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प्रश्न
The disease kala-azar is caused by a micro-organism known as :
(a) Planaria
(b) Leech
(c) Leishmania
(d) Plasmodium
उत्तर
(c) Leishmania
It is a protozoan which causes kala-azar.
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संबंधित प्रश्न
..................... type of reproduction occurs in Hydra.
(a) Binary fission
(b) Multiple fission
(c) Budding
(d) Fragmentation
Describe the process of reproduction in Hydra with the help of labelled diagrams. What is the name of this process of reproduction?
Name one unicellular organism which reproduces by the same asexual process as Hydra.
What care should be taken while making a cutting from a plant?
When the branches of a plant growing in the field are pulled towards the ground and a part of them is covered with moist soil (leaving the tips of the branches exposed above the ground), then after some time new roots develop from the parts of branches buried in the soil. On cutting these branches from the parent plant, new plants are produced from the cut parts of branches which had developed roots.
(a) What is this method of propagation of plants known as?
(b) What type of branches should a plant have to be able to be propagated by this method?
(c) Name any two plants which are grown for their flowers and propagated by this method.
(d) Name any two plants which are grown for their fruits and propagated by this method
(e) Name one plant which gets propagated by this method naturally by forming runners (soft horizontal stems running above the ground).
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
Observe the given picture and answer the questions given below.
- State the type of reproduction.
- Identify the part of reproduction.
Sweet potato - _____________
Bryophyllum - _____________
Potato - _____________
- Which type of reproduction is indicated in the following diagram?
- Redraw the given type of reproduction in the correct sequence and explain it.
In Spirogyra, asexual reproduction takes place by
