Biomolecules — BIOLOGY STD 11 Science — Question

Give the location of hepatic caecae in a cockroach. What is their function?

In a slide showing different types of cells can you identify which type of the cell may be meristematic and the one which is incapable of dividing and how?

Answer the following questions in respect of cockroach:

1. What is meant by paurometabolous?
2. What is the function of gizzard and malpighian tubules?
3. Write the scientific name of cockroach.

What happens when a pressure greater than the atmospheric pressure is applied to pure water or a solution?

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 how during light reaction of photosynthesis, ATP synthesis as a chemiosmotic phenomenon takes place?

A plant species shows several morphological variations in response to altitudinal gradient. When grown under similar conditions of growth, the morphological variations disappear and all the variants have common morphology. What are these variants called?

What is marasmus? What is its cause? Mention six symptoms characteristic of it.

A virus is considered as a living organism and an obligate parasite when inside a host cell. But virus is not classified along with bacteria or fungi. What are the characters of virus that are similar to non-living objects?

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