Sexual Reproduction in Flowering Plants — BIOLOGY STD 12 Science — Question

A forest hardly has any carnivores. Census of herbivorous mammals was taken and plotted as a graph shown below:

Identify the curve that will explain the population growth of herbivores. Give reasons for your answer.

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.

1. Is this representation indicating a normal human or a sufferer from certain related genetic disease? Give reason in support of your answer.
2. What difference would be noticed in the phenotype of the normal and the sufferer related to this gene?
3. Who are likely to suffer more from the defect related to the gene represented – the males, the females or both males and females equally? Andwhy?

What is triple fusion? Where and how does it take place? Name the nuclei involved in triple fusion.

Explain why children eating golden rice are unlikely to suffer from 'night blindness'?

In ecosystem the movement of nutrients is called cycling while the term 'flow' used for energy. Why?

Name the tissue which lines the inner surfaces of fallopian tube.

Study the figure given below and answer the following questions.

1. Name the molecule 'X' synthesised by i gene. How does this molecule get inactivated?
2. Which one of the structural genes codes for B-galactosidase?
3. When will the transcription of this gene stop?

What is meant by biological evolution?