Cell-tissue-organ-organ system-organism
Answer:
Answer-(C)
Explanation:
Endosperm and female gametophyte is the plant tissue that have high nutritional value. The function of endosperm is to protect the embryo and gives all the essential nutrient to the embryo.
Down syndrome and Alzheimer's disease.
Down syndrome is a chromosomal disorder which is caused by the presence of extra copy of chromosome 21. Therefore also called as Trisomy 21.
Alzheimer's disease is a most common form of dementia(reduction in brain functioning). It is caused by mutation in single gene APP (Amyloid Precursor Protein) present on chromosomer 21.
.............I think its b
