Diversity in Living Organisms Extra Questions and Answers Science Chapter 7
Are you looking for Diversity in Living Organisms Extra Questions and Answers, if yes? then you the right place. Here we are providing Diversity in Living Organisms Extra Questions and Answers Class 9 Science Chapter 7.
- 1-mark questions:
Q.1) What is meant by ‘characteristics?
Ans. a characteristic is a specific feature or function carried out by an organism. For example, having five fingers on each forelimb is a characteristic of some organism. Apart from this animal can perform locomotion but tree cannot, is an example of distinguishing characteristic.
Q.2) What organisms can be said to belong to the same species?
Ans. A species comprises of all organisms with similar characters which can breed to reproduce.
Q.3) What is the distinguishing character in Monera?
Ans. The basis of distention in Monera is not having a definednucleus or organelles. They have mainly unicellular body design.
Q.4) Give examples of organisms belonging to class Protista.
Ans. Examples of Protista are unicellular algae, diatoms and protozoans.
Q.5) Give the difference between saprophytic and parasitic mode of life?
Ans.In Saprophytic mode of nutrition, organism feed on dead and decaying matter whereas parasitic organisms require a living protoplasm of a host organism for food.
Q.6) What are lichens?
Ans. The fungus species which live in symbiotic relationships with cyanobacteria are termed as lichens.
Q.7) What are the regions of mega biodiversity?
Ans. The regions of mega biodiversity on earth lies between the tropic of Cancer and the tropic of Capricorn which are warm and humid and are rich in diversity of plant and animal life.
- 2-mark questions:
Q.1) What is the basis of classification?
Ans. Grouping of organisms with similar characters is the basis of classification. Defining character is the fundamental basis of classification.
One can then use new characteristics each time for further process of classification within each group.
Q.2) State the names of levels used in classification?
Classification is done by naming the sub-groups at various levels as given inthe following order:
- Kingdom
- Phylum (for animals) / Division (for plants)
- Class
- Order
- Family
- Genus
- Species
Q.3) Give distinguishing characters of funguses
Ans. a.) Funguses are heterotrophic eukaryotic organisms with saprotrophic mode of nutrition.
b.) Usually, they can become multicellular organisms.
c.) Cell walls in fungus chitin.
d.) Examples of fungus are yeasts, molds and mushrooms.
Q.4) Why are pteridophytes called cryptogams?
Ans. a.) Pteridophytes are plants which have well differentiated plant parts like roots, stems, leaves and vascular tissue.
b.) they are termed as pteridophytes as they have hidden or covered reproductive organs.
Q.5) Give the distinguishing characters of Angiosperms
Ans. 1.) These plants produce flowering plants.
2.) The seeds in angiosperms are covered.
3.) Theangiosperms are divided into two groups monocots or dicots, depending on the number of cotyledons presentin the seed.
Q.6) Which type of body cavity is seen in nematodes?
Ans. 1.) In nematode thebody is cylindrical, they have tissues, but no real organs.
2.) They have a false body cavity or a pseudocoelom.
- 5-mark questions:
Q.1) Why is there a need for systematic naming of living organisms?
Ans. 1.) local names of organisms can be difficult to read and write. They can be misleading as well. hence to solve this problem organisms are given ‘scientific’ names which are acceptable throughout the world.
2.) Nomenclature is the method of scientifically naming organisms.
3.) In the eighteenth century, Carolus Linnaeus devised a system fornamingorganisms.
4.) While wring scientific name of an organism we use the genus name and species of that particular organism.
5.) Latin forms of the name are used in the nomenclature system
6.) Other than these following conventions are used whilewriting the scientific names:
1.) The genus name has to be written in capital letter in the beginning.
2.) The species name must be written with a small letter.
3.) The scientific name is written in italic when printed.
4.) The genus and species names must be underlined separately when written by hand.
Q.2) With the help of a flowchart give the plant classification.
Q.3) Explain in brief the defining character of in non-chordate in kingdom animalia.
Ans. All the organisms which do not possess a notochord are referred to as non-chordates.
- Porifera: these are simple organisms with simple cellular level of organization
- Coelenterate: they have a little more differentiation than porifera and show body cavity.
- Platyhelminthes: These are flat worms with some degree of tissue formation with bilateral symmetry. They do not have true body cavity
- Nematodes: They show presence of pseudocoelom and are commonly called round worms.
- Annelida: These organisms have true body cavity, with extensive body differentiation in segmented way.
- Mollusca: These organisms show reduced coelomic cavity with little segmentation. These organisms have open circulatory system and kidney-like organs for excretion. A foot isused for moving around.
- Arthropoda: The body is segmented with an open circulatory system. They have jointed legs
- Echinodermata: These are spiny skinned, exclusively free-living marine animals. They have a hard skeleton made up calcium carbonate.
- MCQs
1) Which phylum of animals is also called roundworms?
a.) Porifera
b.) Coelenterate
c.) Platyhelminthes
d.) Nematoda
2) The mode of nutrition is saprophytic in which organisms?
a.) Fungi
b.) Monera
c.) Plants
d.) Protista
3) Find out correct sentence:
(a) Protista aremulticellular prokaryotic organisms
(b) Pteridophyta are also called cryptogams
(c) Both Monera and Protista are autotrophic organisms
(d) Monerans have well defined nucleus
4) Which one is the most distinct character of the Pisces?
(a) They are aquatic organisms
(b) Streamlined body covered with scales
(c) Presence of gill for respiration
(d) All the above
5.) Which of the following do not have flowers
(a) Pteridophyta
(b) Gymnosperms
(c) Angiosperms
(d) None of the above
6.) Which is an example of member of Coelenterata?
(a) Spongilla
(b) Euglena
(c) Penicillium
(d) Hydra
7.) Which organisms are called the amphibians of the plant kingdom?
(a) Pteridophyta
(b) Bryophyta
(c) Thallophyta
(d) Phanerogams