Neural Control and Coordination — BIOLOGY STD 11 Science — Question

Draw a diagram of alimentary canal of cockroach and label any six parts in it. (Description is not required)

What is the difference between lymph and blood?

What are mitochondria? What is the basic morphology of these organelles and in which cell can they be found?

Why does the interior of bacterial cell appear simple and granular? Which components make cell envelope of bacterial cell? What gives gummy or sticky trait to bacterial cells and if it is not essential for survival, what are its functions?

Prakhar, a class XI student went out after rains in the garden. He saw earthworms on the ground and wondered how they are able to move, eat and perform various function of life Next day, he went to his biology teacher and asked her about the same. Her biology teacher politely explained him about how different animals have various levels of organisation of cells. She also told her that except sponges and coelenterates, all the animals of the kingdom-Animalia have organ- system level of organisation.

1. What kind of body organisation are present in sponges and coelenterates?
2. Write about the organisation type in lower animals, like protozoans.
3. In which phylums organ system level organisation is found?
4. What values are shown by Prakhar?

Explain, why a pair of homologous Doze chromosomes is genetically different, but a pair of sister chromatids is genetically identical before crossing over in meiosis.

Double fertilisation is an unique event to angiosperms. Explain the event and its possible significance.

How do Basidiomycetes differ from Phycomycetes?

What is the role of sarcoplasmic reticulum, myosin head and F-actin during contraction of striated muscles of humans?