What is the relationship between a chromosome and dna?
a.
chromosomes are made of dna.
b.
dna is made of chromosomes.
c.
dna manufactures chromosomes.
d.
chromosomes manufacture dna.

The correct answer is-

A.  Chromosomes are made of DNA.

Chromosome can be described as the thread like structure that is made up of the chemical substance DNA ( deoxyribonucleic acid). When DNA is tightly packed and wrapped around proteins called histones, it form a structure in a threadlike form called chromosome.

On the other hand, DNA is considered as the genetic material of living organisms.

It is made up of small units called nucleotides. A nucleotide is hat is composed of -

1)nitrogenous base, which can be Adenine, Thymine, Guanine, Cytosine .

2) Phosphate group, and 3) Deoxyribose sugar ( pentose sugar).

Thus, option A.  Chromosomes are made of DNA. is the right answer.

one part of the electromagnetic spectrum that arrives on earth as solar radiation from the sun is the visible spectrum. wavelengths of the visible spectrum combine to form what we refer to as

answer - d) ultraviolet radiation.

violet /   380–450 nm / 668–789 thz

violet is number 1 in the chart of visible light.

1)

i))the process of preparing food by green plants in the presence of sunlight is called photosynthesis.

ii) leaf is the site for photosynthesis.

iii) it takes place as,

6h2o+6co2=c6h12o6+602