In angiosperms, the specialized structures where pollen grains and ovules develop are called:
In the angiosperms or flowering plants, the pollen grains and ovules are developed in specialised structures called flowers.
Question 92 of 100
📘 CLASS XI
The angiosperms are an exceptionally large group of plants divided into two classes known as:
Angiosperms are divided into two classes: the dicotyledons and the monocotyledons.
Question 93 of 100
📘 CLASS XI
The smallest known angiosperm is:
Angiosperms range in size from the smallest Wolffia to tall trees of Eucalyptus.
Question 94 of 100
📘 CLASS XI
A characteristic feature of angiosperms that sets them apart from gymnosperms is that their seeds are:
Unlike gymnosperms where the ovules are naked, in angiosperms, the seeds are enclosed in fruits.
Question 95 of 100
📘 CLASS XI
Mosses prevent soil erosion primarily because:
Since mosses form dense mats on the soil, they reduce the impact of falling rain and prevent soil erosion.
Question 96 of 100
📘 CLASS XI
In pteridophytes, the sporangia are subtended by leaf-like appendages called:
In pteridophytes, the sporophytes bear sporangia that are subtended by leaf-like appendages called sporophylls.
Question 97 of 100
📘 CLASS XI
The giant redwood tree Sequoia, one of the tallest tree species in the world, belongs to which plant group?
One of the gymnosperms, the giant redwood tree Sequoia, is one of the tallest tree species.
Question 98 of 100
📘 CLASS XI
Which stage represents the haploid, gamete-producing phase in the plant life cycle?
The main plant body of a bryophyte (and the equivalent phase in other plants) is haploid and produces gametes, hence it is called a gametophyte.
Question 99 of 100
📘 CLASS XI
Gelidium and Gracilaria, which are used to commercially produce agar, belong to which class of algae?
Agar is a commercial product obtained from Gelidium and Gracilaria, which are common members of the red algae (Rhodophyceae).
Question 100 of 100
📘 CLASS XI
Which of the following pairs of plant organisms and their characteristic forms/features is INCORRECTLY matched?
The form and size of algae is highly variable, and Volvox represents a colonial form of green algae, not a filamentous one. The filamentous forms of green algae are instead represented by organisms like Ulothrix and Spirogyra. All the other options are correctly matched: Ectocarpus represents the simple, branched, filamentous forms of brown algae, Sphagnum is a moss that provides peat used as fuel and packing material, and Polysiphonia is a red alga, which characteristically stores food as floridean starch.
