Cell The Unit of Life — BIOLOGY STD 11 Science — Question

It is always taught by our teachers and parents that we should not eat food or fruits without washing our hands as it contains thousands of germs and pathogens which we cannot see with our naked eyes.

1. What are germs?
2. What are the basic difference between the unicellular and multicellular organisms?
3. Name the instrument that allow us to study the unicellular organisms.
4. What values are taught by our teachers and parents?

Write brief note on the following: Synaptonemal complex.

What is consciousness and which are the stimuli for living things to become conscious?

When a freshly collected Spirogyra filament is kept in a 10% potassium nitrate solution, it is observed that the protoplasm shrinks in size:

1. What is this phenomenon called?
2. What will happen if the filament is replaced in distilled water?

Distinguish between blind spot and yellow spot.

Write the precise function of: Interfascicular cambium.

Why is conduction in a nerve called on the electric phenomenon?

Amrita and her mother planted small seedling of plant in the soil in their garden. After few months, while playing with her friends Amrita observed that the seedlings which they planted had grown into a mature and flourishing plant. Amrita was curious to know this and asked her mother about this.

1. Name the process that causes growth in living organisms.
2. Discuss about the process that how growth occurs in living organisms.
3. Analyse and write about the common sites of mitosis in plants as well as in animals.
4. What values were shown by Smita?

Differentiate between the following:
i. Red algae and brown algae
ii. Liverworts and moss
iii. Homosporous and heterosporous pteridophyte

Differentiate between:
a. Open and closed circulatory system
b. Oviparity and viviparity
c. Direct and indirect development