The vegetative cells of brown algae have a cellulosic wall that is usually covered on the outside by a gelatinous coating of:
The vegetative cells of Phaeophyceae have a cellulosic wall usually covered on the outside by a gelatinous coating of algin.
Question 62 of 100
📘 CLASS XI
Red algae are able to survive at great depths in oceans where relatively little light penetrates due to the predominance of:
The members of Rhodophyceae are called red algae because of the predominance of the red pigment, r-phycoerythrin, in their body, allowing them to occur at great depths in oceans where relatively little light penetrates.
Question 63 of 100
📘 CLASS XI
Which algal class is completely devoid of flagella in its life cycle?
According to the characteristics of the divisions of algae, Rhodophyceae (red algae) have an absent flagellar number, reproducing asexually by non-motile spores and sexually by non-motile gametes.
Question 64 of 100
📘 CLASS XI
Bryophytes generally occur in:
Bryophytes, which include mosses and liverworts, usually occur in damp, humid, and shaded localities, commonly growing in moist shaded areas in the hills.
Question 65 of 100
📘 CLASS XI
The main plant body of a bryophyte is:
The main plant body of the bryophyte is haploid and produces gametes, hence it is called a gametophyte.
Question 66 of 100
📘 CLASS XI
In bryophytes, the flask-shaped female sex organ that produces a single egg is known as the:
The female sex organ in bryophytes is called an archegonium, which is flask-shaped and produces a single egg.
Question 67 of 100
📘 CLASS XI
In bryophytes, the zygote does not undergo reduction division immediately, but instead produces a:
After an antherozoid fuses with the egg, the zygotes do not undergo reduction division immediately, but rather produce a multicellular body called a sporophyte.
Question 68 of 100
📘 CLASS XI
Which moss provides a substance that has long been used as fuel and as packing material for the trans-shipment of living material?
Species of Sphagnum, a moss, provide peat that has long been used as fuel, and as packing material for trans-shipment of living material because of its capacity to hold water.
Question 69 of 100
📘 CLASS XI
The plant body of a liverwort, such as Marchantia, is characterized as being:
The plant body of a liverwort is thalloid (e.g., Marchantia), with a thallus that is dorsiventral and closely appressed to the substrate.
Question 70 of 100
📘 CLASS XI
The predominant stage of the life cycle of a moss is the gametophyte, which consists of the creeping protonema stage and the upright:
The predominant stage of the life cycle of a moss is the gametophyte which consists of two stages: the first is the protonema stage, and the second is the leafy stage.
