Important Questions for Class 11 Biology 3rd Chapter Plant Kingdom MCQ, Very Short, Short Type, Long Type
CBSE Class 11 Important Questions for Class 11 Biology Chapter 3 Plant Kingdom all MCQ Type, Very Short Type, Assertion Reason Type, Case Study, Short Type and Long Type Questions with Answers by Expert. Important Questions for Section A, B, C, D Class 11 Biology Chapter 3.
- MCQ’s
Q.1) Assertion: The members of Chlorophyceae are commonly called green algae.
Reason: They are green due to the dominance of pigments r-phycoerythrin
a.) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
b.) Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.
c.) If assertion is true but the reason is false.
d.) if both assertion and reason are false.
Q.2) Which organisms are called amphibians of the plant kingdom becausethese plants can live in soil but are dependent on water for sexualreproduction.
a.) Pteridophytes
b.) Bryophytes
c.) Gymnosperms
d.) Angiosperms
Q.3) Assertion: The occurrence of two fusions i.e., syngamy and triple fusion is termed as double fertilization.
Reason: The zygote develops intoan embryo and the PEN develops intoendosperm which provides nourishment to the developing embryo
a.) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
b.) Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.
c.) If assertion is true but the reason is false.
d.) if both assertion and reason are false.
Q.4) In Phaeophyceae class of algae the food reserve is in form of
a.) amylopectin and glycogen
b.) floridean starch
c.) laminarin or mannitol
d.) oil droplets
Q.5) Asexual reproduction in liverworts takes place by_______
a.) formation of specialised structures called gemmae
b.)buddingin the secondary protonema
c.) fusion of antheridia and archegonia
d.) conversion of spore to gametophyte
Q.6) Evolutionarily, ____________ are the first terrestrial plants topossess vascular tissues – xylem and phloem
a.) Pteridophytes
b.) Bryophytes
c.) Gymnosperms
d.) Angiosperms
Q.7) Assertion: the spread of living pteridophytes is deregulated and derestricted to narrow geographical regions
Reason: Gametophytes require cool, damp, shady places togrowand water for fertilization
a.) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
b.) Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.
c.) the reason is true but the Assertion is false.
d.) if both assertion and reason are false.
Q.8) The gametophyte is free living in
a.) Pinus
b.) Cycas
c.) Eucalyptus
d.) Polytrichum
Q.9) Cytotaxonomy is based on___________
a.) the chemical constituents of the plants
b.) evolutionary relationships between the various organisms
c.) cytological information likechromosome number, structure, behavior
d.) morphological characters
Q.10) Which plant hassmall specialized roots called coralloid roots are associated with N2- fixing cyanobacteria?
a) Cycas
b) Pinus
c) Cedrus
d) Wolffia
Q.11) Fusion of two gametes dissimilar in size is called
a.) isogamy
b.) anisogamy
c.) oogamy
d.) zoogamy
Q.12) Assertion: plants show alternation of generation in their lifecycle
Reason: The diploid gametophyte and haploid sporophyte stages is responsible for this life cycle pattern.
a.) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
b.) Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.
c.) If assertion is true but the reason is false.
d.) if both assertion and reason are false.
- Answer in one sentence
Q.1) Which groups are included under kingdom Plantae?
Ans. The five major groups included under kingdom Plantae are: Algae, Bryophytes, Pteridophytes, Gymnosperms and Angiosperms.
Q.2) What is cytotaxonomy?
Ans. Taxonomists employ cytotaxonomy, which is based on cytological information such as chromosome number, structure, and behavior, and chemotaxonomy, which analyses the chemical constituents of the plant to resolve taxonomical problems.
Q.3) Define: Numerical taxonomy
Ans. Computer-assisted numerical taxonomy is based on all observable attributes. All of the characters are given numbers and codes, and the data is subsequently processed so hundreds of characters can be considered at the same time
Q.4) What is pollination?
Ans. The process in which pollen grains are dispersed from the anthers and carried to the stigma of a pistil by wind or any other agencies is called as Pollination.
Q.5) State the 3 class of algae.
Ans. the three classes of algae are as follows Chlorophyceae, Phaeophyceae and Rhodophyceae.
Q.6) What is pigment is present in family Rhodophyceae?
Ans. Rhodophyceae members are frequently referred to as red algae because of the preponderance of the red pigment r-phycoerythrin in their bodies.
Q.7) State the 4 groups ofpteridophytes with examples.
Ans. Pteridophytes are divided into four groups: Psilopsida (Psilotum), Lycopsida (Selaginella, Lycopodium), Sphenopsida (Equisetum), and Pteropsida (Equisetum) (Dryopteris, Pteris, Adiantum).
Q.8) What is the difference between homosporous and heterosporous plants?
Ans. in homosporous plants only one kind of spores are produced where as in heterosporous two different haploid spores are produced.
Q.9) how does asexual reproduction take place in algae?
Ans. Asexual reproduction in algae takes place with help of flagellated zoospores produced in zoosporangia
- Answer in short
Q.1) How gave the natural system of classification? Give its prominent features.
Ans. 1.) George Bentham and Joseph Dalton Hooker devised the natural classification system for flowering plants.
2.) It was based on natural similarities between species and took into account not only external but also interior characteristics such as ultrastructure, anatomy, embryology, and phytochemistry.
Q.2) What is the basis of the phylogenetic classification system?
Ans. 1.) It is based on evolutionary links between diverse group of organisms.
2.) This classification system implies that species from the same taxon share a common ancestor. 3.) Data from a variety of other sources is used in resolving classification issues when there is no supporting fossil evidence
Q.3) Differentiate between Monocots and Dicot plants
Ans.
Monocots | Dicots |
In monocots, seeds with have a single cotyledon | In dicot plants, Seeds with two cotyledons |
The leaves have parallel venation | The leaves have reticulate venations |
The flowers are trimerous with three members in each floral whorl. | The flowers are either tetramerous or pentamerous flowers |
Q.4) What is the difference between isogamous, anisogamous and oogamous?
Ans.1.)The fusing of two gametes occurs during sexual reproduction. Isogamous gametes can be flagellated and comparable in size, or they can be non-flagellated but similar in size.
2.) Anisogamous refers to the fusion of two gametes of different sizes.
3.) Oogamous fusion occurs when one large, nonmotile (static) female gamete fuses with a smaller, motile male gamete.
Q.5) What are the two important stages in the life cycle of moss?
Ans. 1.) The gametophyte has two stages that are important in a moss life cycle.
2.) The protonema stage, which arises immediately from a spore, is the first stage.
3.) It leads to the formation of a creeping, green, branching, and filamentous stage.
4.) The second stage is the leafy stage, which grows as a lateral bud from the secondary protonema.
5.) They are made composed of thin, erect axes with spirally arranged leaves.
Q.6)What are the adaptions seen in Gymnosperms to withstand adverse climatic conditions?
Ans. Gymnosperm leaves are well-adapted to tolerate temperature, humidity, and wind extremes. Simple or compound leaves are present in gmynosperms. The pinnate leaves of Cycas last for a few years. The needle-like leaves of conifers minimise the surface area. Their thick cuticle and recessed stomata also aid in water conservation.
- Answer in brief
Q.1) Describe the important characteristics of angiosperms.
Ans.1.) The angiosperms are a diverse group of plants that can be found in a variety of environments.
2.) Pollen grains and ovules are formed in specialized structures called flowers in angiosperms. 3.) The seeds of angiosperms are encased or covered in fruits.
4.) Angiosperms have wide range in size from the smallest Wolffia to massive Eucalyptus trees. 5.) Angiosperms are two types: monocotyledons and dicotyledons.
Q.2) State the uses of algae?
Ans. 1.) Algae are beneficial to humans in a number of ways.
2.) Algae fix approximately half of total carbon dioxide on the planet through photosynthesis, which also raises the level of dissolved oxygen in their immediate habitat.
3.) They are crucial as primary producers of energy-rich chemicals, which have been the core of all aquatic species’ food cycles.
4.) Algae are utilized as food in a variety of ways.
5.) Commercially useful hydrocolloids are produced by certain marine algae, such as algin (brown algae) and carrageen (red algae).
6.) Agar, a commercial product derived from Gelidium and Gracilaria, is used to culture bacteria as well as in ice cream and jelly preparations.
7.) Chlorella, a protein-rich unicellular alga, is utilized as a nutritional supplement by astronauts.
Q.3) Describe in detail about the spores produced in gymnosperms.
Ans. a.) Gymnosperms generate haploid microspores and megaspores and are heterosporous.
b.) Both types of spores are formed in sporangia, which are carried on sporophylls that are spirally arranged to form cones.
c.) Microsporangiates contain microsporophylls or microsporangia.
d.) The microspores mature into a male gametophytic generation that is extremely small and restricted to a small number of cells.
e.) Macrosporangiate cones carry the megasporophylls with ovules or megasporangia.
f.) male and female cones or strobili can be found on same or different trees.
g.) Megasporophylls carry the ovules, which can be grouped to create female cones
h.) One of the megaspores within the megasporangium matures into a multicellular female gametophyte with two or more archegonia, or female sex organs.
i) Megasporangium also retains the multicellular female gametophyte.
Q.4) State the different types of patterns seen in the alternation of generation in plants?
Ans. different plant groups, as well as individualsrepresenting them, differ in the following patterns
- The one-celled zygote represents sporophytic generation when no free-living sporophytes are present. The zygote undergoes meiosis, which produces haploid spores, which subsequently divide mitotically to form the gametophyte. The free-living gametophyte is the major photosynthetic phase in such plants. The term “haplontic” refers to this type of life cycle.
- The diploid sporophyte is the plant’s dominant, photosynthetic, and independent phase. A single to few-celled haploid gametophyte represents the gametophytic phase. This is the Diplontic life cycle pattern
- Bryophytes and pteridophytes, for example, have an intermediate state known as Haplo-diplontic pattern.
- Their dominating periods, however, are distinct. A haploid gametophyte represents a dominant, photosynthetic, thalloid or erect phase that alternates with the shortlivedmulticelluler sporophyte that is entirely or partially dependent on the gametophyte for anchoring and nourishment. This pattern is found in all bryophytes.
- A dominant, independent, photosynthetic, vascular plant body represents the diploid sporophyte which alternates with a haploid gametophyte that is multicellular, saprophytic/autotrophic and short-lived. This haplo-diplontic life cycle pattern can be found in all pteridophytes.
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