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With respect to metaphase, which of the following statements is incorrect?
Select the correct statements regarding cell division stages.
Which, among the following, are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen?
Select the correct combination of the statements (A-D) regarding the characteristics of certain organisms: (A) Methanogens are archaebacteria which produce methane in marshy areas. (B) Nostoc is a filamentous blue–green algae which fixes atmospheric nitrogen. (C) Chemosynthetic autotrophic bacteria synthesize cellulose from glucose. (D) Mycoplasma lack a cell wall and can survive without oxygen.
In the five-kingdom classification, Chlamydomonas and Chlorella have been included in:
<p data-path-to-node="2" style="white-space: normal; caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><b data-path-to-node="2" data-index-in-node="0">Match the specific cell cycle phases in Column-I with their corresponding events or characteristics in Column-II.</b></p><div class="horizontal-scroll-wrapper" style="white-space: normal; caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><div class="table-block-component"><response-element class="" ng-version="0.0.0-PLACEHOLDER"><table-block _nghost-ng-c647008323="" class="ng-star-inserted"><div _ngcontent-ng-c647008323="" class="table-block has-export-button"><div _ngcontent-ng-c647008323="" not-end-of-paragraph="" class="table-content not-end-of-paragraph" jslog="275421;track:impression,attention" data-hveid="0" decode-data-ved="1" data-ved="0CAAQ3ecQahcKEwjuzcLGltKSAxUAAAAAHQAAAAAQXg"><table data-path-to-node="3"><thead><tr><td><span data-path-to-node="3,0,0,0">Column-I (Phase)</span></td><td><span data-path-to-node="3,0,1,0">Column-II (Event/Characteristic)</span></td></tr></thead><tbody><tr><td><span data-path-to-node="3,1,0,0"><b data-path-to-node="3,1,0,0" data-index-in-node="0">A.</b> G1 Phase</span></td><td><span data-path-to-node="3,1,1,0"><b data-path-to-node="3,1,1,0" data-index-in-node="0">1.</b> DNA replication occurs and centriole duplicates in the cytoplasm.</span></td></tr><tr><td><span data-path-to-node="3,2,0,0"><b data-path-to-node="3,2,0,0" data-index-in-node="0">B.</b> S Phase</span></td><td><span data-path-to-node="3,2,1,0"><b data-path-to-node="3,2,1,0" data-index-in-node="0">2.</b> Proteins are synthesized in preparation for mitosis while cell growth continues.</span></td></tr><tr><td><span data-path-to-node="3,3,0,0"><b data-path-to-node="3,3,0,0" data-index-in-node="0">C.</b> G2 Phase</span></td><td><span data-path-to-node="3,3,1,0"><b data-path-to-node="3,3,1,0" data-index-in-node="0">3.</b> Cells remain metabolically active but do not proliferate (Quiescent Stage).</span></td></tr><tr><td><span data-path-to-node="3,4,0,0"><b data-path-to-node="3,4,0,0" data-index-in-node="0">D.</b> G0 Phase</span></td><td><span data-path-to-node="3,4,1,0"><b data-path-to-node="3,4,1,0" data-index-in-node="0">4.</b> Cell is metabolically active and grows continuously but does not replicate DNA.</span></td></tr></tbody></table></div></div></table-block></response-element></div></div>
Virus envelope is known as:
Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R): Assertion (A): In gymnosperms, the pollen grains are released from the microsporangium and carried by air currents. Reason (R): Air currents carry the pollen grains to the mouth of the archegonia where the male gametes are discharged and pollen tube is not formed. In the light of the above statements, choose the correct answer from the options given below:
Given below are two statements: Statement I: In C3 plants, some O2 binds to RuBisCO, hence CO2 fixation is decreased. Statement II: In C4 plants, mesophyll cells show very little photorespiration while bundle sheath cells do not show photorespiration. In the light of the above statements, choose the correct answer from the option given below:
In Kranz anatomy, the bundle sheath cells have:
Which one single organism or the pair of organisms is correctly assigned to its or their named taxonomic group?
How many molecules of ATP and NADPH are required for every molecule of CO2 fixed in the Calvin cycle?
Given are the following five statements (I - V) for your consideration: I: In Equisetum, the female gametophyte is retained on the parent sporophyte II: In Ginkgo, the male gametophyte is not independent III: The sporophyte in Marchantia is more developed than that in Polytrichum IV: Sexual reproduction in Volvox is isogamous V: The spores of slime moulds lack cell walls How many of the above statements is/are correct?
Selaginella and Salvinia are considered to represent a significant step towards the evolution of seed habit because:
Given below are two statements : One is labelled as Assertion (A) and the other is labelled Reason (R): Assertion (A): The first stage of gametophyte in the life cycle of moss is protonema stage. Reason (R): Protonema develops directly from spores produced in capsule. In the light of the above statements, choose the most appropriate answer from the options given below:
In a moss the sporophyte:
Read the following five statements (I to V) and select the option with all correct statements. I: Mosses and lichens are the first organisms to colonise bare rock. II: Selaginella is a homosporous pteridophyte. III: Coralloid roots in Cycas have VAM. IV: Main plant body in bryophytes is gametophytic, whereas in pteridophytes it is sporophytic. V: In gymnosperms, male and female gametophytes are present within sporangia located on sporophytes.
Examine the figure given below and select the right option giving all the four parts (A, B, C and D) correctly identified:
Match List-I with List-II List-I (A) Pteropsida (B) Lycopsida (C) Psilopsida (D) Sphenopsida List-II (I) Psilotum (II) Equisetum (III) Adiantum (IV) Selaginella Choose the correct answer from the options given below:
Two identical bar magnets are fixed with their centres at a distance $d$ apart. A stationary charge $Q$ is placed at $P$ in between the gap of the two magnets at a distance $D$ from the centre $O$ as shown in the figure. The force on the charge $Q$ is: