Practice free Classification of Plant Kingdom (Botany) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following groups of algae produces algin?
Alginic acid (or algin or alginate) is an anionic polysaccaride distributed widely in the cell walls of many brown algae (Phaeophyceae). It is a phycocolloid which is obtained commercially from Laminaria, Macrocystis, Nereocystis, Fucus, Sargassum etc.
Which of the following are homosporous pteridophytes?
I. Selaginella
II. Lycopodium
III. Salvinia
IV. Equisetum
Genera like Selaginella and Salvinia which produce two kinds of spores, macro (large) and micro (small) spores, are known as heterosporous pteridophytes Lycopodium and Equisetum are homosporous pteridophytes. i.e., they produce only one type of spores.
Pick the correct group consisting of all genera exhibiting homospory.
Pteridophytes, may produce similar spores (homosporous) or dissimilar spores (heterosporous). Selaginella and Salvinia show heterospory.
Read the following statements reagrding bryophytes and choose the incorrect option.
In bryophytes, zygote is the beginning of the sporophytic generation. Within venter of the archegonium, the zygote undergoes segmentation and develops without a resting period into a multicellular, undifferentiated structure called embryo. The embryo by further segmentation and differentiation finally develops into a full fledged sporophyte, called sporogonium.
In Cycas
All living species of Cycas are dioecious, i.e. male and female structures occur on separate plants. Male plant bears male strobilus or male cone, which is formed by the aggregation of microsporophylls. In female cone, the megasporophylls are loosely arranged.
Cycas is classified as a gymnosperms due to its
Cycas is classifiied as gymnosperms as it has naked ovule. Becuse of naked ovule, all gymnosperms form naked seed which differentiate them from angiosperms. Fruit and motile sperms are the common characteristics of both gymnosperms and angiosperms. Pycnoxylic wood is found in Pinus.
Elater mechanism for seed dispersal is exhibited by
In Marchantia elater mother cells give rise to elaters which helps in scattering the spore differentiated from the spore mother cells.
In Riccia and Funaria the elaters are not found. Elaters are small neutral cells in form of fibre in capsule.
What type of sorus is present in Nephrolepis?
Neprolepis sporangia arise without any order of development, therefore are called mixed type. Some species (N. acutifolia) have coenosori.
In whcih of the following groups are seeds present?
This group belongs to gymnosperms whereas Psilophya and Lycopodiophyta are pteridophytes.
Blue Green algae comes under
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Introduction
Plant Kingdom
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