Yes, white flowers may contain pigments but lack coloured pigments. They reflect all light, appearing white. Sometimes, absence of pigment also causes the white colour in flowers.
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Vacuoles store water, nutrients and waste materials in cells. In plant cells, large vacuoles maintain pressure and keep the cell firm, helping plants stay upright.
Yes, chromoplasts are plastids that contain pigments other than green chlorophyll. They give yellow orange or red colours to different plant parts like fruits and flowers.
Cells use lysosomes to break down waste materials and damaged organelles. These enzymes digest unwanted substances, preventing accumulation and keeping the cell clean and functioning properly.
Yes, mature red blood cells in humans lack a nucleus. This helps them carry more oxygen. Some other specialised cells may also lose their nucleus to perform specific functions efficiently.