Which classification system gave equal weightage to vegetative and sexual characteristics?
Artificial systems, such as the one given by Linnaeus, were based on a few superficial vegetative and sexual characteristics. They are not acceptable today because they gave equal weightage to both, even though vegetative characters are easily affected by the environment.
Question 2 of 100
📘 CLASS XI
Cytotaxonomy, used to resolve classification confusions, is based on:
Cytotaxonomy is based on cytological information like chromosome number, structure, and behaviour, whereas chemotaxonomy uses the chemical constituents of plants.
Question 3 of 100
📘 CLASS XI
In algae, reproduction involving the fusion of two gametes that are dissimilar in size is termed as:
Fusion of two gametes that are dissimilar in size, as seen in species of Eudorina, is termed anisogamous.
Question 4 of 100
📘 CLASS XI
Hydrocolloids (water-holding substances) such as algin and carrageen are produced respectively by:
Certain marine algae produce large amounts of hydrocolloids; algin is produced by brown algae, and carrageen is produced by red algae.
Question 5 of 100
📘 CLASS XI
Which unicellular alga is rich in proteins and used as a food supplement even by space travelers?
Chlorella, a unicellular alga rich in proteins, is used as a food supplement by space travelers.
Question 6 of 100
📘 CLASS XI
Pyrenoids, located in the chloroplasts of most green algae, contain:
Most members of Chlorophyceae have storage bodies called pyrenoids located in the chloroplasts, which contain protein besides starch.
Question 7 of 100
📘 CLASS XI
In brown algae, the vegetative plant body is usually attached to the substratum by a ________, and has a stalk called the ________ and a leaf-like photosynthetic organ called the ________.
The plant body in Phaeophyceae is usually attached to the substratum by a holdfast, and has a stalk called the stipe, and a leaf-like photosynthetic organ known as the frond.
Question 8 of 100
📘 CLASS XI
The colour of brown algae varies from olive green to various shades of brown depending on the amount of which pigment?
Brown algae vary in colour from olive green to brown depending upon the amount of the xanthophyll pigment, fucoxanthin, present in them.
Question 9 of 100
📘 CLASS XI
Floridean starch, the stored food in red algae, is structurally very similar to:
In red algae, food is stored as floridean starch which is very similar to amylopectin and glycogen in its structure.
Question 10 of 100
📘 CLASS XI
Identify the correct flagellar number and insertion for Phaeophyceae (brown algae):
Brown algae have 2 unequal flagella with lateral insertion, whereas green algae have 2-8 equal apical flagella, and red algae lack flagella entirely.
