Structural Organisation in Animals — BIOLOGY STD 11 Science — Question

Explain the three types of cell junctions.

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?

Every nutrient comes from the abiotic component of the ecosystem. These nutrients are converted by green plants into useful substances and finally go to other living beings through the food chain. Finally, after the death of plants and animals; decomposers send them back to the environment. Thus the balance of various components of the ecosystem is maintained. In your view which of the following is the correct approach? What is the importance of balance of ecosystem for us?

1. We should protect the ecosystem so that its balance is maintained.
2. We should enjoy our life and let the nature do its job of maintaining the balance in the ecosystem.

Write any four important characteristics of fungi.

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

Will the ascent of sap be possible without the cohesion and adhesion of the water molecules? Explain.

Draw a diagram of a flowering plant and write functions of different parts.

How many vertebrae in all do we have? Categorise them on the basis of their location giving the specific number in each category.

Two groups (A and B) or bean plants of similar size and same leaf area were placed in identical conditions. Group A was exposed to light of wavelength 400-450nm and Group B to the light of wavelength of 500-550nm. Compare the photosynthetic rate of the two groups by giving reason.

Do amino acids exist as Zwitter ion. Give its structure. Why is it formed?