Structural Organisation in Animals
CBSE · Class 11 · Biology
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What is a tissue? How is it different from a single cell?
Answer
A tissue is a group of similar cells along with intercellular substances that perform a specific function. Unlike a single cell that performs all functions, tissues exhibit division of labour where sp…
Name the four basic types of tissues found in complex animals.
Answer
The four basic types of tissues are: 1. Epithelial tissue, 2. Connective tissue, 3. Muscular tissue, 4. Neural tissue. All complex animals consist of only these four basic tissue types organized in sp…
Define organ and organ system with examples.
Answer
An organ is formed when tissues are organized in specific proportion and pattern to perform a particular function (e.g., stomach, lung, heart, kidney). An organ system is formed when two or more organ…
What is the scientific name of the common Indian frog? Which class and phylum does it belong to?
Answer
The scientific name is Rana tigrina. It belongs to Class Amphibia of Phylum Chordata. Frogs are amphibians because they can live both on land and in freshwater.
What are poikilotherms? Give an example.
Answer
Poikilotherms are cold-blooded animals that do not have constant body temperature. Their body temperature varies with the temperature of the environment. Frogs are poikilotherms - their body temperatu…
Distinguish between aestivation and hibernation in frogs.
Answer
Aestivation is summer sleep - frogs take shelter in deep burrows during peak summer to protect from extreme heat. Hibernation is winter sleep - frogs burrow during winter to protect from extreme cold.
Describe the external morphology of a frog's body division and limbs.
Answer
Frog body is divisible into head and trunk only - neck and tail are absent. It has forelimbs (4 digits) and hind limbs (5 digits). Hind limbs are larger and more muscular, used for swimming, walking, …
What are the special features of frog's skin and eyes?
Answer
Skin: Smooth and slippery due to mucus, always moist, dorsal side olive green with dark spots, ventral side pale yellow. Eyes: Bulged and covered by nictitating membrane that protects them while in wa…
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- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
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