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प्रश्न
State whether the following statement is true or false. Explain your statement.
Tomato wilt is a viral disease.
सत्य या असत्य
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उत्तर
This statement is true.
Explanation:
- In Australia, the tomato wilt disease was first identified in 1919.
- Later, it was found that the tomato-spotted wilt virus is responsible for the disease's spread.
- The disease causes leaves to turn from green to yellow-brown colour.
- As they begin to droop, the leaves' shapes change.
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क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
संबंधित प्रश्न
Match the pairs.
| ‘A’ group | ‘B’ group | ||
| a. | Xylitol | 1. | Pigment |
| b. | Citric acid | 2. | To impart sweetness |
| c. | Lycopene | 3. | Microbial restrictor |
| d. | Nycin | 4. | Protein binding emulsifier |
| 5. | To impart acidity | ||
Give scientific reasons.
Use of mutant strains has been increased in industrial microbiology.
Find out my partner:
| A | B |
| Fungi | Chlorella |
| Protozoa | Bacteriophage |
| Virus | Candida |
| Algae | Amoeba |
| Bacteria | Prokaryotic |
Who am I?
I have a nucleus and membrane-bound cell organelles.
Who am I?
I reproduce mainly by cell division.
Who am I?
I can produce my replica.
Arrange the following in ascending order of size Bacteria, Fungi, Viruses, Algae.
What are micro-organisms?
How disease causing microorganisms enter into human beings?
Match the names of scientists given in Column A with the discovery made by them given in Column B.
| Column A | Column B |
| (a) Louis Pasteur | (i) Penicillin |
| (b) Robert Koch | (ii) Anthrax bacterium |
| (c) Edward Jenner | (iii) Fermentation |
| (d) Alexander Fleming | (iv) Small pox vaccine |
| (v) Typhoid |
