Question
Write down four characters of Osteichthyes and give two examples.
✓
Answer
- Osteichthyes are marine and fresh water fishes with partly or whole bony endoskeleton.
- Body is generally spindle shaped.
- Skin is either naked or covered with cycloid or ctenoid scales.
- Heart is two chambered containing one auricle and one ventricle.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A stone is dropped from a $100 m$ high tower. How long does it take to fall?
$a.$ the first $50 m$ and
$b.$ the second $50 m .$
→$a.$ the first $50 m$ and
$b.$ the second $50 m .$
Explain what will happen if in a cultivated field only manures are supplied and in another field only fertilizers are supplied, keeping all other conditions similar.
Define animal husbandry. Write about its scope.
- Identify Figure $A, B$ and $C.$
- Which one of them has heavy deposition of lignin$?$
- Which one of them provides both mechanical strength as well as flexibility$?$
- Which one of them can be modified to form air cavities in awuatic plants$?$
- Which one of them is commercially exploited to obtain Hemp and Jute$?$
What is kidnapped, blindfolded and imprisoned in a big room. How could the man tell if he was in: $(a)$ a city $(b)$ a village $(c)$ a bare room $(d)$ a furnished room.
→The distance between Delhi and Agra is $200\ km.$ A train travels the first $100\ km$ at a speed of 50km/h. How fast must the train travel the next $100\ km,$ so as to average $70\ km/h$ for the whole journey$?$
→Write the differences between mass and weight of an object.
Do you agree that the severity of disease manifestations indirectly depends on the number of microbes in the body? Answer simply Yes or No?
What is the difference between a compression and a rarefaction in a sound wave? Illustrate your answer with a sketch.