How does binary fission differ from multiple fission?
Asexual reproduction occurs in different ways in different organisms. So, binary fission and multiple fission both are the types of asexual reproduction.
Binary fission:- It is the division of parent cell into two small daughter nucelii. Mainly three types of binary fission shown in some organisms- Irregular, longitudinal, transverse. Like in protozoan protists, the replicated chromosome separated by intranuclear mitosis and starts dividing. Then, the cytoplasm constricts between two separating nuclei and forms two equal sized daughter nuclei with a nucleus (eg. Amoeba shows irregular fission, Euglena shows longitudinal fission and Paramecium shows transverse binary fission). Or like in Planarians also, they are divided by transverse binary fission with the equal sized daughter individuals.
Multiple fission:- Unlike binary fission, the division of parent cell will be into many small daughter nuclei. And it can be shown in mainly two organisms- Plasmodium or Amoeba. Plasmodium is a malarial parasite, when multiple fission takes place in adults or in its encysted zygote (called sporogony) and their daughter individuals are then called merozoites.
Why is variation beneficial to the species but not necessarily for the individual?
Draw a labelled diagram of the longitudinal section of a flower.
What are the functions performed by the testis in human beings?
Why does menstruation occur?
How will an organism be benefited if it reproduces through spores?
Asexual reproduction takes place through budding in
(a) amoeba.
(b) yeast.
(c) plasmodium.
(d) leishmania.
Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?
How does the embryo get nourishment inside the mother’s body?
What are the advantages of sexual reproduction over asexual reproduction?
What is the importance of DNA copying in reproduction?
Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
What is a good source of energy?
Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
What changes can you make in your habits to become more environment-friendly?
What is the difference between a reflex action and walking?
If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier?
Why should a magnesium ribbon be cleared before burning in air?
Define the principal focus of a concave mirror.
You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?
Use the data in Table 12.2 to answer the following –
(a) Which among iron and mercury is a better conductor?
(b) Which material is the best conductor?
Describe double circulation of blood in human beings. Why is it necessary?
Why does distilled water not conduct electricity, whereas rain water does?
In the Modern Periodic Table, which are the metals among the first ten elements?
Define the unit of current.
On what factors does the resistance of a conductor depend?
Why does a compass needle get deflected when brought near a bar magnet?
Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?
How are the lungs designed in human beings to maximise the area for exchange of gases?
How is the sex of the child determined in human beings?