Which gymnosperm genus possesses small, specialized roots called coralloid roots that are associated with N2-fixing cyanobacteria?
In some gymnosperms like Cycas, small specialised roots called coralloid roots are associated with N2-fixing cyanobacteria.
Question 82 of 100
📘 CLASS XI
Gymnosperms with unbranched stems include:
The stems of gymnosperms can be unbranched as in Cycas, or branched as in Pinus and Cedrus.
Question 83 of 100
📘 CLASS XI
The leaves in conifers are adapted to withstand extremes of temperature, humidity, and wind by having:
In conifers, needle-like leaves reduce the surface area, and their thick cuticle and sunken stomata help to reduce water loss, allowing them to withstand extremes of temperature, humidity, and wind.
Question 84 of 100
📘 CLASS XI
In gymnosperms, the two kinds of spores (microspores and megaspores) are produced within sporangia that are borne on spirally arranged sporophylls to form:
The two kinds of spores in gymnosperms are produced within sporangia that are borne on sporophylls arranged spirally along an axis to form lax or compact strobili or cones.
Question 85 of 100
📘 CLASS XI
Strobili bearing microsporophylls and microsporangia are called:
The strobili bearing microsporophylls and microsporangia are called microsporangiate or male strobili.
Question 86 of 100
📘 CLASS XI
The reduced male gametophyte generation in gymnosperms is known as a:
In gymnosperms, the microspores develop into a male gametophytic generation that is highly reduced and is called a pollen grain.
Question 87 of 100
📘 CLASS XI
In Cycas, unlike Pinus, the male cones and megasporophylls are:
The male or female cones or strobili may be borne on the same tree (Pinus), but in Cycas, male cones and megasporophylls are borne on different trees.
Question 88 of 100
📘 CLASS XI
In gymnosperms, the megaspore mother cell divides meiotically to form:
The megaspore mother cell in gymnosperms divides meiotically to form four megaspores.
Question 89 of 100
📘 CLASS XI
In gymnosperms, the multicellular female gametophyte is retained within the megasporangium and bears:
One of the megaspores develops into a multicellular female gametophyte that bears two or more archegonia or female sex organs, and this gametophyte is retained within the megasporangium.
Question 90 of 100
📘 CLASS XI
In gymnosperms, pollen grains are carried to the opening of the ovules by:
The pollen grain is released from the microsporangium, and they are carried in air currents to come in contact with the opening of the ovules.
