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 |
Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): A typical unfertilized, angiosperm embryo sac at maturity is 8-nucleate and 7-celled.
Reason (R): The egg apparatus has 2 polar nuclei.
In the light of the above statements, choose the correct answer from the options given below:
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 Plant Kingdom comprises all the plants that have some shared characteristics. These are bacteria (prokaryotes), photosynthetic plants, fungi, and several non-photosynthetic plants.
Read Also: Two Kingdom Classification
Read More: Classification of Plants