Which of the following characteristics helps gymnosperms survive in cold and dry regions?
They have needle-like or scale-like leaves that reduce water loss.
Gymnosperms are seed plants whose seeds are naked, that is, not enclosed in a fruit; common examples are pine, deodar, fir, spruce and Cycas. Many conifers grow in cold, high-altitude or dry regions.
Most conifers have needle-like or scale-like leaves with a small surface area, a thick waxy cuticle and sunken stomata. These features reduce transpiration, so the plant loses very little water when water is scarce or the soil is frozen; the needle shape also helps snow slide off.
Gymnosperms do not produce flowers at all; they bear cones, and their pollen is mostly carried by wind, so bright, colourful flowers to attract insects are a feature of angiosperms.
They are land plants that do not depend on aquatic habitats for reproduction, and large, broad leaves that increase water loss would be a disadvantage, not a help, in cold and dry regions.
Hence, They have needle-like or scale-like leaves that reduce water loss.
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Which of the following is a type of nutrition?
I. Heterotrophic
II. Autotrophic
Part of N 2cycle that is opposed to N 2fixation is:
Which among the following is the reproductive part of a plant?
Fibres (Adventitious) roots are found in :
In which Part of the flower does Meiosis take place ?
