Human Reproduction — BIOLOGY STD 12 Science — Question

Answer the following questions:
Why is tender coconut considered a healthy source of nutrition?

Describe the initiation process of transcription in bacteria.

How do snails, seeds, bears, zooplanktons, fungi and bacteria adapt to conditions unfavourable for their survival?

Study the diagram given below:

Name the linkages X, Y, Z and the respective molecules formed by them.

Egrets are often seen along with grazing cattle. How do you refer to this interaction? Give reason.

A plant with red flowers was crossed with another plant with yellow flowers. If F₁ showed all flowers orange in colour, explain the inheritance.

1. Identify (A) and (B) illustrations in the following:

1.  

2.  

2. Write the term given to (A) and (C) and why?
3. Expand PCR. Mention its importance in biotechnology.

Given below is the representation of amino acid composition of the relevant translated portion of b-chain of haemoglobin, related to the shape of human red blood cells.

Who are likely to suffer more from the defect related to the gene represented the males, the females or both males and females equally? And why?

Shubham was taught in the biotechnology class about the production of recombinant protein with the help of bioreactor. He was surprised by this new information. In the evening he discussed it with his elder brother, who is a biotechnologist. He smiled and explained him in detail.

1. What is recombinant protein?
2. Why is bioreactors useful in industries?
3. What are the values shown by Shubham?

Study the following diagram, and answer these questions:

1. Why does a wide arrow point from both producers and consumers to decomposers?
2. Why does a wide arrow point only from inorganic nutrient pool to producers?
3. Why don't the wavy arrows point from decomposers to producers?