Classification of Plants

Solutions for Biology, Class 7, ICSE

Long Answer Questions

15 questions

Question 1(i)

Distinguish between the following pairs on the basis of the words indicated in the brackets [].

Monera and Protista [nucleus]

Long Answer Questions

Answer:

Differences between Monera and Protista on the basis of nucleus:

MoneraProtista
They have no nucleus. They have a poorly developed nucleoid which contains the genetic material.They have a well-developed nucleus bound by a nuclear membrane.

Question 1(ii)

Distinguish between the following pairs on the basis of the words indicated in the brackets [].

Algae and Fungi [modes of nutrition]

Long Answer Questions

Answer:

Differences between Algae and Fungi on the basis of modes of nutrition:

AlgaeFungi
They have chlorophyll. Thus, they can prepare their own food via photosynthesis.Due to absence of chlorophyll, they do not prepare their own food. They mostly live on dead, decaying organic matter.

Question 1(iii)

Distinguish between the following pairs on the basis of the words indicated in the brackets [].

Bryophytes and Pteridophytes [vegetative parts of the plant]

Long Answer Questions

Answer:

Differences between Bryophytes and Pteridophytes on the basis of vegetative parts of the plant:

BryophytesPteridophytes
Bryophytes have stems and leaves, but no roots. Instead, they have thread—like structures called rhizoids which stick to the surface and absorb water.Pteridophytes bear well-formed leaves, stems and roots, but do not produce flowers and seeds. Their leaves produce small rounded bodies on their undersurface. These bodies contain tiny spores which get scattered to produce new plants.

Question 1(iv)

Distinguish between the following pairs on the basis of the words indicated in the brackets [].

Gymnosperms and Angiosperms [reproductive structures]

Long Answer Questions

Answer:

Differences between Gymnosperms and Angiosperms on the basis of reproductive structures:

GymnospermsAngiosperms
Reproductive structures are unisexual cones (male or female) that bear the seeds.Reproductive structures are unisexual or bisexual flowers. The seeds develop within the female part of the flower, called ovary.

Question 1(v)

Distinguish between the following pairs on the basis of the words indicated in the brackets [].

Prokaryotes and Eukaryotes [examples]

Long Answer Questions

Answer:

Differences between Prokaryotes and Eukaryotes on the basis of examples:

ProkaryotesEukaryotes
Prokaryotes, like bacteria, lack a nucleus and other membrane-bound organelles.Eukaryotes, including plants, animals, fungi, and protists, have a nucleus and other membrane-bound organelles.

Question 2

Draw a neat, generalized diagram of a bacterium and label its six important parts. Answer the following questions.

(i) Name the kingdom to which it belongs.

(ii) Write two characteristic features of the kingdom.

(iii) Name the gelatinous, proteinaceous covering which surrounds the cell wall.

(iv) Mention two cellular organelles which are absent in bacterium.

(v) Write the scientific name of a comma-shaped bacterium.

Long Answer Questions

Answer:

The generalized diagram of a bacterium is given below:

Draw a neat, generalized diagram of a bacterium and label its six important parts. Answer the following questions. Concise Biology Solutions ICSE Class 7.

(i) Bacterium belongs to Kingdom Monera.

(ii) Two characteristic features of Kingdom Monera are:

  1. Kingdom Monera includes microscopic, unicellular or single celled organisms.
  2. They have a cell wall, but no nucleus. Hence, they are called Prokaryotic.

(iii) The cell wall is surrounded by a gelatinous or proteinaceous covering called 'capsule'.

(iv) Nucleolus and Mitochondria are two cellular organelles which are absent in bacterium.

(v) The scientific name of a comma-shaped bacterium is Vibrio.
Example- Vibrio cholerae.

Question 3

Given alongside is the figure of an organism. Study the same and answer the following questions.

Given alongside is the figure of an organism. Study the same and answer the following questions. Concise Biology Solutions ICSE Class 7.

(i) Identify the organism.

(ii) Is it a plant/ animal ? Give reason in support of your answer.

(iii) Label the guidelines 1 to 6 shown in the figure.

(iv) Which kingdom does it belong to ?

(v) Write one important role of the parts shown as 3 and 6.

Long Answer Questions

Answer:

(i) The organism shown in the given figure is Amoeba.

(ii) No, Amoeba is neither a plant nor an animal. Amoebas lack chlorophyll and the ability to photosynthesize, unlike plants. Animals have specialized tissues and organs, which amoebas lack. Hence, Amoeba don't fall under either category.

(iii) The guidelines 1 to 6 are:
      1 → Food Vacuole
      2 → Nucleus
      3 → Pseudopodium
      4 → Cell Membrane
      5 → Cytoplasm
      6 → Contractile Vacuole

(iv) Amoeba is a single-celled organism classified under the Kingdom Protista.

(v) Part 3 (Pseudopodium) — Pseudopodium is the organ of locomotion in an Amoeba. It helps amoeba move in the direction it wants to move in.
Part 6 (Contractile Vacuole) — Excess ammonia (waste) and water gets expelled out of the body of Amoeba from Contractile Vacuole.

Question 4

Study the figure given alongside and answer the following questions :

Study the figure given alongside and answer the following questions: Concise Biology Solutions ICSE Class 7.

(i) Identify the organism. Write its common name as well as scientific name.

(ii) Label the guidelines 1 to 5.

(iii) Which kingdom does it belong to ?

(iv) Write one important role of a part shown as 2.

(v) Mention one very specific feature of this category of plants.

Long Answer Questions

Answer:

(i) The organism shown in the given figure is Bread Mould (fungi). While it is commonly known as Bread Mould, its scientific name is Rhizopus.

(ii) The guidelines 1 to 5 are:
      1 → Spores
      2 → Sporangium
      3 → Sporangiophore
      4 → Rhizoids
      5 → Node

(iii) Bread Mould belongs to Kingdom Fungi.

(iv) Sporangium are the spore containing bodies. When the sporangium bursts open, the spores are dispersed into the air. When they land on a suitable substratum, each can grow to form a new mycelium.

(v) This category of plants live on dead, decaying organic matter, so they are called Saprophytes.

Question 5

Briefly explain four types of bacteria on the basis of their shape.

Long Answer Questions

Answer:

Four types of bacteria on the basis of their shape are:

  1. Coccus — These are spherical or ovoid in shape.
  2. Bacillus — These are rod-shaped. They may occur singly or in groups of two or three, joined end to end in long chains.
  3. Spirillum — These are spiral-shaped bacteria.
  4. Vibrio — These are comma-shaped bacteria. For example, Vibrio cholerae.

Question 6(i)

Give reasons for the following:

Bryophytes are called amphibians of the plant kingdom.

Long Answer Questions

Answer:

The Bryophytes are found on damp surfaces in moist places. They are called amphibians of the plant kingdom because they need water to reproduce. Like amphibians they need water as well as land to complete their life-cycle.

Question 6(ii)

Give reasons for the following:

Amoeba does not have any regular shape.

Long Answer Questions

Answer:

Amoeba has cell membrane as the outer covering of body. The cell membrane is a flexible structure which enables Amoeba to change its shape. Also, the Amoeba moves by extending the cytoplasm along the cell membrane, forming a finger-like structure known as Pseudopodia.

Question 7

What is a contractile vacuole? State its function in Amoeba.

Long Answer Questions

Answer:

The contractile vacuole is a vacuole in which the excess of water from the body of the amoeba is collected. The function of the contractile vacuole in Amoeba is excretion. Ammonia is the main waste product of amoeba which dissolves in water and is excreted through the general body surface by simple process of diffusion.

Question 8

List out five uses each of bacteria and fungi in our lives.

Long Answer Questions

Answer:

Five uses of Bacteria are:

  • Bacteria are used to make antibiotic medicines like Streptomycin.
  • Lactobacillus bacteria are used for curdling of milk.
  • Acetobacter bacteria is used to make vinegar from fruit juices.
  • Bacteria are used in tanning of leather and retting of jute.
  • Bacteria causes decay of organic materials, forming manures and composts.

Five uses of Fungi:

  • Fungi are important source of food. For example: Agaricus and Morchella
  • Yeast is used in baking industry and in the breweries for making alcohol.
  • Fungi are good decomposers. They decompose the organic matter and return the nutrient back into the soil.
  • Penicillium notatum is used to make penicillin, an important antibiotic.
  • Some species of Mucor and Penicillium are also used in ripening of cheese.

Question 9

"Bacteria are harmful to human beings." Briefly explain this statement.

Long Answer Questions

Answer:

Bacteria are responsible for a number of diseases, some of which are typhoid, leprosy, TB, pneumonia, cholera, etc. They also cause spoilage of food items such as milk, meat, fish and vegetable. Tinned and package food also get spoiled due to bacteria, after their expiry date. Thus, we can say that the bacteria are harmful to human beings.

Question 10

Briefly describe the binary fission in Amoeba.

Long Answer Questions

Answer:

Binary fission is the process of reproduction in amoeba in which the full grown amoeba splits into two. First the nucleus divides into two, and then the rest of the cell divides in a way that each half gets one daughter nucleus.

Objective Type Questions

16 questions

Question 1(i)

The two main categories of plants recognised on the basis of whether they produce fruits or not are:

  1. Biennials and annuals
  2. Angiosperms and gymnosperms
  3. Herbs and shrubs
  4. Bryophyta and pteridophyta

Answer

Angiosperms and gymnosperms

Reason — Angiosperm are flowering plants that produce fruits while gymnosperms produce only seeds without producing fruits.

Objective Type Questions

Answer:

Question 1(ii)

Unicellular organisms with a proper nucleus are included in the group:

  1. Protista
  2. Monera
  3. Fungi
  4. Algae

Answer

Protista

Reason — Kingdom Protista consists of unicellular organisms with a proper nucleus.

Objective Type Questions

Answer:

Question 1(iii)

Amoeba belongs to:

  1. Monera
  2. Protista
  3. Fungi
  4. Algae

Answer

Protista

Reason — A prominent nucleus is present in Amoeba.

Objective Type Questions

Answer:

Question 1(iv)

Which of the following is saprotrophic in nature ?

  1. Amoeba
  2. Euglena
  3. Mushroom
  4. Spirogyra
Objective Type Questions

Answer:

Mushroom

Reason — Mushroom can not synthesise their own food and depend on dead or decaying matter for their food. So, they are called saprotrophs.

Question 1(v)

The more appropriate term/ phrase for the nucleus in Monerans is :

  1. Nucleolus
  2. Nucleoid
  3. Premature nucleus
  4. Defective nucleus
Objective Type Questions

Answer:

Nucleoid

Reason — The nuclear material of Monerans is not enclosed in a nuclear membrane but is organized in a region called a nucleoid.

Question 1(vi)

The gelatinous, proteinaceous protective covering of a bacterial cell is termed as :

  1. Plasmalemma
  2. Sheath
  3. Cell wall
  4. Capsule
Objective Type Questions

Answer:

Capsule

Reason — The cell wall of a bacterium cell is surrounded by a gelatinous or proteinaceous 'capsule'.

Question 1(vii)

Which of the following bacteria converts fruit juices into vinegar ?

  1. Acetobacter
  2. Rhizobium
  3. Lactobacillus
  4. None of the above
Objective Type Questions

Answer:

Acetobacter

Reason — Certain bacteria like Acetobacter ferment fruit juices into vinegar (acetic acid).

Question 1(viii)

Tuberculosis is caused by a :

  1. Virus
  2. Bacterium
  3. Protozoan
  4. Protist
Objective Type Questions

Answer:

Bacterium

Reason — Bacteria are responsible for causing Tuberculosis.

Question 1(ix)

The part of the seed which stores food is :

  1. Seed coat
  2. Testa
  3. Seed leaves
  4. Tegmen
Objective Type Questions

Answer:

Seed leaves

Reason — "Seed-leaves" or cotyledons store food and form the bulk of the seed.

Question 1(x)

Which of the following category of plants contains seeds inside the cones ?

  1. Bryophyta
  2. Gymnosperms
  3. Pteridophyta
  4. Angiosperms
Objective Type Questions

Answer:

Gymnosperms

Reason — Gymnosperms bear seeds inside the cones. Some cones are male while others are female.

Question 2

Name the following:

  1. The thread-like soft, delicate structures of bread mould.
  2. The category of organisms which feed on dead and decaying organic matter.
  3. The reproductive structure of Gymnosperms which bears seeds inside it.
  4. The root-like structures of Bryophytes.
  5. The cellular structure which eliminates excess water from the body of Amoeba.
Objective Type Questions

Answer:

  1. Hyphae
  2. Saprophytes
  3. Cones
  4. Rhizoids
  5. Contractile vacuole.

Question 3

Correct the following statements by changing the first/ last word only :

  1. Unicellular, prokaryotic organisms are termed as protists.
  2. Animals do not possess a nervous system.
  3. Mushroom is a unicellular fungus.
  4. Rod-shaped bacteria are called cocci.
  5. Reserve food material in bacteria is starch.
Objective Type Questions

Answer:

  1. Unicellular, prokaryotic organisms are termed as bacteria.
  2. Animals possess a nervous system.
  3. Yeast is a unicellular fungus.
  4. Rod-shaped bacteria are called Bacilli.
  5. Reserve food material in bacteria is glycogen.

Question 4

Match the terms in column A with those of column B.

Column AColumn B
(i) Retting(a) Curd
(ii) Tanning(b) Vinegar
(iii) Lactobacillus(c) Cowdung
(iv) Acetobacter(d) Fibres
(v) Biogas(e) Leather
Objective Type Questions

Answer:

Column AColumn B
(i) Retting(d) Fibres
(ii) Tanning(e) Leather
(iii) Lactobacillus(a) Curd
(iv) Acetobacter(b) Vinegar
(v) Biogas(c) Cowdung

Question 5

Given below are sets of four terms. Choose the odd one and write the category for the remaining terms.

  1. Typhoid, Tuberculosis, COVID-19, Cholera
  2. Amoeba, Bacteria, Paramecium, Chlamydomonas
  3. Penicillium, Agaricus, Mucor, Spirogyra
  4. Pine, Fir, Deodar, Cedar
  5. Brinjal, Rice, Grass, Maize
Objective Type Questions

Answer:

  1. Odd one — COVID-19
    Category of the remaining terms — Bacterial diseases

  2. Odd one — Bacteria
    Category of the remaining terms — Protists

  3. Odd one — Spirogyra
    Category of the remaining terms — Fungi

  4. Odd one — Deodar
    Category of the remaining terms — Gymnosperms

  5. Odd one — Brinjal
    Category of the remaining terms — Monocotyledons

Question 6

Name the categories of the following:

  1. Plants which do not have roots, stem, and leaves: ...............
  2. Plants with no roots, but have stems and leaves: ................
  3. Plants with roots, stems, and leaves, and which bear spore-producing bodies: ...............
  4. The amphibians of the plant kingdom: ...............
Objective Type Questions

Answer:

  1. Plants which do not have roots, stem, and leaves — Algae
  2. Plants with no roots, but have stems and leaves — Bryophyta
  3. Plants with roots, stems, and leaves, and which bear spore-producing bodies — Pteridophyta
  4. The amphibians of the plant kingdom — Bryophyta

Question 7

Match the items given under column I with those given under column II:

Column IColumn II
(i) Bread mould(a) Has chlorophyll
(ii) Spirogyra(b) Leaves with spores
(iii) Moss(c) Naked seeds
(iv) Fern(d) Saprophytes
(v) Gymnosperm(e) Has rhizoids
Objective Type Questions

Answer:

Column IColumn II
(i) Bread mould(d) Saprophytes
(ii) Spirogyra(a) Has chlorophyll
(iii) Moss(e) Has rhizoids
(iv) Fern(b) Leaves with spores
(v) Gymnosperm(c) Naked seeds

Short Answer Questions

5 questions

Question 1

Define the terms given below :

  1. Classification
  2. Binary fission
  3. Pseudopodia
  4. Symbiosis
  5. Mycelium
Short Answer Questions

Answer:

  1. Classification — Classification is a system of arranging living organisms into groups based on their similarities and differences.

  2. Binary fission — In a full-grown Amoeba, first the nucleus divides into two, and then the rest of the cell divides in a way that each half gets one daughter nucleus. This process is called binary fission.

  3. Pseudopodia — Pseudopodia (meaning false feet) is the organ of locomotion in an amoeba.

  4. Symbiosis — Symbiosis refers to a close and long-term interaction between two different types of organisms. For example, Rhizobium bacteria lives in the root nodules of leguminous plants. These bacteria provide food to the host plant and the host plant in turn provides shelter to the bacteria.

  5. Mycelium — A network of hyphae is called mycelium.

Question 2

Give two examples of each of the following :

  1. Gymnosperms
  2. Multicellular fungi
  3. Monerans
  4. Protists
  5. Leguminous plants
Short Answer Questions

Answer:

  1. Gymnosperms — Pine and Cedar

  2. Multicellular fungi — Morchella and Agaricus

  3. Monerans — Coccus and Bacillus

  4. Protists — Amoeba and Paramecium

  5. Leguminous plants — Pea and Bean

Question 3

Name :

  1. Five kingdoms according to the recent system of classification.
  2. Four categories of bacteria according to their shapes.
  3. Five bacterial diseases.
  4. Five categories of plants in kingdom Plantae.
  5. Two categories of Phanerogams.
Short Answer Questions

Answer:

  1. Kingdom Monera, Kingdom Protista, Kingdom Fungi, Kingdom Plantae, Kingdom Animalia
  2. Coccus, Bacillus, Spirillum, Vibrio
  3. Typhoid, Tuberculosis, Pneumonia, Cholera, Diphtheria
  4. Algae, Bryophyta, Pteridophyta, Gymnosperms, and Angiosperms
  5. Gymnosperms and Angiosperms

Question 4

Write scientific names of the causing agent for each of the following diseases :

  1. Typhoid
  2. Tuberculosis
  3. Pneumonia
  4. Cholera
  5. Diptheria
Short Answer Questions

Answer:

  1. Typhoid — Salmonella typhi

  2. Tuberculosis — Mycobacterium tuberculosis

  3. Pneumonia — Streptococcus pneumoniae

  4. Cholera — Vibrio cholerae

  5. Diptheria — Corynebacterium diphtheriae

Question 5

Give two characteristics and one example for each of the following:

  1. Algae
  2. Fungi
  3. Monocot
  4. Dicot
  5. Bryophyta
  6. Pteridophyta
  7. Gymnosperms
Short Answer Questions

Answer:

  1. Two characteristics of Algae are:
    1. They are aquatic in habitat.
    2. They have chlorophyll and hence they are autotrophs.
      Example — Spirogyra
  2. Two characteristics of Fungi are:
    1. Body is composed of thread like structure called hyphae.
    2. Chlorophyll is absent and they show heterotrophic nutrition.
      Example — Agaricus (Mushroom)
  3. Two characteristics of Monocot are:
    1. Seeds have a single cotyledon.
    2. Leaves have parallel venation and roots are fibrous.
      Example — Maize
  4. Two characteristics of Dicot are:
    1. Seeds have two cotyledons.
    2. Leaves with reticulate venation and roots show tap root system.
      Example — Pea
  5. Two characteristics of Bryophyta are:
    1. They have leaves and stems but no roots.
    2. They have root like structure known as rhizoids.
      Example — Moss
  6. Two characteristics of Pteridophyta are:
    1. They have well formed leaves, stems and roots.
    2. They do not produce flowers and seeds.
      Example — Fern
  7. Two characteristics of Gymnosperm are:
    1. Flowers and fruits are absent.
    2. Bear naked seeds which are not enclosed in a fruit.
      Example — Pine