to show homology and analogy in plant and animals practical
Answers
Answer:
hey here is your answer
To study homology and analogy with the help of models/charts/specimens of either animals or plants. lizard. ... Analogous Organs: The organs which are quiet different in fundamental structure and embryonic origin but perform same function and may superficially look alike are called analogous organs.
hope it help you
Answer:A. TO STUDY HOMOLOGY
I. IN ANIMALS
Procedure
Observe carefully the preserved specimens of limbs of frog, limbs of lizard and limbs of bat.
Draw diagrams and record your observations.
CBSE Class 10 Science Lab Manual Homology of Plants and Animals
Observations
The limbs of frog, lizard and birds are similar in structure.
Each limb has humerus, ulna, radius, carpal and five sets of digits.
Conclusion
The similarity in structure but difference in function proves that all these homologous organs are evolved from common ancestor.
II. IN PLANTS
Procedure
Observe carefully the given specimens of pitcher plant, venus fly trap and cactus plant.
Record your observations to study the homologous organs and draw diagrams.
Lab Manual Class 10 Science Homology of Plants and Animals
Observations
The leaves are modified for different functions, but the structure is similar.
In pitcher plant, the leaves are modified into pitchers to trap insects.
In venus fly trap plant the leaves are modified into jaws to trap insects.
In cactus plant, the leaves are modified into spines to reduce water loss through transpiration.
Conclusion
The modification of leaves in different plants showing similar origin but different functions shows the homology in plants.
B. TO STUDY ANALOGY
I. IN ANIMALS
Procedure
Observe carefully the preserved specimens of wings of insect, bat and bird.
Draw diagrams and record your observations.
Science lab manual class 10 activities solutions Homology of Plants and Animals
Observations
The function of wings in all the three specimens is same but the structure is different.
The wings of insect has no limbs.
The wings of bat has limbs with five digits whereas the wings of bird has only three digits.
Conclusion
The wings of birds, insects and bats has common use, i.e., flying but the structure is different. These organs are called analogous organs.
II. IN PLANTS
Procedure
Observe the specimens/samples of plants showing leaf tendril, stem tendril and stipular tendril.
Record your observations with the help of diagram.
Science lab manual class 10 free download pdf Homology of Plants and Animals
Observations
The function of all the three types of tendrils is same.
The structure of each tendril and its origin is different.
Conclusion
The types of tendril in plants show the analogy in plants and all these tendrils are analogous organs seen in plants.