Test: Gymnosperms - NEET MCQ

Coralloid roots in Cycas are associated with N2-fixing cyanobacteria.

Topic in NCERT: Gymnosperms

Line in NCERT: "while in some others (cycas) small specialised roots called coralloid roots are associated with n2- fixing cyanobacteria."

The leaves in gymnosperms, especially needle-like leaves in conifers, are adapted to reduce water loss.

Topic in NCERT: Adaptations of gymnosperms

Line in NCERT: "the leaves in gymnosperms are well-adapted to withstand extremes of temperature, humidity and wind. in conifers, the needle-like leaves reduce the surface area. their thick cuticle and sunken stomata also help to reduce water loss."

Roots in Pinus have a mycorrhizal association which helps in nutrient absorption.

Topic in NCERT: Gymnosperms

Line in NCERT: "the roots have fungal association in the form of mycorrhiza (pinus)."

In gymnosperms, the male and female gametophytes develop within the sporangia.

Topic in NCERT: Gymnosperms

Line in NCERT: "unlike bryophytes and pteridophytes, in gymnosperms the male and the female gametophytes do not have an independent free-living existence. they remain within the sporangia retained on the sporophytes."

The megaspore mother cell undergoes meiosis to form megaspores in gymnosperms.

Topic in NCERT: Gymnosperms

Line in NCERT: "the megaspore mother cell divides meiotically to form four megaspores."

Pollen grains in gymnosperms are primarily transported to the ovules by wind.

Topic in NCERT: Gymnosperms

Line in NCERT: "the pollen grain is released from the microsporangium. they are carried in air currents and come in contact with the opening of the ovules borne on megasporophylls."

Mycorrhizal roots in some gymnosperms like Pinus are associated with fungal symbionts.

Topic in NCERT: Gymnosperms

Line in NCERT: "roots in some genera have fungal association in the form of mycorrhiza (pinus)"

Needle-like leaves in conifers primarily function to reduce water loss.

Topic in NCERT: Adaptations of conifers

Line in NCERT: "in conifers, the needle-like leaves reduce the surface area. their thick cuticle and sunken stomata also help to reduce water loss."

The multicellular female gametophyte in gymnosperms develops within the megasporangium.

Topic in NCERT: Gymnosperms

Line in NCERT: "the multicellular female gametophyte is also retained within megasporangium."

The main role of the male gametophyte in gymnosperms is to produce male gametes.

Topic in NCERT: Gymnosperms

Line in NCERT: "the microspores develop into a male gametophytic generation which is highly reduced and is confined to only a limited number of cells. this reduced gametophyte is called a pollen grain."

Gymnosperms are heterosporous, producing both haploid microspores and megaspores.

Topic in NCERT: Gymnosperms

Line in NCERT: "the gymnosperms produce microspores and megaspores which are produced in microsporangia and megasporangia borne on the sporophylls."

Coralloid roots in gymnosperms like Cycas are involved in the fixation of atmospheric nitrogen.

Topic in NCERT: Gymnosperms

Line in NCERT: "small specialised roots called coralloid roots are associated with n2- fixing cyanobacteria."

The leaves of gymnosperms have a thick cuticle and sunken stomata to help reduce transpiration.

Topic in NCERT: Adaptations to reduce water loss

Line in NCERT: "their thick cuticle and sunken stomata also help to reduce water loss."

Pinus has roots that associate with mycorrhiza, which enhances nutrient absorption.