Extra Questions For Class 9 Science Chapter 7 Diversity in living organisms

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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?

Answer Ans. 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?

Answer Ans. International code of nomenclature.

Q.3. Who proposed three kingdom systems of classification ?

Answer Ans. E.H. Haeckel.

Q.4. What refers to thallus in respect of plants ?

Answer Ans. Plant body which is not divided into stem, root and leaves is termed thallus.

Q.5. What is meant by naked seeded plant ?

Answer Ans. 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?

Answer Ans. 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?

Answer Ans. Thallophyta.

Q.8. What name is given to pore present all over the body of animals belonging to porifera ?

Answer Ans. 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 ?

Answer Ans. Osculum is the single large opening present at the top of sponge.

Q.10. Presence of canal system is characteristic of which animal ?

Answer Ans. Sponges exhibit canal system.

Q.11. What is the function of canal system in sponges ?

Answer Ans. Canal system is for passage of water. Water entering through this system brings food and oxygen.

Q.12. What is meant by radial symmetry ?

Answer Ans. 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 ?

Answer Ans. 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 ?

Answer Ans. 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.

Answer Ans. 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.

Answer Ans. Representatives of phylum echinodermata exhibit radial symmetry in adults and bilateral symmetry in larval stage.

Q.17. What are protochordata ?

Answer Ans. 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.

Answer Ans. (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
kingdom protista.

Answer Ans. 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.

Answer Ans. Species →genus family order class → phylum kingdom

Q.21. Name the kingdom to which protozoa belongs.

Answer Ans. Protozoa belongs to the kingdom protista.

Q.22. What was the modification introduced by Woese in kingdom Monera ?

Answer Ans. Kingdom Monera was subdivided into Archaebacteria and Eubacteria by Woese.

Q.23. Define biodiversity.

Answer Ans. 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.

Answer Ans. 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 ?

Answer Ans. 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 :
(a) Euglena
(6) Paramecium

Answer Ans. 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?

Answer Ans. 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 ?

Answer Ans. Pteridophytes, gymnosperms and angiosperms are referred as vascular plants

Q.29. Name the phylum to which Sycon and Eupleetella belong.

Answer Ans. Syeon and Euplectella are representatives of phylum Porifera (sponges).

Q.30. Mention the location and function of notochord.

Answer Ans. 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.

Answer Ans. (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 ?

Answer Ans. 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.

Answer Ans. 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.

Answer Ans. (a) Panthera tigris
(b) Periplaneta americana
are the scientific names of tiger and cockroach respectively written in an appropriate manner.

Q.35. Expand IUCN.

Answer Ans. 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,

Answer Ans. Centipede and Balanoglossus belong to the phyla Arthropoda and Chordata (Protochordata) respectively.

Q.37. What are lichens ?

Answer Ans. Lichens are symbiotie association between a fungal and an algal partner where fungus provides water and mineral and alga provides nutrition

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