Because it's a light colour; very few "white" objects are white. We perceive them as white because our eyes adapt.
A full answer requires going into how our eyes work, sensitometry, visual perception, aging mechanisms, and the basic physics of light. You need a library recommendation rather than a book recommendation on this one. Just accept that yellow is off white, and even white in black and white has some density in the negative unless it's a blown highlight.
Probably due to the metering. Yellow flowers in a green background is going to meter far lower than most any scene with a lot of sky within the metered area.Daffodils are a nightmare, they blow easier than a white sky.
Thanks for that, I will have a read.If you're really interested, read up on reflectance, here for example...
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Reflectance - Wikipedia
en.wikipedia.org
Then have a look at...
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Monochrome photography - Wikipedia
en.wikipedia.org
...but Stephen's answer is fine for general photographic purposes.
I did not think of that!Probably due to the metering. Yellow flowers in a green background is going to meter far lower than most any scene with a lot of sky within the metered area.