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Get Answers to all your Questions
- #Class 11
- #Biology
- #Medical
- #Diversity in Living World
- #National Eligilibility Cum Entrance Test
- #National Eligibility Cum Entrance Test
I. Aves have a monocondylic skull.
II. Aves possess a strong breast bone called keel to which the flight muscles are attached.
III. Aves possess a three chambered heart.
IV. They are warm blooded.
V. Fertilization occurs externally in aves.
Choose the option with all incorrect statements.
Option: 1
I and IV
Option: 2
II and IV
Option: 3
III and v
Option: 4
V only.
Answers (1)
Class Aves - Characteristics Features -
- Birds have streamlined bodies covered with feathers.
- Their forelimbs are modified into wings.
- The hind limbs are covered with scales and help in walking, swimming or clasping tree branches.
- Skin is dry. There is no gland.
- They have a bony endoskeleton. They have light and porous bones called pneumatic bones to assist flight.
- They have a monocondylic skull.
- They have a strong breast bone called keel to which the flight muscles are attached.
- They have a four chambered heart.
- They are warm blooded.
- They are dioecious. Fertilization occurs internally. They are oviparous.
- The jaws are modified to form beak.
- They lack urinary bladder.
- They are uricotelic.
- They consist of additional chambers, Crop and gizzard. Three chambered cloaca.
-
Aves possess four chambered heart and fertilization is internal in them.
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