Extra Questions For Class 9 Science Chapter 7 Diversity in living organisms
Very Short Answer Type Questions (One Mark Each)
Q.1. What is classification of organisms?
AnswerAns. Arrangement of organisms into groups or sets on the basis of similarities and differences is termed classification.
Q.2. Which organisation state set rule for nomenclature of organism?
AnswerAns. International code of nomenclature.
Q.3. Who proposed three kingdom systems of classification ?
AnswerAns. E.H. Haeckel.
Q.4. What refers to thallus in respect of plants ?
AnswerAns. Plant body which is not divided into stem, root and leaves is termed thallus.
Q.5. What is meant by naked seeded plant ?
AnswerAns. Plants like Pinus bear seeds which are not enclosed by fruit. Such plants are known as naked seeded plants (gymnosperms).
Q.6. What are phanerogams?
AnswerAns. Plants which bear seeds and possess true root, stem and leave with vascular system are known as phanerogams.
Q.7. To which subdivision of cryptogams do algae belong?
Q.8. What name is given to pore present all over the body of animals belonging to porifera ?
AnswerAns. Ostia is the name given to numerous pores present all over the body of animals belonging to porifera.
Q.9. What name is given to the single large opening present at the top of sponge ?
AnswerAns. Osculum is the single large opening present at the top of sponge.
Q.10. Presence of canal system is characteristic of which animal ?
AnswerAns. Sponges exhibit canal system.
Q.11. What is the function of canal system in sponges ?
AnswerAns. Canal system is for passage of water. Water entering through this system brings food and oxygen.
Q.12. What is meant by radial symmetry ?
AnswerAns. An animal is said to be having radial symmetry if any vertical cut divides it into two equal halves
Q.13. What is meant by bilateral symmetry ?
AnswerAns. An animal is said to be having bilateral symmetry when it can be cut into two equal halves through only one vertical cut.
Q.14. What is meant by the term hermaphrodite ?
AnswerAns. Animal having both the sexes male and female in the body are known as hermaphrodite. Examples, Tape worm and Earth worm.
Q.15. Name the respiratory organs of Mollusca.
AnswerAns. Gills called ctenidia are the respiratory organs of Mollusca.
Q.16. Animals of which phylum has radial symmetry in adults and bilateral symmetry in larva.
AnswerAns. Representatives of phylum echinodermata exhibit radial symmetry in adults and bilateral symmetry in larval stage.
Q.17. What are protochordata ?
AnswerAns. Lower chordates having notochord are known as protochordates e.g., Balanoglossus.
Q.18. How many chambers are present in the heart of following animals ?
(i) Fish (ii) Frog (iii) Snake (iv) Birds (u) Monkey.
AnswerAns. (1) Fish-two-chambered heart.
(ü) Frog – three-chambered heart.
(i) Snake – three-chambered heart.
(iv) Birds – four-chambered heart.
(v) Monkey – four-chambered heart.
Q.19. In which kingdom will you place an organism which is single-celled,
eukaryotic and photosynthetic ?
Ans. Single celled, eukaryotic and photosynthetic organism would be categorised under
AnswerAns. Single celled, eukaryotic and photosynthetic organism would be categorised under kingdom protista.
Q.20. Arrange the following in correct sequence from lowest to highest level :
Phylum – species – genus – class – family-order-kingdom.
AnswerAns. Species →genus family order class → phylum kingdom
Q.21. Name the kingdom to which protozoa belongs.
AnswerAns. Protozoa belongs to the kingdom protista.
Q.22. What was the modification introduced by Woese in kingdom Monera ?
AnswerAns. Kingdom Monera was subdivided into Archaebacteria and Eubacteria by Woese.
Q.23. Define biodiversity.
AnswerAns. Biodiversity refers to variety of life forms in a particular habit.
Q.24. Give reason why blue-green algae has been included under the kingdom monera and not under plant kingdom.
AnswerAns. Blue-green algae or cyanobacteria is prokaryotic in nature. It does not have a true nucleus. Well developed organelles are absent. So it is placed under kingdom monera rather than in plant kingdom.
Q.25. What is the mode of nutrition in mushroom ?
AnswerAns. Mushroom exhibits saprophytic mode of nutrition. It absorbs nutrients from the dead decaying organic matter in solution form.
Q.26. Name the appendages present for movement in the following organisms :
AnswerAns. Euglena has whip like flagella for movement. On the other hand, numerous small hair like projections called cilia are present throughout the body surface of paramecium, which pids in wave like motion.
Q.27. Why bryophytes are called the amphibians of the plant kingdom?
AnswerAns. Bryophytes are called as the amphibians of the plant kingdom due to the fret that although they are terrestrial plants but they need water for reproduction and fertilisation during its life cycle. So they are found in moist areas
Q.28. Which group of plants are referred as vascular plants ?
AnswerAns. Pteridophytes, gymnosperms and angiosperms are referred as vascular plants
Q.29. Name the phylum to which Sycon and Eupleetella belong.
AnswerAns. Syeon and Euplectella are representatives of phylum Porifera (sponges).
Q.30. Mention the location and function of notochord.
AnswerAns. Notochord is a long rod like structure that develops between dorsal nervous system and gut. It functions as a support structure that provides points for attachment to muscles.
Q.31. Select the odd one out with respect to classification. Also give appropriate
reason for your choice.
(a) Mango, gram, rice, apple.
(b) Prawn, scorpion, octopus, butterfly.
AnswerAns. (a) Rice is the odd one out as it is a monocotyledon while mango, gram and apple are dicots.
(b) Octopus is a representative of phylum Mollusca while prawn, scorpion and butterfly are representatives of phylum Arthropoda.
Q.32. Why do we place snake as well as turtle in the same class ?
AnswerAns. Snake and turtle are placed in the same class i.e., Reptilia due to the following similar characteristic features :
(1) Both of them have scales on their body.
(2) They are cold blooded animals i.e., their body temperature changes according to the temperature of the environment.
(3) Respiration in snake as well as turtle occurs through lungs.
(4) Both lay their eggs in water.
Q.33. Name the phylum which has the maximum number of animal species.
AnswerAns. Phylum Arthropoda has the maximum number of animal species.
Q.34. Rewrite the scientifie names correctly as per the conventions :
(a) panthera Tigris
(b) periplaneta Americana.
AnswerAns. (a) Panthera tigris
(b) Periplaneta americana
are the scientific names of tiger and cockroach respectively written in an appropriate manner.
Q.35. Expand IUCN.
AnswerAns. IUCN stands for an organisation or a body which is called as “International Union for Conservation of Nature and Natural resources.’
Q.36. State the phylum to which Centipede and Balanoglossus belong,
AnswerAns. Centipede and Balanoglossus belong to the phyla Arthropoda and Chordata (Protochordata) respectively.
Q.37. What are lichens ?
AnswerAns. Lichens are symbiotie association between a fungal and an algal partner where fungus provides water and mineral and alga provides nutrition
In order to equip the students with the latest methodology of testing and evaluation in competitive exam segment in India Physics Gurukul has introduced successrouter.com for Online Testing and Assessment. Try our free tests for JEE and NEET Today!