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Principles Of Inheritance And Variation

Question
CBSEENBI12001906
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(a) Why is fertilization in an angiosperm referred to as double fertilisation? Mention the ploidy of the cells involved.

(b) Draw a neat labeled sketch of L.S. of an endospermous monocot seed.

Solution

(a) Double fertilization is a characteristic feature of flowering plants or angiosperms. In the process of double fertilization, out of the two sperm nucleus, one sperm nucleus fuses with the egg nucleus to form an embryo (process is called syngamy) and another fuses with polar nuclei to form endosperm (process is called triple fusion). Since two kinds of fusion; syngamy and triple fusion take place, the process is known as double fertilisation.

Ploidy of the cells involved

Cell

Ploidy

Egg cell

Haploid

Both Male nuclei

Haploid

Central cell

Diploid

Zygote

Diploid

Endosperm

Triploid

(b) L.S of endospermous monocot seed

Some More Questions From Principles of Inheritance and Variation Chapter

What is Mendel’s monohybrid phenotypic ratio ?

Write down Mendel’s dihybrid Phenotypic ratio 

Who were the rediscoverers of Mendelism ?

What are the real determinants of what an organism will become ?

What is the unique feature of F1 generation ?

What will be the genetic make up of an organism which suffers from sickle cell anaemia ?

What do the symbols square and circle in a pedigree chart indicate ?

Define heterogamy. Give an example.

How many chromosomes are found in human cells ?

Why is male Drosophila regarded as heterogametic ?

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