Question
Biology Question on sexual reproduction in flowering plants
What indicates 'X' and 'Y' in the following diagram?
A
X=Egg cell: Y= Synergid
B
X= Synergid; Y= Filiform apparatus
C
X= Filliform apparatus: Y= Synergid
D
X= Egg cell; Y= Filiform apparatus
Answer
X= Filliform apparatus: Y= Synergid
Explanation
Solution
The correct answer is option (C): X= Filliform apparatus: Y= Synergid
Synergids are present laterally in egg cells. They also have finger-like projections called filiform apparatus.
The function of synergids are:
They act as shock absorbers when there is an entry of pollen tubes.
They also secrete substances that can attract the pollen tubes
Out of two, one of the degenerates provides the entry of the pollen tubes.
The Filiform apparatus helps in guiding the pollen tube during entry.