Selina Concise Class 7 Biology Solution Chapter No. 1- ‘Classification Of Plants’ For ICSE Board Students.
Multiple Choice Questions
1.) Tick the appropriate answer.
(i) The two main categories of plants recognized on the basis recognized on the basis of whether they produce fruits or not :
(a) Biennial and annual (b) Angiosperms and Gymnosperms
(c) Herbs and shrubs (d) Bryophyta and Pteridophyta
Answer : Answer is B, because other groups are primitive group of plants.
(ii) Unicellular organisms with proper nucleus are included in the following group are :
(a) Protista (b) Monera (c) Fungi (d) Algae
Answer : Answer is A, because monera is prokaryotic and those of algae and fungi belongs to multicellular organisms.
(iii) Amoeba belongs to :
(a) Monera (b) Protista(c) Fungi (d) Algae
Answer : Answer is B. Amoeba present in Kingdom Protista.
Short Answer Question
1.) Name the categories of the following :
(i) Plants which do not have roots, stem and leaves————- Thallophytes.
(ii) Plants with no root but have stem and leaves———-Bryophyta.
(iii) Plants with roots, stems and leaves and which bear spore producing bodies————— Pteridophytes.
(iv) The amphibian of the plant kingdom————- Bryophyta.
2.) Give two characteristics one example for each of the following :
(i) Algae : (a) These are Thallophyte organisms which cannot separate into roots, stem and leaves. (b) They are eukaryotic and contains chlorophyll.For example : Spirogyra
(ii) Fungi : (a) These are heterotrophic organismswhich cannot make their own food. (b) The habitat or living place of such living organisms is land that is they are terrestrial. For example : Penicillium.
(iii) Monocot : (a) They have single cotyledon. (b) There is no secondary growth. For example : Wheat
(iv) Dicot : (a) In this two cotyledons are present. (b) They are generally woody plants. For example : Peanuts, Mango
(v) Bryophyta : (a) These are called as amphibians of the plants. (b)They have stem and leaves but no roots. For example : Mosses.
(vi) Pteridophyta: (a) These are called as first true land plants. (b) These are differentiated into root, stem and leaves. For example : Ferns
3.) Differentiate between :
(i) Algae and Fungi
Algae | Fungi |
They contain chlorophyll | They do not contain chlorophyll. |
These are autotrophs. | These are heterotrophs. |
They can live in water. | They can live on land. |
For example : Blue green algae. | For example :Agaricus |
(ii) Monocot and dicot plants
Monocotplants | dicot plants |
They have one cotyledon. | They have two cotyledons. |
Contains fibrous root. | Contains tap root |
Leaves are present with parallel venation. | Leaves are present with reticulate venation. |
For example : Grass | For example : Rose. |
(iii) Autotrophs and Heterotrophs
Autotrophs | Heterotrophs |
They can prepare their own food. | They cannot prepare their own food. |
They are autotrophs. | They are heterotrophs. |
Independent of other organisms for food. | Dependent on other autotrophs for their food. |
For example : Plants | For example : Animals |
(iv) Bacteria and Amoeba
Bacteria | Amoeba |
Bacteria are prokaryotes. | Amoeba are eukaryotes. |
Bacteria can be present everywhere. | Amoeba are present in water. |
They can be seen in high power microscopes. | They can be seen in simple microscope also. |
For example : E.coli | For example : Proteus |
(v) Mosses and Ferns
Mosses | Ferns |
They belong to Bryophyta. | They belong toPteridophyta. |
These are amphibian of the plants. | These are true land plants. |
Has no root but stem and leaves present. | Contains roots, stem and leaves. |
For example : Riccia | For example :Equisitum |
(vi) Angiosperms and gymnosperms
Angiosperms | Gymnosperms |
Contain seeds enclosed within ovary. | Naked seeds are present. |
They are flowering plants. | They are non flowering plants. |
These are highly advanced plants. | These are primitive as compared to angiosperms. |
For example : Mango and rose | For example : Pinus |
4.) Match the items given under Column I with those given under Column II:
Column A Column B
(i) Bread mould (a) Has chlorophyll
(ii) Spirogyra (b) Leaves with spores
(iii) Moss (c) Naked seeds
(iv) Fern (d) Saprophyte
(v) Gymnosperm (e) Has rhizoids
Answer:
Column A Answer
(i) Bread mould(d) Saprophyte
(ii) Spirogyra (a) Has chlorophyll
(iii) Moss (e) Has rhizoids
(iv) Fern (b) Leaves with spores
(v) Gymnosperm (c) Naked seeds
LONG ANSWER QUESTIONS (Write the answer in your own notebook)
1.) What name is given to the bacteria found in the root nodule of pea plants ? State their importance.
Answer: The name is given to the bacteria found in the root nodule of pea plants is Rhizobium. They converts the nitrogen into usable form and lives in mutualistic relationship with plants, which is form in the process of photosynthesis.
2.) Briefly explain four types of bacteria on the basis of their shape.
Answer: The bacteria divided into 4 types on the basis of shape.
(a) Cocci : They are circular in shape.
(b) Bacilli : These bacteria are rod in shape.
(c) Spirillum : These have spiral shape.
(d) Vibrio : Such bacteria are called comma shaped bacteria.
3.) Give reasons for the following :
(i) Bryophytes are called amphibians of plant kingdom
Answer : Bryophytes are called amphibians of plant kingdom because the plants lives in both water and on land and therefore such living organisms are called as amphibians of the plant.
(ii) Amoeba does not have any regular shape.
Answer : They do not have any regular shape because cell wall is absent in amoeba. Cell wall gives a tough structure to the organism and therefore due to absence of cell wall it has irregular shape.
4.) What is a contractile vacuole ? State its function in amoeba.
Answer: Contractile vacuole is present in amoeba for the purpose of excretion, the contractile ring increases diameter when more water is present and decrease in diameter when less water is present.
5.) List out 5 uses each of bacteria and fungi in our lives.
Answer: Bacteria : (a) The bacteria are useful to man in various purposes such as producing medicines, biogas and gobar gas. (b) It is also useful in composting and fermentation. (c) Bacteria also play role in formation of curd. (d) They are useful in preparation of vaccines. (v) Some bacteria provides vitamins also.
Fungi : (a) Useful in formation of antibiotics. (b) They are used in making bread. (c) They are responsible for ripening purpose in case of cheese. (d) can be act as food source, add in food. (e) They also makes vitamins.
6.) “Bacteria are harmful to human beings” Briefly explain this statement.
Answer: Bacteria causes various harmful diseases such as Cholera caused by bacterium Vibrio cholerae, typhoid causes also due to bacteria Salmonella typhi, along with this Tuberculosis, Pneumonia, Diphtheria are also bacterial diseases. Bacteria also causes food poisoning, spoilage of food and contaminate water
7.) With reference to number of seeds, venation in the leaves and type of roots, differentiate between monocotyledonous and dicotyledonous plants.
Monocotyledonousplants | dicotyledonous plants |
They have leaves parallel venation. | They have leaves with reticulate venation. |
Contains single cotyledon. | Contains two cotyledons. |
Root can be Fibrous. | Root can be tap root. |
For example : Rice | For example : Rose |
8.) Briefly describe binary fission in amoeba.
Answer; Amoeba reproduces by means of binary fission, that means there are two divisions. Amoeba gives rise to two daughter cells, with the help of two divisions. The binary fission depends on environmental factors also. In binary fission the nucleus of amoeba divide into two and then division of cells.