Every question from past board papers on Plant kingdom: algae, bryophytes, pteridophytes, gymnosperms, newest paper first. Open any question for its full worked answer.
Given below are the stages in the life cycle of pteridophytes. Arrange the following stages in the correct sequence.
A. Prothallus stage
B. Meiosis in spore mother cells
C. Fertilisation
D. Formation of archegonia and antheridia in gametophyte.
E. Transfer of antherozoids to the archegonia in presence of water.
Choose the correct answer from the options given below :
The correct sequence of events in the life cycle of bryophytes is
A. Fusion of antherozoid with egg.
B. Attachment of gametophyte to substratum.
C. Reduction division to produce haploid spores.
D. Formation of sporophyte.
E. Release of antherozoids into water.
Which one of the following is the characteristic feature of gymnosperms?
Match List I with List II.
List I: A. Pteridophyte B. Bryophyte C. Angiosperm D. Gymnosperm
List II: I. Salvia II. Ginkgo III. Polytrichum IV. Salvinia
Choose the option with all correct matches.
In bryophytes, the gemmae help in which one of the following?
Read the following statements and choose the set of correct statements:
In the members of Phaeophyceae,
A. Asexual reproduction occurs usually by biflagellate zoospores.
B. Sexual reproduction is by oogamous method only.
C. Stored food is in the form of carbohydrates which is either mannitol or laminarin.
D. The major pigments found are chlorophyll a, c and carotenoids and xanthophyll.
E. Vegetative cells have a cellulosic wall, usually covered on the outside by gelatinous coating of algin.
Choose the correct answer from the options given below:
Given below are two statements : One is labelled as Assertion A and the other is labelled as 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 :
Identify the pair of heterosporous pteridophytes among the following :
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 :
Hydrocolloid carrageen is obtained from :
Which of the following is incorrectly matched ?
Match the plant with the kind of life cycle it exhibits :
List - I: (a) Spirogyra (b) Fern (c) Funaria (d) Cycas
List - II: (i) Dominant diploid sporophyte vascular plant, with highly reduced male or female gametophyte (ii) Dominant haploid free-living gametophyte (iii) Dominant diploid sporophyte alternating with reduced gametophyte called prothallus (iv) Dominant haploid leafy gametophyte alternating with partially dependent multicellular sporophyte
Gemmae are present in :
Which of the following algae produce Carrageen ?
Which of the following plants is monoecious ?
Genera like Selaginella and Salvinia produce two kinds of spores. Such plants are known as :
Which of the following algae contains mannitol as reserve food material ?
Floridean starch has structure similar to :
Which of the following pairs is of unicellular algae ?
Strobili or cones are found in :
From evolutionary point of view, retention of the female gametophyte with developing young embryo on the parent sporophyte for some time, is first observed in :
Pinus seed cannot germinate and establish without fungal association. This is because :
Which of the following statements is *correct* ?
Winged pollen grains are present in
Which one is *wrongly* matched ?
An example of colonial alga is :
Life cycle of \(\textit{Ectocarpus}\) and \(\textit{Fucus}\) respectively are :
Zygotic meiosis is characteristic of :
Select the mismatch :
Select the correct statement:
In bryophytes and pteridophytes, transport of male gametes requires :
Conifers are adapted to tolerate extreme environmental conditions because of
Which one of the following statements is wrong ?
