Classification of Plants ICSE Class-7th Concise Selina Biology Solutions
Classification of Plants ICSE Class-7th Concise Selina Biology Solutions Chapter-2 .We Provide Step by Step Answer of Objective, True False , Fill in the blanks , Match the following , Short/Long Answer Type of Exercise-2 Plant And Animal . Visit official Website CISCE for detail information about ICSE Board Class-7.
Classification of Plants ICSE Class-7th Concise Selina Biology Solutions Chapter-2
Multiple Choice question
1.Tick (✓) the appropriate answer :
(i) The two main categories of plants recognised on the basis of whether they produce fruits or not:
a) Biennials and annuals
b) Angiosperms and gymnosperms
c) Herbs and shrubs
d) Bryophyta and pteridophyta
Angiosperms and gymnosperms
(ii) Unicellular organisms with a proper nucleus are known as :
(iii) Amoeba belongs to :
Short Answer Questions (Classification of Plants ICSE Class-7th)
1. Name the categories of the following:
- Plants which do not have roots, stems, and leaves: Thallophyta.
- They have no roots, but have stems and leaves: Bryophyta or Mosses.
- Plants with roots, stems, and leaves, and which bear spore- producing bodies: Pteridophyta or Ferns.
- The amphibians of the plant kingdom mosses (Bryophytes)
2. Give two characterists and one example of each of the following:
Ans. Example: Spirogyra
(a) these are found in stagnant water of ponds, growing as green scum
(b) they have chlorophyll
Ans. Example: Mushroom
(a) They cannot prepare their food
(b) Most fungi live on dead and decaying organic matter
Ans. Example: Maize
(a) They have seeds with one cotyledon
(b) Cotyledon usually becomes the embryonic first leaves of a seedling
Ans. (a) They contain two cotyledons in their seed.
(b) They have network like (reticulate) venation in their leaves.
Examples : gram, rose, mango.
Ans. (a) They have stems and leaves but no roots.
(b) They are non-flowering plants.
Examples : mosses, liverworts.
Ans. (a) They are non-flowering plants i.e. do not produce flowers are seeds. They reproduce through spores
(b) They have feather like leaves divided into leaflets. Example : ferns
Ans. (a) These plants do not have roots, stems or leaves.
(b) They are non-flowering plants.
Examples : Bacteria, fungi, algae
3. Differentiate between (Classification of Plants ICSE Class-7th)
(i) defference between Algae and fungi
- Usually green having chlorophyll
- Found in stagnant water of ponds.
- Are usually Autotrophs e.g. Spirogyra
- Do not have chlorophyll
- Found on dead and decaying organic matter.
- Are usually saprophytes. e.g. Bread mould
defference between Monocot and dicot plants.
The plants which contain only one cotyledon in their seeds.
example: Grass, Maize
The plants which contain two cotyledons in their seeds.
example: Brinjal, Mango
defference between Autotrophs and heterotrophs
- They can make their own food using solar energy.
- These include green plants having chlorophyll.
- They are also called producers.
- They cannot make their own food and depend on autotrophs or other heterotrophs for food.
- These include animals and non-green plants.
- They are called consumers.
defference between bacteria and amoeba
- Bacteria are one of the smallest and structurally the simplest organisms.
- They are unicellular cells
- We are found every-where air, water, soil, the bodies of humans, plants and animals.
- They are visible only under a high powered light microscope
- Amoeba is one of the simplest animals.
- It is made up of just one single cell.
- Amoeba is found in ponds, ditches and other places with stagnating water.
- They can be seen under the microscope only
defference between mosses and ferns
- Mosses grow as green, velvety layers in moist places such as damp soil, on the bark of trees, and on damp walls.
- These plants have stems and leaves, but no roots
- Ferns are grown in most of the gardens for their beautiful leaves.
- They bear well-formed leaves, stems and roots.
defference between Angiosperms and gymnosperms
- These plants bear seeds inside a fruit.
- Leaves are usually broad.
- They usually shed their leaves every autumn.
- Examples: rose, sunflower, sugarcane.
- These plants bear naked seeds called cones. Fruit is absent.
- Leaves are usually needle like. They usually remain green throughout the year. .
Examples: Pine, cedar, fir.
4. Match the items given under column I with those given under
Long Answer Questions (Classification of Plants ICSE Class-7th)
What name is given to bacteria found in the root nodules of pea plants ? State their importance.
Rhizobium bacteria are found living in the root nodules (small swollen structures on roots) of leguminous plants like the pea, bean etc. These bacteria trap the nitrogen from the atmosphere and convert it into nitrates (mineral salts) which can be easily absorbed by the plants from the soil along with the water. It is observed here that the bacteria provide food to the host plant and the host plant in turn provides shelter for the bacteria. This kind of relationship wherein two organisms live in harmony each benefiting from such a relationship is called symbiosis. The organisms are called symbionts.
Briefly explain four types of bacteria on basis of their shape.
There are four common forms of bacteria – coccus, bacillus, spirillum and vibrio.
- Coccus form: These bacteria are spherical or ovoid in shape.
- Bacillus form (bacillus : rod) These are rod-shaped. These may also occur singly or in group of two’s or three’s, joined end to end in long chains.
- Spirillum form: These are spiral-shaped.
- Vibrio form: These are short, curved, appearing comma- shaped. Chloera bacteria (Vibrio cholerae) are of vibrio type.
Give reasons for the following:
(i) Bryophytes are called amphibians of plant kingdom.
(ii) Amoeba does not have any regular shape.
- Since bryophytes grow on land but need water for reproduction (like frogs in animals), they are called the amphibians of plant kingdom.
- The body of Amoeba is irregular in shape. The outer covering of the body is the cell membrane. A prominent nucleus lies in the center surrounded by cytoplasm.
What is a contractile vacoule ? State its function in amoeba.
Excess of water from the body of the amoeba is collected in the contractile vacuole. Ammonia is soluble in water. Hence, sometimes ammonia is expelled out along with the water from the contractile vacuole.
Function: The contractile vacuole expands when there is water in it and shrinks when the water is released into the surrounding.
List out Jive uses each of bacteria and fungi in our lives.
The uses of Bacteria are :
- Lactobacilus bacteria is used for curdling of milk (formation of curd from milk). It converts the milk sugar (lactose) into lactic acid, giving the sour taste to the curd.
- Certain bacteria like Acetobacter ferment fruit juices into vinegar (acetic acid).
- Tanning of leather: Certain bacteria are used in curing of animal hides and skin.
- Retting of fibres: Jute fibres are separated and made softer by the use of bacteria.
- Formation of compost and manure: Cow dung, horse dung and agricultural wastes are subjected to bacterial action which causes their decay and produce very useful manure.
The uses of Fungi are:
- Fungi are an important source of food. Some mushrooms such as Morechella and Agaricus are edible.
- Yeast, a unicellular fungus, is important in bakeries as it is used in the making of bread. It is also important in the breweries for making alcohol.
- Yeast also produces vitamin B.
- Fungi, like bacteria, are also good decomposes. They decompose dead organic matter and return the nutrients back into the soil.
- Penicillin an important antibiotic is obtained from a fungus called Penicillium notatum.
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