in pinus endosperm cell have 30 chromosome then how many chromosomes are present in sieve cells ans.. 60 but plz explain how ?

Which of the following compound is produced when ethano (C5H5Oh ) is dehyrated

What is the difference between ovary and ovule culture, what are their advantages and disadvantages

 

What is Glycolessis ? Explain about Glycolessis and what it's part and functions

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How is ulna a pivot joint a bone is unbendable so how is ulna a pivot joint