Question asked by Filo student

Write the answer in one sentence each :- $1\times 7=7$

1. How many nucleus and cells are found in a typical angiosperm embryo sac.
2. Into which sex the zygote develops when it contains $XX$ chromosomes after fertilization?
3. In Down syndrome trisomy occurs at which chromosome number?
4. Write the full name of nucleic acid R.N.A.
5. Write the name of one cyanobacteria which is used as biofertilizer.
6. What is the name given for symbiotic association between fungi and roots of higher level plants?
7. What percentage of energy flows through each trophic level in ecosystem ?

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