Refer to the figure showing the initial stage of double fertilization. 
The second sperm in double fertilization fuses with what other cell(s) in the embryo sac?
Definitions:
MBI Stock
This term does not seem to reference a commonly recognized financial instrument or concept; it might refer to the stock of a specific company identified by the acronym MBI, but without further context, a detailed definition cannot be provided.
Futures Call Option
A financial contract that gives the buyer the right, but not the obligation, to buy an underlying asset at a specified price on or before a certain date.
Futures Contract
A contractual arrangement to purchase or sell a specific asset or commodity at an agreed price on a future date.
Specified Price
A pre-determined price agreed upon by all parties involved in a transaction.
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