In angiosperms, the seed coat is formed from ________.
In angiosperms, the seed coat is formed from ovule.
Blue-green algae belong to
Blue green algae or cyanobacteria come under Prokaryotes. Prokaryotes lack a well defined nucleus surrounded by nuclear membrane. Eukaryotes have well organised nucleus. Rhodophyceae & Chlorophyceae are members of algae which come under eukaryotes.
Tallest angiosperm is
Tallest angiospermic plant is Eucalyptus but the tallest plants of all category is red wood tree(Sequoia) - a member of gymnosperm.
In plants, which of the following can divide by meiotic cell division?
In plants, meiotic cell division occurs in pollen mother cell.
How gametes are produced in haploid plants?
Mitosis helps in the formation of gametes in haploid plants.
Which of the following plays a vital role during sexual reproduction in Bryophytes?
Water plays a vital role in the sexual reproduction of Bryophytes. The antherozoids are released into water which helps the antherozoids to contact the archegonium.
Which of the following is the filamentous alga?
Ulothrix is the filamentous alga. Chlamydomonas is a microscopic alga, and the Volvox is in the colonial form.
Which of the following statements is true regarding pteridophytes?
In pteridophytes, the sporophyte and gametophyte are independent.
Algae used in space programme is :
Chlorella is an algae which is used by space travellers as food. This algae belonging to chlorophyceae is rich in proteins and is used as a food supplement.
Female reproductive part of bryophytes is
Female sex organ is called archegonium which is flask shaped with a tubular neck and a swollen center.
Brown algae is characterised by the presence of
Phycoerythrins are accessory photosynthetic pigments along with phycocyanins. Haematochrome is a pigment in the blood. Brown algae is brown due to fucoxanthin.
How does liverwort reproduce asexually?
During asexual reproduction, liverwort produce a specialized structure called gemmae which detach from the parent body and germinate to form new individual.
Which of the following is the dominant generation in gymnosperms?
In gymnospersm, the sporophyte generation is the dominant generation.
If you are asked to classify the various algae into distinct groups, which of the following characters you should choose?
It will be types of pigment present in the cell like Rhodophyceae shows presence of phycoerythrin , chlorophyceae shows presence of phycocyanin, etc.
Which of the following is required for the fertilization in pteridophytes?
Water is required for the transfer of antherozoids (the male gametes) from the antheridia to the mouth of archegonium.
The main plant body of the bryophyte is ___.
The main plant body of the bryophyte is haploid.
_________ is the fusion of two dissimilar size gametes.
Anisogamous is the fusion of two dissimilar size gametes.
Which of the following cannot fix nitrogen?
Spirogyra is a member of green algae which cannot fix atmospheric nitrogen. Only Nostoc and Anabaena (Blue green algae) and Azotobacter (bacteria) can fix nitrogen.
Common characteristic between bryophytes and pteridophytes is
Require water for fertilization as their sperms are motile.
How do angiosperms differ from mosses and ferns?
Angiosperms have true leaves, stems, and roots and thus differ from mosses and ferns.
Dichotomous branching is found in
In mosses branching is lateral but extra-axillary (Funaria). Marchantia is a dorsiventral dichotomously branched thalloid liverwort. In Sphagnum branching is profuse.
Cycas have two cotyledons but not included in angiosperms because of
In Cycas (gymnosperm) the seed does not occur inside a fruit but lies naked or exposed on the surface of megasporophyll.
Which one of the following is a living fossil?
Ginkgophyta is an ancient group of with the sole living representative of living fossil is Ginkgo biloba or Maiden hair tree, which is native of South China.
Moss peristome takes part in
Peristomes are teeth present in the capsule of moss. These are in two rows and helps in the dispersal of the spores due to hygroscopic nature.
In gymnosperms like Pinus and Cycas, the endosperm is
In gymnosperm like Cycas/Pinus, endosperms of female gametophyte is haploid and formed before fertilization.
Bryophytes are of
They are called pollution indicators. They prevent soil erosion by running water.
Agar is commercially obtained from
The Agar is obtained from several members of red algae such as Gracilaria, Gelidium, Chondrus etc. Agar gels are extensiely used for growing micro-organisms.
Laminaria (kelp) and Fucus (rock weed) are the examples of
Laminaria (kelp) and Fucus (rock weed) are marine algae. They are the members of class-phaeophyceae (brown algae).
Algae have cell wall made up of :
Algae possess a definite cell wall containing cellulose, galactans and mannans.
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