The algal class rhodophyceae contains a red pigment (r-phycocrythrin) and a blue pigment (r-phycocynin) in the chromatphores. These pigments can utilize those wavelengths of light (blue-green region of spectrum, i.e., 480-520 nm) that are not absorbed by chlorophyll. This enables red algae to grow at greater depths than other plants (upto 300 ft. below water). In addition to these, chi.-a, chl.- d, carotenes and xanthophylls are present. In phaeophyceae chromatophores are yellowish brown in colour possessing xanthophylls in abundance. Bacillariophyceae are called 'diatoms' due to presence of an accessory brown pigment called 'diatomin', other pigments are chi.-a, chi.-c (but not chi.-6), carotenes and xanthophylls. In chlorophyceae colouring pigments are just like higher plants, i.e., Chi.-a, Chi.-6, xanthophylls and carotenes.
So, the correct option is (B): rhodophyta.
S.No. | List - I | List - II | List - III |
---|---|---|---|
I | Algae | Phaeophyceae | Sargassum |
II | Bryophyta | Hepaticopsida | Marchantia |
III | Pteridophyta | Pteropsida | Equisetum |
IV | Gymnosperms | Gnetopsida | Pinus |
A sphere of radius R is cut from a larger solid sphere of radius 2R as shown in the figure. The ratio of the moment of inertia of the smaller sphere to that of the rest part of the sphere about the Y-axis is :
The current passing through the battery in the given circuit, is:
A bob of heavy mass \(m\) is suspended by a light string of length \(l\). The bob is given a horizontal velocity \(v_0\) as shown in figure. If the string gets slack at some point P making an angle \( \theta \) from the horizontal, the ratio of the speed \(v\) of the bob at point P to its initial speed \(v_0\) is :
The Plant Kingdom comprises all the plants that have some shared characteristics. These are bacteria (prokaryotes), photosynthetic plants, fungi, and several non-photosynthetic plants.
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