Natural classification systems for flowering plants, which considered both external and internal features, were given by:
A natural classification system for flowering plants, which was based on natural affinities among organisms and considered internal features like ultra-structure, anatomy, embryology, and phytochemistry, was given by George Bentham and Joseph Dalton Hooker.
Question 52 of 100
📘 CLASS XI
Numerical Taxonomy, which is easily carried out using computers, ensures that:
Numerical Taxonomy is based on all observable characteristics, assigning numbers and codes to all characters so that data can be processed by computers. In this way, each character is given equal importance, and hundreds of characters can be considered at the same time.
Question 53 of 100
📘 CLASS XI
Which of the following represents a colonial form of algae?
The form and size of algae is highly variable, ranging from colonial forms like Volvox and filamentous forms like Ulothrix and Spirogyra.
Question 54 of 100
📘 CLASS XI
The most common type of asexual spore produced by algae is the:
Asexual reproduction in algae is by the production of different types of spores, the most common being the zoospores, which are flagellated (motile) and give rise to new plants on germination.
Question 55 of 100
📘 CLASS XI
Sexual reproduction involving non-flagellated (non-motile) gametes that are similar in size occurs in:
Fusion of two gametes that are non-flagellated (non-motile) but similar in size is a form of isogamous reproduction seen in Spirogyra.
Question 56 of 100
📘 CLASS XI
Ecologically, algae are of paramount importance because they are:
Algae are of paramount importance as primary producers of energy-rich compounds which form the basis of the food cycles of all aquatic animals.
Question 57 of 100
📘 CLASS XI
In Chlorophyceae, the chloroplasts can be shaped like:
The pigments in green algae are localised in definite chloroplasts, which may be discoid, plate-like, reticulate, cup-shaped, spiral, or ribbon-shaped in different species.
Question 58 of 100
📘 CLASS XI
What is the characteristic flagellar number and position of insertions for green algae (Chlorophyceae)?
Members of Chlorophyceae have 2-8 equal, apical flagella, whereas brown algae have 2 unequal lateral flagella and red algae lack flagella.
Question 59 of 100
📘 CLASS XI
Brown algae (Phaeophyceae) possess which of the following major pigments?
The members of Phaeophyceae possess chlorophyll a, c, carotenoids, and xanthophylls.
Question 60 of 100
📘 CLASS XI
In brown algae, food is primarily stored as complex carbohydrates in the form of:
In brown algae, food is stored as complex carbohydrates, which may be in the form of laminarin or mannitol.
