Samacheer Kalvi 8th Science Book Back Answers Chapter 17

Samacheer Kalvi 8th Science Book Back Question and Answers:

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8th Science Book Back Chapter 17 Solutions Guide PDF:

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8th Science Chapter – 17

Plant Kingdom – Book Back Answers

I. Choose the correct answers

1. Solanum trilobatum is the binomial name of Thoothuvalai. Here the word ‘Solanum’ refers to …………….
(a) Species
(b) Genus
(c) Class
(d) Orders
Answer: (b) Genus

2. …………….. is an example for colonial form of algae.
(a) Oscillatoria
(b) Nostoc
(c) Volvox
(d) Chlorella
Answer: (c) Volvox

3. Floridean starch is a reserve food material of …………….
(a) Chloroplyceae
(b) Phaeophyceae
(c) Rhodophyceae
(d) Cyanophyceae
Answer: (c) Rhodophyceae

4. The edible mushroom is …………….
(a) Polyporus
(b) Agaricus
(c) Pennicillium
(d) Aspergillus
Answer: (b) Agaricm

5. Soil erosion is prevented by …………….. plants.
(a) Algae
(b) Fungi
(c) Bryophytes
(d) Pteridophytes
Answer: (c) Bryophytes

6. The first vascular cryptogams in land plants are …………….
(a) Bryophytes
(b) Pteridophytes
(c) Gymnosperm
(d) Angiosperm
Answer: (b) Pteridophytes

7. The well – developed sporophytic plant body is seen in ……………..
(a) Bryophytes
(b) Pteridophytes
(c) Gymnosperms
(d) Angiosperms
Answer: (c) Gymnosperms

8. Binominal Nomenclature was first introduced in the year of ……………
(a) 1970
(b) 1975
(c) 1978
(d) 1623
Answer: (d) 1623

9. Penicillin is an antibiotic, which is extracted from
(a) Algae
(b) Fungi
(c) Bryophytes
(d) Pteridophytes
Answer: (b) Fungi

II. Fill in the blanks:

The word ‘Taxonomy’ is derived from …………….
Binomial Nomenclature was first introduced by …………….
The book “Genera Plantarum” was written by ……………..
Monocotyledon seeds bear only …………….. cotyledon.
Brown algae belongs to ……………. class.
Agar Agar is obtained from ……………. algae.
The reserve food material of fungi are and …………….
The first true land plant is …………….
Xylem and phloem are absent in ……………. plants.
Reticulate venation is present in ……………. plants.

Answer:

Greek
Gaspard Bauhin
Bentham and Hooker
One
Phaeophyceae
Red
Glycogen, oil
Pteridophyte
Bryophyte
Dicot

III. State true or false. If false, correct the statement.

1. In polypetalae, the petals are free.
Answer: True.

2. Binomial name should contains more than two words.
Answer: False.
Correct statement:
Binomial name should contain two words.

3. Artificial system of classification is based on the vegetative characters of the plant.
Answer: False.
Correct statement:
Artificial system of classification is based on the morphological characters of the plant.

4. Cell wall of fungi is made up of chitin.
Answer: True.

5. Pinus is a closed seeded plant.
Answer: False.
Correct statement:
Pinus is a naked seeded plant.

6. All bryophytes are hydrophytes.
Answer: False.
Correct statement:
All bryophytes are amphibians.

7. Dicotyledons have well developed characters than the monocotyledons.
Answer: False.
Correct statement:
Monocotyledons have well developed characters than the dicotyledons.

8. Mosses are the well developed plant in bryophytes.
Answer: True.

9. The dominant phase of the bryophytes is sporophytes.
Answer: False.
Correct statement:
The dominant phase of the bryophytes is gametophyte.

10. The dominant phase of the pteridophytes is diploid(2n).
Answer: True.

IV. Match the following:

1. Cyanophyceae a) Green algae
2. Chlorophyceae b) Blue-green algae
3. Phaeophyceae c) Red algae
4. Rhodophyceae d) Brown algae

Answers:

1. b) Blue-green algae
2. a) Green algae
3. d) Brown algae
4. c) Red algae

V. Answer the following questions shortly:

1. Define Thallus.
Answer:
Thallus refers to a plant body which is not differentiated into roots, stem and leaves. Example: Algae.

2. What is mean by Binomial Nomenclature? Give example.
Answer:
The naming of an organisms with two words are known as Binomial Nomenclature. For example, the binomial name of mango is Mangifera indica. Here the first word Mangifera refers to the genus name and the second word indica to the species name.

3. Write any two points of dicotyledons.
Answer:

Seed has two cotyledons.
Plants have tap root system, leaves with reticulate venation.
Flowers are tetramerous or pentamerous. Calyx and corolla are well differentiated.
Pollination occurs mostly by insects.

4. Seeds of gymnosperm plants are naked. Why?
Answer:
In gymnosperms, ovules are borne on megasporophylls and no flowers are produced. Therefore the seeds are described as naked. They are open seed bearing plants.

5. Write any two economic importance of fungi.
Answer:

Mushrooms contain rich protein, minerals and are edible. Example: Agaricus.
The antibiotic penicillin is got from the fungus penicillium notatum other antibiotics like gentamycin, erythromycin are also got from fungi.