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

Give the chromosomal constitution and the resulting sex in each of the following syndromes:
Turner’s syndrome.

What is trisomy? Give an example.

Find out through the internet and popular science articles whether animals other than man have self-consciousness.

Name the process of release of spermatozoa from Sertoli cells into cavity of seminiferous tubule.

Give names of two enzymes of DNA replication and write one specific function of each of them.

Name the plant source of the drug popularly called “smack”. How does it affect the body of the abuser?

OR

Name an opioid drug and its source plant. How does the drug affect the human body?

There is only one possible sequence of amino acids when deduced from a given nucleotides. But multiple nucleotides sequence can be deduced from a single amino acid sequence. Explain this phenomena

Arrange the following terms in the correct developmental sequence:
Pollen grain, sporogenous tissue, microspore tetrad, pollen mother cell, male gametes.

What is radioactive pollution? What are the sources of radioactive pollution?

Observe the global biodiversity distribution of the major plant taxa in the given diagram and answer the questions accordingly.

1. Which group of plants are the most endangered?
2. Why are mosses/ ferns so few? Give reason.
3. How do fungi that are heterotrophs sustain themselves as a large population? 
4. Which group of plants is most advanced and which one is most primitive?