Biotechnology: Principles and Processes — BIOLOGY STD 12 Science — Question

Besides better aeration and mixing properties, what other advantages do stirred tank bioreactors have over shake flasks?

Identify a, b, c, d, e and f in the table given below:

S. No.	Organism	Bioactive molecule	Use
A.	Monascus purpureus (yeast)	a	b
B.	c	d	antibiotic
C.	e	Cyclosporin A	f

An organic farmer relies on natural predation for controlling plant pests and diseases. Justify giving reasons why this is considered to be a holistic approach.

When a cross is made between tall plant with yellow seeds (TtYy) and tall plant with green seeds (Ttyy), what proportions of phenotypes in the offsprings could be expected to be:
(i) tall and green
(ii) dwarf and green

ion the characteristic symptoms of Dengue fever. How is the disease transmitted to others?

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.

What difference would be noticed in the phenotype of the normal and the sufferer related to this gene?

Explain any three advantages the seeds offer to angiosperms.

Name the stage ofthe Plasmodium thall is trrnsmitted to human body by the vector. Describe the life cycle of the plrasite in humans.

OR

Trace the life cycle of Plasmodium in humans from the stage of entry, until it is picked up by the female Anopheles.

As a senior biology student you have been asked to demonstrate to the students of secondary level in your school, the procedure(s) that shall ensure cross-pollination in a hermaphrodite flower. List the different steps that you would suggest and provide reasons for each one of them.

Give reason:

1. Population of different species are not capable of breeding with each other.
2. Intraspecific competition is more intense than interspecific competition.
3. Parasites tend to loose certain organs.