Statement 1: Double fertilization is a characteristic feature of angiosperms.
Statement 2: Double fertilization involves two fusions.
Both statements -1 and statement - 2 are true and statement - 2 is the correct explanation of statement - 1.
Both statements -1 and statement - 2 are true but statement - 2 is not the correct explanation of statement - 1.
Statement -1 is true and statement - 2 is false.
Statement -1 is false and statement - 2 is true.
Correct Answer :
B. Both statements -1 and statement - 2 are true but statement - 2 is not the correct explanation of statement - 1.
Double fertilization is a characteristics feature of angiosperms. It involves two fusions in which one female gamete fuses with egg cell to from zygote and the other male gamete fuses with the diploid secondary nucleus to produce the triploid primary endosperm nucleus (PEN).
Related Questions
The unique feature of bryophytes compared to other plant groups is that
they produce spores.
they lack vascular tissues.
they lack roots.
their sporophyte is attached to the gametophyte.
A universal feature of the life cycle of plants is
morphologically identical haploid and diploid stages.
genetically identical haploid and diploid stages.
alteration of generations between heteromorphic haploid gametophytes and diploid sporophytes.
none of the above
Match column-I with column-II and choose the correct option.
| Column-I | Column-II |
|---|---|
| A. Phaeophyceae | I. Have an elaborate mechanism of spore dispersal |
| B. Rhodophyceae | II. first terrestrial plant with vascular tissue-phloem and xylem |
| C. Mosses | III. Asexual reproduction by biflagellate zoosposes |
| D. Pteridophytes | IV. Polysiphonia, Porphyra, Gracilaria |
A III; B IV; C I; D II
A IV; B III; C I; D II
A IV; B III; C II; D I
A IV; B I; C III; D II
Which of the following statements (i) - (v) are correct ?
(i) In Equisetum, the female gametophyte is retained on the parent sporophyte.
(ii) In Ginkgo, male gametophyte is not independent.
(iii) The sporophyte in Riccia is more developed than that in Polytrichum.
(iv) Sexual reproduction in Volvox is isogamous.
Two
Three
Four
One
The spreading of living pteridophytes is limited and restricted to narrow geographical region because
gametophytic growth needs cool, damp and shady places.
it requires water for fertilization.
due to absence of stomata in leaf and absence of vascular tissue.
both (a) and (b)
Mosses are of great ecological importance because of
its contribution to prevent soil erosion.
its contribution in ecological succession.
its capability to remove CO from the atmosphere.
both (a) and (b)
Statement 1: Members of phaeophyceae vary in colour from olive green to various shades of brown.
Statement 2: Phaeophyceae possess chlorophyll a, c, carotenoids and xanthophylls.
Both statements -1 and statement - 2 are true and statement - 2 is the correct explanation of statement - 1.
Both statements -1 and statement - 2 are true but statement - 2 is not the correct explanation of statement - 1.
Statement -1 is true and statement - 2 is false.
Statement -1 is false and statement - 2 is true.
Statement 1: Double fertilization is a characteristic feature of angiosperms.
Statement 2: Double fertilization involves two fusions.
Both statements -1 and statement - 2 are true and statement - 2 is the correct explanation of statement - 1.
Both statements -1 and statement - 2 are true but statement - 2 is not the correct explanation of statement - 1.
Statement -1 is true and statement - 2 is false.
Statement -1 is false and statement - 2 is true.
Consider the following statements regarding the major pigments and stored food in the different groups of algae and choose the correct option
(i) In chlorophyceae, the stored food material is starch and the major pigments are chlorophyll-a and d.
(ii) In phaeophyceae, laminarian is the stored food and major pigments are chlorophyll-a and b.
(iii) In rhodophyceae, floridean starch is the stored food and the major pigments are chlorophyll-a, d and phycoerythrin.
(i) is correct, but (ii) and (iii) are incorrect
(i) and (ii) are correct, but (iii) is incorrect
(i) and (iii) are correct, but (ii) is incorrect
(iii) is correct, but (i) and (ii) are incorrect
The Natural system of classification for flowering plants was given by
Carolus Linnaeus
Bentham and Hooker
Engler and Prantl
R. H. Whittaker
Which of the following groups of plants play an important role in plant succession on bare rocks/soil ?
Algae
Bryophytes
Pteridophytes
Gymnosperms
Which of the following statements about algae is/are correct?
(i) Algae are chlorophyll bearing simple, thalloid, heterotrophic and aquatic (both fresh water and marine) organisms.
(ii) Algae reproduce by vegetative means only.
(iii) Fusion of two gametes dissimilar in size is termed as oogamous.
(iv) A few of the massive forms of algae such as kelps, form massive plant bodies.
Only (i)
Both (i) and (iii)
Only (iv)
All of these
Which of the following statements are incorrect?
Pyrenoids contain protein besides starch.
Sexual reproduction may be isogamous, oogamous and anisogamous in green and brown algae.
Some of the members of algae also occur in association with fungi (lichen) and animals (eg, on sloth bear).
The leaves in pteridophytes are well adapted to withstand extremes of temperature, humidity and wind.
Which one of the following is a correct statement?
Pteridophyte gametophyte has a protonemal and leafy stage.
In gymnosperms, female gametophyte is free-living.
Antheridiophores and archegoniophores are present in pteridophytes.
Origin of seed habit can be traced in pteridophytes.
Phylogenetic classification system is based on the
morphological characters of various organisms.
anatomical characters of various organisms.
physiological characters of various organisms.
evolutionary relationships between the various organisms.
Protonema and leafy stage are the predominant stage of the life cycle of
moss
dicots
liverwort
gymnosperm
A student was given a sample to observe under the microscope. He observed and found that the sample is the most common type of spore involved in asexual reproduction in algae. Identify the spore.
Zoospore
Endospore
Hypnospore
None of the above
Which one of the following statement concerning the algae is incorrect ?
Most algae are photosynthetic.
Algae can be classified according to their pigments.
All algae are filamentous.
Spirogyra does not produce zoospores.
Match the classes of pteridophytes given in column I with their examples given in column II and choose the correct option
| Column -I | Column-II |
|---|---|
| (Classes of pteridophytes) | (Examples) |
| A. Psilopsida | I. Selaginella |
| B. Lycopsida | II. Psilotum |
| C. Sphenopsida | III. Dryopteris |
| D. Pteropsida | IV. Equisetum |
A II; B I; C IV; D III
A I; B II; C IV; D III
A II; B I; C III; D IV
A II; B IV; C I; D III
Which of the following, examples belongs to the same class of algae?
Chara, Fucus, Polysiphonia
Volvox, Spirogyra, Chlamydomonas
Porphyra, Ectocarpus, Ulothrix
Sargassum, Laminaria, Gracilaria
Refer the following statement(s) and identify the group of plant which is being described by given statements ?
(i) They include various mosses and liverworts that are found commonly growing in moist shaded areas in the hills.
(ii) They lack true roots, stem or leaves.
(iii) The main plant body is haploid.
(iv) They produce a multicellular body sporophyte which is not free living but attached to the photosynthetic gametophyte and derives nourishment from it.
Algae
Fungi
Bryophytes
Pteridophytes
Which of the following statements with respect to gymnosperms and angiosperms is/are correct?
(i) The process of double fertilization is present in gymnosperms.
(ii) Angiosperms range in size from microscopic Wolffia to tall trees of Sequoia.
(iii) In gymnosperms, the seeds are not covered.
(iv) In gymnosperms, the male and female gametophytes have an independent free living existence. Of the above statements
(i) and (ii)
(iii) only
(ii) and (iii)
(iii) and (iv)
If there are 4 cells in anther, what will be the number of pollen grains?
8
4
16
12
Cycas and Adiantum resemble each other in having
seeds
motile sperms
cambium
vessels
Which of the following statement(s) is/are correct about angiosperms ?
(i) In angiosperms or flowering plants, the pollen grains and ovules are developed in specialised structure called flowers.
(ii) They are divided into two classes : the dicotyledons and the monocotyledons.
(iii) The male sex organ in a flower is the pistil or the carpel.
(iv) The female sex organ is the stamen.
Only (i)
Both (i) and (ii)
Both (ii) and (iv)
All of these
Bryophytes are different from fungi in having
land habit.
sterile jacket layers.
multiflagellate gametes.
gametophytic plant body.
Algin, carrageen and proteins are obtained from
red algae, brown algae, green algae respectively.
brown algae, red algae, green algae respectively.
red algae, green algae, brown algae respectively.
green algae, brown algae, red algae respectively.
Fruits are not formed in gymnosperms because of
absence of pollination.
absence of seed.
absence of fertilization.
absence of ovary.
Which of the following statement is incorrect ?
Double fertilization is unique to gymnosperms and monocotyledons.
Sequoia, a gymnosperm, is one of the tallest tree species.
Phaeophyceae members possess chlorophyll a, c, carotenoids and xanthophylls.
Moss is a gametophyte which consists of two stages namely, protonemal stage and leafy stage.
Which of the following pteridophytes belong to class pteropsida?
Equisetum and Psilotum
Lycopodium and Adiantum
Selaginella and Pteris
Pteris and Adiantum