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Affinities of Anthoceros with other members.

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Affinities of Anthoceros with other members. Anthoceros shows affinity with algae, members of Hepticopsida and Bryopsida of Bryophyta and Pteridophyta.The affinity and relationship of Anthoceros with green algae lies in the presence of a single large chloroplast together with a pyrenoid in cach cell of the gametophyte and in the formation of biciliated sperms. Anthoceros shows affinity with members of Hepaticopsida such as Riccia, Marchantia, etc. in the construction and structure of sex organs and in the apical growth of the thallus.It has affinity with members of Bryopsida i.e. Polytrichum, in the structure such as presence of columella, reduction of sporogenous tissue etc. and development of sporogonium. The spore production from amphithecium resembles the condition of that in Sphagnum. Anthoceros also shows sunken archegonium and development of antheridium from hypodermal initial cell like Pteridophyta. Highly developed sporophyte having photosynthetic tissue, functional stomata, i...
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Biological Science Practice SET

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  1. Evolutionary homology is similarity due to common ancestry. Which of the following characters are evolutionary homologies? a) wing of a bird and a bat b) beak of a vulture and an eagle c) fin of a fish and a whale d) webbed feet of a duck and a frog   2. Locus   A in a diploid   organism has two alleles A 1 and A 2 , where A1 is dominant over A 2 . Additionally A 2   is deleterious in the homozygous condition. Allele A 2 takes a long time to get eliminated from the population because a) A 1 is harbored in the heterozygotes b) A 1 is harbored in the homozygotes c) A 2 is harbored in the heterozygotes d) A 2 is harbored in the homozygotes   3. In a population of 100 diploid individuals, the frequency of neutral alleles A 1 and A 2 are 0.4 and 0.6 respectively. Assuming Hardy-Weinberg equilibrium and no change in population size, the frequency of heterozygotes after five generations is: a) 0.36     ...
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BIOLOGICAL SCIENCE MCQ 13.07.2021 Practice set

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  BIOLOGICAL SCIENCE MCQ  13.07.2021 Practice set 1. All eukaryotic unicellular organisms belong to a. Monera b. Protista c. Fungi d. Bacteria 2. The five kingdom classification was proposed by a. R.H. Whittaker b. C.Linnaeus c. A. Roxberg d. Virchow 3. Organisms living in salty areas are called as a. Methanogens b. Halophiles c. Heliophytes d. Thermoacidophiles 4. Naked cytoplasm, multinucleated and saprophytic are the characteristics of a. Monera b. Protista c. Fungi d. Slime molds 5. An association between roots of higher plants and fungi is called a. Lichen b. Fern c. Mycorrhiza d. BGA 6. A dikaryon is formed when a. Meiosis is arrested b. The two haploid cells do not fuse immediately c. Cytoplasm does not fuse d. None of the above 7. Contagium vivum fluidum was proposed by a. D.J. Ivanowsky b. M.W. Beijerinek c. Stanley d. Robert Hook 8. Mycobiont and Phycobiont are found in a. Mycorrhiza b. Root c. Lichens d. BGA 9. Difference between Virus and Viroid is a. Absence of pr...
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MCQ BIOLOGY BIOMOLECULES 12.07.2021

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  1.The mature erythrocyte contains a) Cytochromes                          b) TCA – enzymes c) Pyruvic kinase                        d) ATP – ase 2. Hemoglobin is responsible for what percentage of carbondioxide transport by the blood ? a) 90                    b) 50                    c) 10                    d) 5 3. Christmas factor is synonymous with a) Proconvertin                 ...
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