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.
Correct Answer :
A. Both statements -1 and statement - 2 are true and statement - 2 is the correct explanation of statement - 1.
Phaeophyceae possesses chlorophyll a, c, carotenoids and xanthophylls. Members of phaeophyceae show variations in colour from olive green to different shades of brown depending upon the amount of the xanthophyll pigments.
Related Questions
The following statements are associated with one class of algae. Identify the class of algae.
(i) One or more storage bodies called pyrenoids located in the chloroplasts are present in the members of this class.
(ii) They have a rigid cell wall made of an inner layer of cellulose and an outer layer of pectose.
(iii) Asexual reproduction is by flagellated zoospores produced in zoosporangia.
(iv) Chlamydomonas, Volvox, Ulothrix, Spirogyra and Chara are commonly found members of this class.
Chlorophyceae
Rhodophyceae
Phaeophyceae
None of these
Which of the following statement(s) is/are correct about gemmae ?
(i) These are specialised structures by which asexual reproduction take place in liverworts.
(ii) They are green, multicellular and asexual buds.
(iii) They develop in small receptacles called gemma cups.
(iv) They detach from parent body and germinate to form new individuals.
(i) and (ii)
(ii) and (iii)
(i), (ii) and (iii)
All of these
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
Read the following statements and choose the correct option.
(i) In rhodophyceae, food is stored in the form of mannitol and laminarin.
(ii) The ovules of gymnosperms are not enclosed by ovary wall.
(iii) Salvinia is heterosporous.
(iv) In the diplontic life-cycle, the free living gametophyte represents the dominant phase.
(ii) and (iii) are correct but (i) and (iv) are incorrect.
(ii) and (iv) are correct but (i) and (iii) are incorrect.
(iii) and (iv) are correct but (i) and (ii) are incorrect.
(i) and (ii) are correct but (iii) and (iv) are incorrect.
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 statement(s) is/are correct ?
(i) Agar, one of commercial products obtained from Laminaria and Sargassum are used to grow microbes and in preparations of ice-creams and jellies.
(ii) In phaeophyceae, major pigments are chl a, d and phycoerythrin.
(iii) Pteridophytes classified into four classes : Psilopsida, Lycopsida, Sphenopsida and Pteropsida.
(iv) Gemmae are green, multicellular, asexual buds, which develop in small receptacles called gemma cups located on the thalli.
Both (i) and (ii)
Both (ii) and (iv)
Both (iii) and (iv)
All of these
Angiosperms have dominated the land flora primarily because of their
power of adaptability in diverse habitat.
property of producing large number of seeds.
nature of self pollination.
domestication of man.
Match the column-I with column-II and choose the correct option.
| Column-I | Column-II |
|---|---|
| (System of classification) | (Characteristics) |
| A. Artificial system | I. Based on few morphological of classification characters |
| B. Natural system | II. Based on evolutionary of classification relationships between the various organisms |
| C. Phylogenetic | III. Based on natural affinities system of among the organisms and classification consider external as well as internal features. |
A II; B I; C III
A I; B III; C II
A III; B II; C I
A I; B II; C III
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)
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
You are given an unknown plant to study in the laboratory. You find that it has chlorophyll, no xylem. Its multicellullar sex organs are enclosed in a layer of jacket cells. Its gametophyte stage is free living. The plant probabily belongs to
chlorophyceae
bryophyte
pteridophyte
gymnosperm
In angiosperms, a mature male gametophyte is derived from a pollen mother cell by
three mitotic divisions.
one meiotic and two mitotic divisions.
two meiotic divisions.
a single meiotic division.
Fusion of two gametes which are dissimilar in size is termed as _______.
isogamous
oogamous
anisogamous
agamous
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.
Which of the following statement(s) is/are correct about pteridophytes ?
(i) The main plant body is a sporophyte which is differentiated into true roots and leaves.
(ii) The leaves are small (microphylls) as in ferns or large (macrophylls) as in Selaginella.
(iii) Genera like Selaginella and Salvinia which produce two kinds of sporesmacro (large) and micro (small) spores, are known as heterospores.
(iv) Common examples are Funaria, Polytrichum and Sphagnum.
Both (i) and (ii)
Both (ii) and (iii)
Both (i) and (iii)
All of these
Which of the following statements with respect to algae are correct.
(i) Fusion between one large, non-motile female gamete and a smaller, motile male gamete is termed as oogamous.
(ii) Fusion of two gametes dissimilar in size is termed as oogamous.
(iii) Fusion of two gametes similar in size is called anisogamous.
(iv) In chlorophyceae, the major pigments are chlorophyll a and b , and the food is stored as starch.
(v) In rhodophyceae, the major pigments are chlorophyll a and d , and the food is stored as mannitol.
(i) and (v)
(iii) and (v)
(i) and (ii)
(i) and (iv)
Refer the statement and answer the question. They usually reproduce vegetatively by fragmentation and asexually by non - motile spores and sexually by non - motile gametes.
Identify the group of plants and its example.
Mosses, Funaria
Red algae, Polysiphonia
Brown algae, Laminaria
Pteridophytes, Selaginella
Fern plant is a
haploid gametophyte
diploid gametophyte
diploid sporophyte
haploid sporophyte
What is common in all the three, Funaria, Dryopteris and Ginkgo?
Independent sporophyte
Presence of archegonia
Well developed vascular tissues
Independent gametophyte
Match column-I with column-II and choose the correct option.
| Column-I | Column-II |
|---|---|
| A. Agar | I. Single cell protein, used as food supplements by space travellers |
| B. Algin | II. Red algae |
| C. Carrageen | III. Brown algae |
| D. Chlorella | IV. Gelidium, Gracilaria Spirullina |
A I; B II; C III; D IV
A IV; B III; C II; D I
A II; B I; C III; D IV
A III; B II; C I; D IV
Moss peat is used as a packing material for sending flowers and live plants to distant places because
it reduces transpiration.
it serves as a disinfectant.
it is easily available.
it is hygroscopic.
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 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.
If the cells of root in wheat plant have 42 chromosomes, then the no. of chromosome in the cell of pollen grain is
14
21
28
42
Protonema and leafy stage are the predominant stage of the life cycle of
moss
dicots
liverwort
gymnosperm
Laminaria (Kelp) and Fucus (Rock weed) are examples of
green algae
brown algae
red algae
golden brown algae
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.
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.
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.