Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Discuss about discovery of phytochromes.

Given reasons : Food chains do not exist in isolation, but are always interconnected to form food web.

Name the type of interaction seen in each of the following examples:

1. Ascaris worms living in the intestine of human.
2. Wasp pollinating fig inflorescence.
3. Clown fish living among the tentacles of sea-anemone.
4. Mycorrhizae living on the roots of higher plants.
5. Orchid growing on a branch of a mango tree.
6. Disappearance of smaller barnacles when Balanus dominated in the Coast of Scotland.

What are the three main types of niches?

Community Service department of your school plans a visit to a slum area near the school with an objective to educate the slum dwellers with respect to health and hygiene.

1. Why is there a need to organize such visits?
2. Write the steps you will highlight, as a member of this department, in your interaction with them to enable them to lead a healthy life.

1. When and where did Neanderthal man live?
2. What was his brain capacity?
3. Mention the advancements he showed over Homo erectus.

1. Write two differences between Homo erectus and Homo habilis.
2. Rearrange the following from early to late geologic periods:

Carboniferous, Silurian, Jurassic.

Given below is a graph depicting organismic response to changing external conditions. According to their response the organisms are grouped into two types. Name the type which will show (i) Pattern A (ii) Pattern B.

Mention the role of the following in E.coli cloning vector pBR 322.

1. Selectable marker.
2. ori.
3. rop.

Since your earlier school days you have been solving mysteries/puzzles labelled as use your brain power. Did you ever wonder why human brain has such a capacity? Why and how we evolved along these lines? What is the extent of similarity between humans, chimpanzees and monkeys?