Locomotion and Movement — BIOLOGY STD 11 Science — Question

Explain the structure of the vertebral column of human.

Are the different types of plastid interchangable? If yes, give examples where they are getting converted from one type to another.

How are gibberellins useful in agriculture to improve productivity. Give any three points in support of your answer.

Give a brief account of light reaction.

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?

Write the description of gynoecium in various plants.

What is the difference between lymph and blood?

Respiratory pathway is believed to be a catabolic pathway. However, nature of TCA cycle is amphibolic. Explain.

What is the vascular tissue system? Draw a labelled diagram of the radial and conjoint open vascular bundle.

Differentiate between the following: Apoplast and symplast pathways of movement of water in plants