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Diversity in Living Organisms — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceDiversity in Living Organisms4 Marks
Question
Vertebrates have a true vertebral column and internal skeleton, allowing a completely different distribution of muscle attachment points to be used for movement. Vertebrates are bilaterally symmetrical, triploblastic, coelomic and segmented, with complex differentiation of body tissues and organs. All chordates possess the following features, Such as they have a notochord, a dorsal nerve cord, paired gill pouches.Vertebrates are grouped into six classes.
CYCLOSTOMATA
Cyclostomes are jawless vertebrates. They have an elongated eel-like body, circular mouth, slimy skin and are scale less. They are ectoparasites or borers of other vertebrates. Example, Petromyzon (Lamprey) and Myxine
PISCES
These are fish. They are exclusively aquatic animals. Their skin is covered with scales. They obtain oxygen dissolved in water by using gills. The body is streamlined, muscular tail is used for movement. They are cold-blooded and their hearts have only two chambers, they lay eggs. Examples, tuna or rohu.
AMPHIBIA
These animals differ from the fish in the lack of scales, in having mucus glands in the skin, and a three-chambered heart. Respiration is through either gills or lungs. They lay eggs. These animals are found both in water and on land. Examples, Frogs & toads.
REPTILIA
These animals are cold-blooded, have scales and breathe through lungs. They have a three-chambered heart, crocodiles have four heart chambers. They lay eggs with tough coverings and do not need to lay their eggs in water, unlike amphibians.Examples, Snakes, turtles, lizards.
AVES
These are warm-blooded animals and have a four-chambered heart. They lay eggs. There is an outside covering of feathers, and two forelimbs are modified for flight. They breathe through lungs.
MAMMALIA
Mammals are warm-blooded animals with four-chambered hearts. They have mammary glands for the production of milk to nourish their young. Their skin has hairs as well as sweat and oil glands. However, Examples, Kangaroo.
(1) Which of the following is not a characteristic feature of Mammals?
$(a)$ Warm blooded animal
$(b)$ Four chambered heart
$(c)$ Have mammary gland
$(d)$ Skin in covered with scales
(2) Which of the following is a characteristic feature of Reptiles?
$(a)$ Cold blooded animal
$(b)$ Generally have three chambered heart
$(c)$ Have mammary gland
$(d)$ Both $a$ & $b$
(3) Which class of vertebrates are known as jawless vertebrates?
$(a)$ Amphibian
$(b)$ Aves
$(c)$ Mammalia
$(d)$ Cyclostomata
(4) Enlist the six classes of Vertebrates?
(5) Give any three characteristic feature of Aves
✓

Answer

$(1) D$
$(2) D$
$(3) D$
$(4)$ Vertebrates are grouped into six classes
  • Pisces
  • Cyclostomata
  • Amphibian
  • Aves
  • Mammalia
  • Cyclostomata
$(5)$Characteristic feature of Aves
  • These are warm-blooded animals.
  • They have a four-chambered heart.
  • They lay eggs.
  • There is an outside covering of feathers.
  • Two forelimbs are modified for flight.
  • They breathe through lungs.

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i. Which tissue help in the secondary growth of the plant?
ii. In what region of the plant does intercalary meristematic growth occur?
iil. Where does meristematic tissue mostly found in a plant?
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Statement $2 –$ Photosynthesis is performed by all life-forms that contain Chlorophyll
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$(c)$ Only $3$
$(d)$ All of the above
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$(a)$ Both $1$ & $2$
$(b)$ Both $1$ & $3$
$(c) $ Both $3$ & $4$
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$(b)$ Enzymes
$(c)$ Amino acids
$(d)$ Nitrogen
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$(b)$ Apical meristem
$(c)$ Intercalary meristem
$(d)$ Lateral meristem
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$(b)$ Intercalary Meristem
$(c)$ Apical Meristem
$(d)$ All of the above
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$(a)$ Energy
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