Evolution — BIOLOGY STD 12 Science — Question

The method developed by Eli Lilly using R-DNA technology has received great support from diabetic patients. Explain, how?

Classify the following as examples of homology and analogy:

(i)	Mouth parts of cockroach and butterfly
(ii)	Hearts of rabbits and human beings
(iii)	Eyes of octopus and mammals
(iv)	Sweet potato and potato
(v)	Stings of honey bee and scorpion
(vi)	Tendrils of Lathyrus and tendrils of Gloriosa

How has the use of Agrobacterium as vectors helped in controlling Meloidegyne incognitia infestation in tobacco plants? Explain in correct sequence.

How is PCR technique beneficial in biotechnology? How are the developed countries related to biopiracy cases? Explain with an example.

In the figure, structure of an antibody molecule is shown. Name the parts A, B and C.

Show A, B and C in the diagram.

The study of:

1. Fossils of dinosaurs.
2. Forelimbs of Cheeta, bat and human.
3. Thorns of Bougainvillea and tendril of Cucurbita shows that evolution of life forms has indeed taken place on earth. Explain.

Kanchan went to a garden and saw some flowers which were closed. She assumed that those flowers must be buds. But she was astonished to see that all the flowers of that plant were closed and none of them was open. She was confused and asked her queries to her teacher.

1. What do you think, are there any plants with closed flowers? Give an example.
2. Are such plants get pollinated? Explain.
3. What are such flowers/ plants called?
4. What values are shown by Kanchan?

Where does fertilization take place in human female?

What is meant by gestation period?