Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice plant diseases keeping diseases away biology

On the basis of symptoms of chlorosis in leaves a student inferred that this was due to deficiency of nitrogen. This inference could be correct only if we assume that yellowing of leaves appeared first in.

  1. Old leaves

  2. Young leaves

  3. Young leaves followed by mature leaves

  4. Mature leaves followed by young leaves
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • On the basis of the symptoms of chlorosis in the leaves, a student inferred that this was due to the deficiency of nitrogen. 
  • This may be correct inference only if yellowing of leaves appeared first in young leaves then in old leaves. But Chlorosis is the main symptom of nitrogen deficiency. 
  • Therefore, the leaves gradually become pale or yellow. These will first appear in old leaves and then in young leaves.
  • The correct option is A.

Multiple choice plant diseases keeping diseases away biology

An Albugo caused disease in which pustules on the surface of leaves, stem inflorescence and floral parts along with various type of deformities of which, hypertrophy is most pronounced, are the characteristic symptoms of ___________________.

  1. Yellow stripe rust of wheat

  2. White rust of mustard

  3. Yellow ear rot and ear cockle of wheat

  4. Udbatta disease of rice
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

White rust of mustard is caused by the oomycete Albugo candida, characterized by white blister-like pustules and pronounced hypertrophy and deformation of infected plant parts.

Multiple choice plant diseases keeping diseases away biology

Which one of the following statements is not correct?

  1. The bunt of rice is found only in southern India

  2. The pathogen of the stem rot of rice belongs to Deuteromycetes.

  3. The blast disease of rice affects the crop in all stages

  4. In the brown spot disease of rice all parts of the plant are infected exept roots.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The bunt of rice is not restricted to southern India; it is found in various rice-growing regions. The other statements are generally accepted facts in plant pathology.

Multiple choice plant diseases keeping diseases away biology

Which one of the following types of organisms causes the disease Potato Witches broom?

  1. Virus

  2. Mycoplasma

  3. Fungus

  4. Bacteria
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Potato Witches broom is a phytoplasmal disease (caused by phytoplasma, formerly grouped under Mycoplasma-like organisms) characterized by excessive proliferation of shoots.

Multiple choice plant diseases keeping diseases away biology

The foul fishy smell of a volatile chemical trimethylamine in the disease infested wheat field is an indicator of ____________.

  1. Rust

  2. Smut

  3. Blast

  4. Bunt
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Bunt of wheat, caused by Tilletia species, produces teliospores that release trimethylamine, giving off a characteristic foul fishy odor in infested fields.

Multiple choice plant diseases keeping diseases away biology

With reference to the introduction of plant disease into India from other countries, consider the following pairs.
a. Bunchy top of banana- Ceylon(Sri Lanka)
b. Potato tuber moth- Italy
c. Flag sumut of wheat- Fiji
Which of the pairs is/are correctly matched?

  1. $1$ and $2$ only
  2. $2$ only
  3. $1$ and $3$ only
  4. $1, 2$ and $3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bunchy top of banana was introduced from Sri Lanka (1), and the Potato tuber moth was introduced from Italy (2). Flag smut of wheat was not introduced from Fiji.

Multiple choice plant diseases keeping diseases away biology

Leaf hopper which acts as a vector in. The transmission of Tungro virus disease of rice is?

  1. Sagatella orizicola

  2. Inazuma dorsalis

  3. Nilaparvata lugans

  4. Nephotettix impicticeps
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Nephotettix impicticeps is the known green leafhopper vector responsible for transmitting the Tungro virus disease in rice crops.

Multiple choice plant diseases keeping diseases away biology

Match List I(Name of plant disease) with List II(Name of Pathogen) and select the correct answer.

List-I List-II
a. Angular leaf spot of cotton $1$. Phytophora infestans
b. Late blight of potato $2$. Colletotrichum falcatum
c. Red rot of sugarcane $3$. Cercospora personata
d. Tikka leaf spot of groundnut $4$. Xanthornonas malvacearum
  1. A-$3$, B-$1$, C-$4$, D-$2$
  2. A-$4$, B-$1$, C-$2$, D-$3$
  3. A-$3$, B-$4$, C-$2$, D-$1$
  4. A-$4$, B-$2$, C-$1$, D-$3$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Matching the plant diseases to their pathogens: Angular leaf spot of cotton is caused by Xanthomonas malvacearum (A-4), Late blight of potato by Phytophthora infestans (B-1), Red rot of sugarcane by Colletotrichum falcatum (C-2), and Tikka leaf spot of groundnut by Cercospora personata (D-3). This corresponds to option B.

Multiple choice plant diseases keeping diseases away biology

Which one of the following complexes is responsible for the cause of Tundu disease in wheat?

  1. Fungus-nematode

  2. Nematode-bacterium

  3. Fungus-bacterium

  4. Virus-fungus
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Tundu disease of wheat is a composite disease caused by a combination of the seed gall nematode (Anguina tritici) and the bacterium (Clavibacter tritici) working together as a disease complex.

Multiple choice plant diseases keeping diseases away biology

The disease little leaf of fruit trees is caused by the deficiency of ______________.

  1. Copper

  2. Zinc

  3. Manganese

  4. Cobalt
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Little leaf of fruit trees is a well-known physiological disorder caused by a deficiency of zinc in the soil and plant tissues. Zinc plays a crucial role in auxin synthesis, which directly affects leaf expansion and internode elongation.