PART - 1 - Unit I : CH - 2 Biological Classification — BIOLOGY STD 11 Science — Question

Explain the difference between cilia and flagella. Draw a diagram and describe their internal structure.

Succulents are known to keep their stomata closed during the day to check transpiration. How do they meet their photosynthetic CO₂ requirements?

In what kind of plants do you come across ‘kranz’ anatomy? To which conditions are those plants better adapted? How are these plants better adapted than the plants, which lack this anatomy?

What is the difference between electrical transmission and chemical transmission?

Describe the structure of the membrane as proposed in fluid mosaic model.

Amit went on mountain for trekking. After reaching at about 2000 m height. He experienced difficulty in breathing. His rate of breathing increased and he decided to discontinue the trek and return back to the ground. Being concerned about his health. ls consulted his doctor friend about it? His friend explained that it is a normal phenomenon and he should have carried an oxygen cylinder while going for the trek.

1. Why is it difficult to breathe as we go up on a height?
2. Why does his friend suggested to carry an oxygen cylinder?
3. Which component of blood show its increase when someone moves from plains to higher altitudes?
4. What values are shown by Amit?

During the biology class, teacher taught that water should be conserved in the body of animals because it is precious and non-renewable in some cases. He asked the student that how the nature conserves water even through the excretory system are present in different organisms.

1. Name three major excretory products of animals.
2. Does loop of Henle play any role in water conservation in humans?
3. Explain excretory organs in different animal groups.
4. What values does the teacher possess?

Briefly describe the structure of brain.

Describe economic importance of the largest phylum.

Illustrate a glycosidic, peptide and a phospho-diester bond.