Locomotion and Movement — BIOLOGY STD 11 Science — Question

Define the term inflorescence. Explain the basis for the different types inflorescence in flowering plants.

Examine the following diagram and answer the following questions:


i. What is the diagram representing?
ii. When point A becomes permeable to Na¹, what change occurs in the polarity of the membrane.
iii. What is the potential difference at point A called ?

Biology teacher was teaching cell cycle in the class. She taught that cell is the basis from which life exists. Also explained well about cell cycle. Robin who was a bright student was facing difficulties in understanding the topic he reached home and asked her sister who is a student of biology in a college about details of cell cycle and cell theory. She explained him that according to cell theory, cells arise from pre-existing cells and the process involved is cell division. Sexually reproducing organisms start their life from a single cell, called zygote, and cell divisions do not stop with the formation of a mature organism, but continue throughout the life.

1. What is meant by cell cycle?
2. Which is the actual phase of cell division?
3. When (at what phase) do the cell organelles duplicate?
4. What values are reflected from the Robin's concern?

Can all the four chambers of the human heart experience systole simultaneously? Explain justifying your answer.

Write the types of following structures in mammals:

1. Kidneys
2. Fertilisation
3. RBCS
4. Brain
5. Parental care
6. Sexual dimorphism

Write any four important characteristics of fungi.

What is the general structure of Bryophytes?

Write any four differences between phycomycetes and ascomycetes.

Explain the following terms:

1. Actinomorphic.
2. Gamosepalous.
3. Syncarpous.

Distinguish between a Bird and Bat.