually propagated by artificial propagation methods. Name the method of artificial propagation used in each case.
A worm X found in freshwater and slow-moving streams has been accidently cut into three pieces. It was observed that in due course of time, each cut piece of the worm develops to become a complete worm by growing all the missing parts.
(a) Name the worm X which can exhibit this phenomenon of making complete worm from its cut body parts.
(b) Name another organism Y which possesses the same characteristic of growing fully from its cut body parts.
(c) What is the name of this process in which a complete organism is formed from its cut body part.
(d) State whether X and Y are unicellular and/or multicellular organisms.
(e) Can a dog be produced completely form its cut body part (say, a cut tail) just like organisms X and Y? Why?
Write a short note on Vegetative reproduction.
Define the following:
Binary fission
Define the following:
Tissue culture
Mention the common method of reproduction in Jasmine.
In hydra the type of reproduction is ___________.
Asexual reproduction is also known as ______.
Offspring formed by the asexual method of reproduction have greater similarities among themselves because ______
(i) asexual reproduction involves only one parent
(ii) asexual reproduction does not involve gametes
(iii) asexual reproduction occurs before sexual reproduction
(iv) asexual reproduction occurs after sexual reproduction
