Download App

Evolution — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYEvolution2 Marks
Question
What do you understand by spontaneous generation?
✓

Answer

Spontaneous Creation : According to this, life originated spontaneously from inanimate matter. This theory was propounded by Van Helmont. He said that by keeping sweat-soaked clothes and wheat straw together, rats are born in 21 days on the Nile River. When the sun's rays fall, life is created; frogs are formed in the soil; even today many people in India believe that scorpions are born from donkey urine and cow dung. This idea has been rejected by scientists now-a-days.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "2 Marks Questions" from Evolution→Evolution — all question types→BIOLOGY STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Following is the process of curd formation from milk.

Milk is incubated with curd

$\downarrow$

LAB grows in milk

$\downarrow$

(a) Production

$\downarrow$

Coagulation and digestion of milk protien

$\downarrow$

Improved nutritional quality by (b)
  1. What does (a) and (b) signifies in the flow chart.
  2. Expand the word LAB.
→
Write about the following :
(i) Genetic code has dual functions.
(ii) A segment of DNA coding for polypeptide.
(iii) Fragments of DNA joined by which enzyme.
→
Identify the types of flower shown in A and B. Which out of the two will produce an assured seed set.
→
Woman have more responsibility than man in the reproductive process. Why? Explain.
→
Biodiversity in living beings started about 3 billion years ago. Since then, new species are emerging on the earth and at the same time, their mass extinction is also taking place.
(a) How many phenomena of mass extinction have occurred on Earth and which extinction is in progress at present?
(b) How is the current phenomenon of extinction different from earlier occurrences and explain why.
→
Write two major functions each of testis and ovary.
→
Explain any two devices by which autogamy is prevented in flowering plants.
→
Type of microbe Scientific name Product Medical application
(i) Fungus a Cyclosporin b
(ii)c Monascus purepureus statin d
→
Mention a product of human welfare obtained with the help of the following microbes:
Saccharomyces cerevisiae.
→
Write the names of different species of Plasmodium. Which is the most deadly species among these and why?
→