Is pollination and fertilisation necessary in apomixis? Give reasons.

Monjur Alahi

Is pollination and fertilisation necessary in apomixis? Give reasons.


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Salim Ahmed Kawsar

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No, they are not necessary. Apomixis is actually an alternative to sexual reproduction, although the female sexual apparatus is used in the process. In apomicts, embryos can develop directly from the nucellus or synergid or egg. Therefore, there is no need for either pollination or fertilisation.

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………. leads to development of zygote without fertilisation. 

(A) Parthenogenesis

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External fertilisation occurs in  A) frog – snake  B) fish – snake C) frog – fish  D) fish – rat

(C) frog – fish

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The fertilisation which occurs outside the body is 

(A) External fertilisation

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Find out the incorrect sentence regarding fertilisation in fish 

(C) Male produces only one sperm

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After fertilisation implantation of zygote takes place in the uterine walls of females after 

(D) 7 – 10 days

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At the time of fertilisation in embryo sac b the cell which is in diploid state : 

(A) Polar nuclei

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The parts of flower useful even after fertilisation

Answer is (A) Ovule

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Which of the following is necessary for internal fertilisation to occur but NOT necessary for external fertilisation?

(B) The sperm should reach inside the body of the female.

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1. (a) Is ammonia more dense or less dense than air? (b) What property of ammonia is demonstrated by the Fountain Experiment? (c) Write the balanced equation for the reaction between ammonia and sulphuric acid. 2. Pick the odd member from the list giving reasons: (a) Ammonia, sulphur dioxide, hydrogen chloride, carbon dioxide. (b) Copper oxide, aluminium oxide, sodium oxide, magnesium oxide. 3. Give reasons for the following : (a) Liquid ammonia is used as a refrigerant in ice plants. (b) Aqueous solution of ammonia is used for removing grease stains from woollen clothes. (c) Aqueous solution of ammonia gives a pungent smell. (d) Aqueous solution of ammonia conducts electricity.

(1) (a) ammonia is less dense than air (b) solubility in water (c) 2NH3 + H2SO4 → (NH4)2SO4 (2) (a) Ammonia → because - NH3 is basic while, SO2,HCl and CO2 are acidic oxides. (b) CuO,...

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It is said apomixis is a type of asexual reproduction. Justify.

In apomixis, there is no fertilization involved. Since, it does not involve fertilization, it is used as asexual means or vegetative propagation method. Though it is asexual, it still uses...

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