Samacheer Kalvi Class 8 Science Unit 17 Plant Kingdom Solutions
Welcome to NCTB Solutions. Here with this post we are going to help 8th class students by providing Solutions for Samacheer Kalvi Class 8 Science Unit 17 Plant Kingdom. Here students can easily find all the solved solution for Plant Kingdom Exercise questions. Also here our Expert Science Teacher’s solved all the questions with easily understandable language with proper guidance so that all the students can understand easily. Here on this post students will get Unit 17 Plant Kingdom exercise solutions. Here all the solutions are based on Tamil Nadu State Board latest syllabus.
Unit 17 Plant Kingdom Exercise Questions Solutions :
(I) Choose the best answer
(1) Solanum trilobatum is the binomial name of Thoothuvalai. The word ‘Solanum’ refers to
(a) Species
(b) Genus
(c) Class
(d) Orders
Answer :
Correct Option → (b)
The word ‘Solanum’ refers to Genus.
(2) Floridian starch is a reserve food material of
(a) Chlorophyceae
(b) Phaeophyceae
(c) Rhodophyceae
(d) Cyanophyceae
Answer :
Correct Option → (c)
Floridian starch is a reserve food material of Rhodophyceae.
(3) An example for colonial form of algae is
(a) Oscillatoria
(b) Nostac
(c) Volvox
(d) Chlorella
Answer :
Correct Option → (c)
Volvox is a example of colonial form of algae.
(4) One of the following is an edible mushroom
(a) Polyporus
(b) Agaricus
(c) Pennicillium
(d) Aspergillus
Answer :
Correct Option → (b)
Agaricus is an edible mushroom.
(5) Plants that prevent soil erosion are
(a) Algae
(b) Fungi
(c) Bryophytes
(d) Pteridophytes
Answer :
Correct Option → (b)
Plants that prevent soil erosion are Fungi.
(6) The first land plants are
(a) Bryophytes
(b) Pteridophytes
(c) Gymnosperm
(d) Angiosperm
Answer :
Correct Option → (a)
The first land plants are Bryophytes.
(7) The well developed sporophytic plants body is seen in
(a) Bryophytes
(b) Pteridophyte
(c) Gymnosperm
(d) Angiosperm
Answer :
Correct Option → (c)
The well developed sporophytic plants body is seen in Gymnosperm.
(8) Binominal Nomenclature was first introduced in the year
(a) 1970
(b) 1975
(c) 1978
(d) 1623
Answer :
Correct Option → (d)
Binominal Nomenclature was first introduced in the year 1623
(9) Penicillin is an antibiotic which is extracted form
(a) Algae
(b) Fungi
(c) Bryophytes
(d) Pteriodophytes
Answer :
Correct Option → (b)
Penicillin is an antibiotic which is extracted form Fungi.
(II) Fill in the blanks
(1) The word ‘Taxonomy’ is derived from ___
(2) Binomial nomenclature was first introduced by ___
(3) The book ‘Genera Plantarum’ was published by ___
(4) Monocotyledon seed bears only ___ cotyledon.
(5) Brown algae belongs to ___ class.
(6) Agar Agar is obtained from ___ algae.
(7) The reserve food material of fungi are ___ and ___
(8) The first true land plant is ___
(9) Xylem and phloem are absent in ___ plants.
(10) Reticulate venation is present in ___ plants.
Answer :
(1) → Greek word Taxis
(2) → Gaspard Bauhin
(3) → Carl Linnaeus
(4) → One cotyledons
(5) → Phaeophyceae class
(6) → Red algae
(7) → Glycogen and oil
(8) → Pteridophytes
(9) → Bryophytes plants
(10) → Dicot plants
(V) Answer very briefly
(1) Define Thallus.
Answer :
The plant body which is not differentiates into root; stem and leaf are known as Thallus. For example algae.
(2) What is meant by binomial nomenclature? Give example.
Answer :
The naming of an organism with two words is known as Binomial Nomenclature. For example : Mangifera indica.
(3) Write any two characters of dicotyledons.
Answer :
Characters of dicotyledons :-
(i) Seeds have two cotyledons.
(ii) Pollination occurs mostly by insects.
(iii) Flowers are tetramerous or pentamerous.
(5) Write any two economic importance of fungi.
Answer :
Two economic importance of fungi are :-
(i) Fungi is used as antibiotics. example → penicillium.
(ii) Fungi are used as food. example → mushroom.
(VI) Answer briefly
(1) Write a short note on natural system of classification.
Answer :
Natural system of classification of plants is classified on the basis of several characters. Bentham and Hookers classification is an example of natural classification system. This system of classification depends on morphological characters of plants and reproductive characters of plants. This classification is published in the book General Plant arum in three volumes.
(2) Write any three economic importance of algae.
Answer :
Three economic importance of algae are :-
(i) Algae is used as food-algae is used as food material in Japan, England and also in India. For example chlorella.
(ii)Algae are used in Agar agar-Agar agar is extracted from some red algae namely Gelidium and Gracillaria. It is used to prepare medium in laboratories.
(iii) Algae is used for obtaining Iodine.
(3) Write the differences between algae and fungi.
Answer :
| Algae : | Fungi : |
| • Algae are usually found in water or moist places. | • Fungi are thread shaped and round shaped spores floating in the water. |
| • Algae are green red or brown in color and have different shapes. | • All fungi are parasites or saprophytes. |
| • Algae used in medicines, cosmetic, paints and iodine products. | • Fungi causes diseases in plant and animals |
| • The disease caused by fungi is ringworm.
|
(4) How many classes are there in bryophytes? What are they?
Answer :
There are three classes in Bryophytes :-
(a) Hepaticae (liverworts)
(b) Anthoceratae (hornworts)
(c) Music (mosses)
(5) Write any four characters of pteridophytes.
Answer :
Four characters of pteridophytes :-
(a) They can be differentiate into root, stem and leaf.
(b) Pteridophytes are true land plants.
(c) Vascular tissues are present.
(d) They are vascular cryptogams.
(VII) Answer in detail
(2) Write any five differences between monocot and dicot plants.
Answer :
| Monocot plants : | Dicot plants : |
| (i) Monocot plants seed has only one cotyledons. | (i) Dicot plants seed have two cotyledons |
| (ii) Plants have fibrous root system and leaves are with parallel venation. | (ii) Plants have tap root systems and leaves are with reticulate venation. |
| (iii) Flowers are trimerous and not differentiated into clays and corolla. | (iii) Flowers are tretramerous or pentamerous calyx and corolla are well differentiated. |
| (iv) Pollination occurs mostly by wind. | (iv) Pollination occurs mostly by insects |
| (v) Example- grass, paddy | (v) Examples-bean, mango ,neem |
(3) Write the differences between gymnosperm and angiosperm.
Answer :
| Gymnosperm : | Angiosperms : |
| (i) They are naked seed plant. | (i) They are closed seed plants. |
| (ii) They have two phase of life Gametophytic and sporophytic. | (ii) They are may be shrub ,herb and tree. |
| (iii) Sporophytic plant body is dominant and it is differentiated into root, stem and leaf. | (iii) They have well developed vascular tissue. |
| (iv) They are calssified into four types, cycadales, Ginkgoales, Coniferales and Gnetales. | (iv) They are classified into two types monocot and dicot. |
| (v) Example – pinus. | (v) Example – bean, mango, grasses etc. |
(4) Write the economic importance of gymnosperms.
Answer :
Economic importance of Gymnosperm are as follows :
(a) Woods of many conifers are used in the paper industries for rg- pinus, agathis.
(b) Conifers are the sources of soft wood for construction packeing and plywood industry.eg- cedrus.
(c) Turpentine an essential oil, extracted from the resin of pinus is used for paint preparation. It is also used medicinally to get relief from pain, bronchitis
(d) Seeds of pinus geradiana are edible.
(e) Ephedrine is an alkaloid extracted from ephedra. It cures asthma and respiratory problems.
(f) These are some economic importance of gymnosperms.
(5) Write the names of medicinal plants and explain their uses.
Answer :
The names of medicinal plants and their uses are :-
(i) Acalypha indica (kuppaimeni)
Usage : Used to cure burns on the skin. Juice of plant leaves mixed with lemon juice to cure ringworm.
(ii) Aegle marmoles( Vilvam)
Usage : Unripe fruit is used to treat indigestion. Used to cure chronic diarrhea and dysentery.
(iii) Solanum trilobatum (thoodhuvalai)
Usage : Leaves and fruits of this plant used to cure cough and cold. Used to treatment of TB and bronchial asthma.
(iv) Aloe vera (southu Katrazhai)
Usage : Used to cure piles and inflammations on the skin. It cures peptic ulcer.
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