Home
Current Affairs January 2024

What is the correct answer?

4

Which of the following class of algae is mostly found in salt water ?

A. Phaeophyceae

B. Rhodophyceae

C. Chlorophyceae

D. Both (a) and (b)

Correct Answer :

B. Rhodophyceae


Rhodophyceae are commonly called as red algae because of the predominance of the red pigment (r - phycoerythrin) in their body. They are mostly found in salt water.

Related Questions

What is the correct answer?

4

Fruits are not formed in gymnosperms because of

A. absence of pollination.

B. absence of seed.

C. absence of fertilization.

D. absence of ovary.

What is the correct answer?

4

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.

A. Algae

B. Fungi

C. Bryophytes

D. Pteridophytes

What is the correct answer?

4

Moss peat is used as a packing material for sending flowers and live plants to distant places because

A. it reduces transpiration.

B. it serves as a disinfectant.

C. it is easily available.

D. it is hygroscopic.

What is the correct answer?

4

Which of the following pteridophytes belong to class pteropsida?

A. Equisetum and Psilotum

B. Lycopodium and Adiantum

C. Selaginella and Pteris

D. Pteris and Adiantum

What is the correct answer?

4

Match column-I with column-II and choose the correct option.
Column-IColumn-II
A. Amphibian of theI. Sphagnum plant kingdom
B. Specialized structuresII. Angiosperms in liverworts for asexual reproduction
C. Monocotyledons andIII. Bryophytes dicotyledons
D. A plant which hasIV. Gemmae capacity to holding water

A. A III; B IV; C I; D II

B. A III; B IV; C II; D I

C. A IV; B III; C II; D I

D. A III; B II; C IV; D I

What is the correct answer?

4

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.

A. (i) and (ii)

B. (ii) and (iii)

C. (i), (ii) and (iii)

D. All of these

What is the correct answer?

4

In class phaeophyceae, the plant body is usually attached to the substratum by a A and has a stalk, the B and leaf like photosynthetic organ-the C .

A. A holdfast, B stipe, C frond

B. A stipe, B holdfast, C frond

C. A frond, B stipe, C holdfast

D. A stipe, B frond, C holdfast

What is the correct answer?

4

Which of the following, examples belongs to the same class of algae?

A. Chara, Fucus, Polysiphonia

B. Volvox, Spirogyra, Chlamydomonas

C. Porphyra, Ectocarpus, Ulothrix

D. Sargassum, Laminaria, Gracilaria

What is the correct answer?

4

Match column-I with column-II and choose the correct option.
Column-IColumn-II
A. PhaeophyceaeI. Have an elaborate mechanism of spore dispersal
B. RhodophyceaeII. first terrestrial plant with vascular tissue-phloem and xylem
C. MossesIII. Asexual reproduction by biflagellate zoosposes
D. PteridophytesIV. Polysiphonia, Porphyra, Gracilaria

A. A III; B IV; C I; D II

B. A IV; B III; C I; D II

C. A IV; B III; C II; D I

D. A IV; B I; C III; D II

What is the correct answer?

4

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.

A. (i) and (v)

B. (iii) and (v)

C. (i) and (ii)

D. (i) and (iv)

What is the correct answer?

4

Laminaria (Kelp) and Fucus (Rock weed) are examples of

A. green algae

B. brown algae

C. red algae

D. golden brown algae

What is the correct answer?

4

Place the following groups of plants in order, beginning with those that first appeared on the earth and progressing toward those that appeared most recently in time.

A. Gymnosperms, angiosperms, ferns, moss, algae

B. Algae, moss, ferns, gymnosperms, angiosperms

C. Moss, algae, ferns, angiosperms, gymnosperms

D. Algae, ferns, angiosperms, gymnosperms, moss

What is the correct answer?

4

Read the following statements and answer the question.
(i) Sporophytic generation is represented only by the one-celled zygote.
(ii) Meiosis in the zygote results in the formation of haploid spores.
(iii) The dominant, photosynthetic phase in such plants is free-living gametophyte.
(iv) Many algae such as Volvox, Spirogyra and some species of Chlamydomonas represent this pattern.
Which of the following pattern of life cycle of plant is described by the above statements ?

A. Haplontic

B. Diplontic

C. Haplo-diplontic

D. None of these

What is the correct answer?

4

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.

A. Only (i)

B. Both (i) and (ii)

C. Both (ii) and (iv)

D. All of these

What is the correct answer?

4

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.

A. Mosses, Funaria

B. Red algae, Polysiphonia

C. Brown algae, Laminaria

D. Pteridophytes, Selaginella

What is the correct answer?

4

Classification of plants proposed by Carolus Linnaeus was artificial because it was based on

A. only a few morphological characters.

B. evolutionary tendencies which are diverse.

C. anatomical characters which are adaptive in nature.

D. physiological traits alongwith morphological characters.

What is the correct answer?

4

Which one of the following term is correctly matched with their definition in Pinus ?

A. Monoecious Male (microsporangiate) and female (megasporangiate) cones are produced on same plant.

B. Monoecious Male and female sporophylls borne on same strobilus.

C. Dioecious Male and female cones are produced on different plants.

D. Monoecious Micro and megasporocarp develop on same plant.

What is the correct answer?

4

Which of the following group of plant is being described by given statements ?
(i) The plant body is thalloid.
(ii) Asexual reproduction takes place by fragmentation of thalli, or by the formation of specialized structures called gemmae.
(iii) The sporophyte is differentiated into a foot, seta and capsule.
(iv) They grow usually in moist and shady habitats.

A. Liverworts

B. Moss

C. Fern

D. Gymnosperm

What is the correct answer?

4

Which of the following class of algae is rarely found in fresh water ?

A. Chlorophyceae

B. Phaeophyceae

C. Rhodophyceae

D. Both (a) and (b)

What is the correct answer?

4

In order to colonize land, plants needed to acquire which of the following characteristics?

A. A mechanism for moving water throughout the plant.

B. A mechanism to prevent desiccation of tissues.

C. An ability to screen ultraviolet radiation.

D. Both (b) and (c)

What is the correct answer?

4

A research student collected certain alga and found that its cells contained both chlorophyll a and chlorophyll d as well as phycoerythrin on the basis of his observation the students conclude that the alga belongs to

A. rhodophyceae

B. bacillariophyceae

C. chlorophyceae

D. phaeophyceae

What is the correct answer?

4

Deep in the tropical rain forest, a botanist discovered an unusual plant with vascular tissues, stomata, a cuticle, flagellated sperm, conelike reproductive structures bearing seeds, and an alternation-of-generations life cycle. He was very excited about this discovery because it would be rather unusual for a plant to have both

A. a cuticle and flagellated sperm.

B. vascular tissues and alternation of generations.

C. seeds and flagellated sperm.

D. alternation of generations and seeds.

What is the correct answer?

4

Cycas and Adiantum resemble each other in having

A. seeds

B. motile sperms

C. cambium

D. vessels

What is the correct answer?

4

Match the column I with column II and choose the option which shows its correct combination.
Column-IColumn-II
(Pattern of life cycle in plant)(Examples)
A. HaplonticI. Bryophytes, Pteridophytes, life cycle Ectocarpus, Polysiphonia, Kelps
B. DiplonticII. Seed bearing plants life cycle (Gymnosperm and Angiosperm), Fucus
C. Haplo-diplonticIII. Many algae (Volvox, life cycle Spirogyra) and some species of Chlamydomonas

A. A III; B II; C I

B. A I; B II; C III

C. A II; B I; C III

D. A III; B I; C II

What is the correct answer?

4

Which one of the following is a correct statement?

A. Pteridophyte gametophyte has a protonemal and leafy stage.

B. In gymnosperms, female gametophyte is free-living.

C. Antheridiophores and archegoniophores are present in pteridophytes.

D. Origin of seed habit can be traced in pteridophytes.

What is the correct answer?

4

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.

A. Both (i) and (ii)

B. Both (ii) and (iv)

C. Both (iii) and (iv)

D. All of these

What is the correct answer?

4

Fern plant is a

A. haploid gametophyte

B. diploid gametophyte

C. diploid sporophyte

D. haploid sporophyte

What is the correct answer?

4

Match the classes of pteridophytes given in column I with their examples given in column II and choose the correct option
Column -IColumn-II
(Classes of pteridophytes)(Examples)
A. PsilopsidaI. Selaginella
B. LycopsidaII. Psilotum
C. SphenopsidaIII. Dryopteris
D. PteropsidaIV. Equisetum

A. A II; B I; C IV; D III

B. A I; B II; C IV; D III

C. A II; B I; C III; D IV

D. A II; B IV; C I; D III

What is the correct answer?

4

In angiosperms, a mature male gametophyte is derived from a pollen mother cell by

A. three mitotic divisions.

B. one meiotic and two mitotic divisions.

C. two meiotic divisions.

D. a single meiotic division.

What is the correct answer?

4

Why rhodophyta exhibit a red colour ?

A. Since most rhodophyta grow at great depths, the chlorophyll can only absorb light in the red area of the spectrum.

B. The wavelengths of light that are absorbed by chlorophyll are passed to phycoerythrin (a red pigment).

C. Red pigment of rhodophyta absorbs all the light waves.

D. The light reaching the greatest depth in water is in the blue-green region of the spectrum, is absorbed by phycoerythrin.