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

What is meant by gestation period?

What are antibiotics? Name the classes of organisms that produce antibiotics

Identify giving reasons, the salient features of genetic code by studying the following nucleotide sequence of mRNA strand and the polypeptide translated from it.
AUG UUU UCU UUU UUU UCU UAG
Met - Phe - Ser - Phe - Phe - Ser

Teacher explains about the process of biofortification, in which he explains that, this method is useful in providing nutrition to large population. Akshay asked some question about this from his teacher.

1. What is biofortification?
2. What types of nutritional enrichment can be possible through this?
3. What is Atlas 66?
4. What values are shown by Akshay as biology student?

What is corona radiata?

Alien species are highly invasive and are a threat to indigenous species. Substantiate this statement with any three examples.

In peas, tallness is dominant over dwarfness, and red colour of flowers is dominant over the white colour. When a tall plant bearing red flowers was pollinated with a dwarf plant bearing white flowers, the different phenotypic groups were obtained in the progeny in numbers mentioned against them:
Tall, Red = 138
Tall, White = 132
Dwarf, Red = 136
Dwarf, White = 128
Mention the genotypes of the two parents and of the four offspring types.

What do you understand by Snow-blindness?

Name any two natural cloning vectors. Give reasons that make them act as cloning vectors. Write the two characteristics the engineered vectors are made to possess.

What is the study of fossils called? Mention any three points how the fossils throw light on the past.