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

What is hibernation? Describe winter sleep (hibernation).

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?

Give answer for the following:

1. Female pelvis is larger and has a broader front than male pelvis. Why?
2. Name the different curves of vertebral column.
3. What is a seasmoid bone? Name it.
4. Which bones have become modified to form ear ossicles?

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?

Draw a diagram of alimentary canal of cockroach and label any six parts in it. (Description is not required)

Distinguish between a Bird and Bat.

Endoparasites are found inside the host body. Mention the special structure, possessed by these and which enables them to survive in those conditions.

Why renal portal system is absent in mammals?

What is:
i. blood,
ii. Serum?

Kritika's biology teacher explained the different phases of plant growth in her class. She taught that growth of plants takes place in three successive steps or phases from germination to maturation phase. Kritika reached home and asked her elder sister, a biology post-graduate student to clarify the phases in detail. Kritika's sister told her that she will explain the complete process with the help of experimentation. She took few seeds of pea and germinated them on a circular filter paper, soaked with water in a petri-dish. After two days of growth, she picked up a couple of seedlings with straight radicle and marked it from tip to base with the help of a waterproof ink and again placed the seedlings on moist filter paper to allow them to grow.

1. Mention different phases of growth in plants?
2. List the conditions required for growth.
3. What values are reflected from nature of Kritika's sister?