Plant Diseases and their Control MCQs and Answers

Are you looking for Plant Diseases and their Control MCQs and Answers for medical entrance examinations? If yes, these are some most important multiple choice questions and answers on NCERT Class-12 Biology, Chapter-9 (Strategies for Enhancement in Food Production).

Here we composed these Plant Diseases and their Control MCQs and Answers after reading the chapter on Strategies for Enhancement in Food Production from the NCERT book on Class 12 Biology. The questions are topics-wise and the students can relate the questions easily to the most important topics of this chapter.

Plant Diseases and their Control MCQs and Answers

1. Which of the following is not a method by which pathogens affect the yield of crops?

a) Reduce the quantity of yield

b) Reduce the quality of crop produce

c) Increase in cost production

d) Increase the flowering period

Answer: d


2. Which of the following is not a method of the perpetuation of disease by the pathogen?

a) The entry of pathogen through natural openings

b) Reproduction by pathogen

c) Reducing the quantity of yield

d) Direct penetration of the pathogen

Answer: c


3. Which of the following is not a method of reducing total biomass of crop?

a) Damage to leaf tissues

b) Studying the crop

c) Killing branches

d) Stunting effect

Answer: b


4. Which of the following is not related to Necrosis?

a) Curling of leaves

b) Death of tissues

c) A common symptom of fungal diseases

d) Discolouration of leaves

Answer: a


5. Necrosis cannot be in the form of _________

a) Lesions

b) Scabs

c) Cankers

d) Rots

Answer: d


6. Which of the following is not related to Rots?

a) Discolouration of tissue

b) Degeneration of succulent tissue

c) Distortion of leaves

d) It is of two types

Answer: c


7. Which of the following is not true regarding Chlorosis?

a) Yellowing of leaves

b) Death of plant tissues

c) Non-formation of chlorophyll

d) Destruction of chlorophyll

Answer: b


8. Which of the following is not a common symptom of plant disease?

a) Necrosis

b) Leaf curls

c) Perfect flowering

d) Chlorosis

Answer: c


FAQs on Plant Diseases and their Control

Q1. What are the most common plant diseases?

Answer: The most common plant diseases include powdery mildew, botrytis, black spot, and rust. These can be caused by fungi, bacteria, or viruses, and can often be controlled with the help of fungicides, insecticides, or other chemicals.

Q2. How can I prevent plant diseases?

Answer: The best way to prevent plant diseases is to start with healthy plants and to keep your growing environment clean and free of debris. You should also avoid overwatering, as this can create the perfect conditions for fungi to thrive.

Q3. If I spot plant disease, what should I do?

Answer: If you spot plant disease, the first thing you should do is isolate the affected plant from the rest. This will help to prevent the disease from spreading. You can then try to treat the plant with chemicals, or you can remove and destroy the affected parts of the plant.

Q4. What are the natural methods of controlling plant diseases?

Answer: There are a number of natural methods of controlling plant diseases, including the use of beneficial fungi and bacteria, plants that repel pests, and companion planting. You can also try to encourage beneficial insects, such as ladybugs, to your garden, as they will help to keep pests under control.

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