Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

Multiple choice botany photosynthesis action spectrum and absorption spectrum spectrum of electromagnetic radiation chloroplast and pigments of photosynthesis

Electromagnetic radiation with wavelengths between 0.4 and 0.7 micrometers is called:

  1. Ultraviolet light

  2. Visible light

  3. Infrared light

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

The visible spectrum of electromagnetic radiation ranges from approximately 0.4 micrometers (violet) to 0.7 micrometers (red).

Multiple choice botany photosynthesis action spectrum and absorption spectrum spectrum of electromagnetic radiation chloroplast and pigments of photosynthesis

If the oxygen of $CO _2$ is radiolabelled and provided to the plant, then which of the following will show radioactivity in the cells exposed to sunlight?

  1. Hexose
  2. $H _2O$
  3. $O _2$

  4. GTP
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In photosynthesis, the carbon from CO2 is incorporated into glucose (a hexose sugar). If the carbon in CO2 is radiolabeled, the resulting hexose will show radioactivity.

Multiple choice botany mineral nutrition in plants deficiency diseases and symptoms deficiency symptoms macronutrients and micronutrients

Chlorosis, i.e., loss of chlorophyll leading to yellowing in leaves, is caused by the deficiency of 

  1. N, K, Mg

  2. S, Fe, Zn

  3. Mn, Mo, Mg

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Chlorosis is a symptom caused by the deficiency of various essential mineral elements, including Nitrogen, Potassium, Magnesium, Sulfur, Iron, Zinc, Manganese, and Molybdenum, which are all required for chlorophyll synthesis or stability.

Multiple choice botany mineral nutrition in plants deficiency diseases and symptoms deficiency symptoms macronutrients and micronutrients

While in N, K and Mg deficiency, chlorosis appears first in _____ leaves; in S and Ca deficiency,_____ leaves are the first to be affected.

  1. Young, old

  2. Old, young

  3. Old, old

  4. Young, young
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Elements like N, K, and Mg are mobile in plants, so they are transported to young leaves when deficient, causing symptoms to appear first in old leaves. S and Ca are relatively immobile, so deficiency symptoms appear first in young leaves.

Multiple choice botany mineral nutrition in plants deficiency diseases and symptoms deficiency symptoms macronutrients and micronutrients

Deficiency symptoms of radially mobilised essential elements will first appear in _________

  1. Younger tissues

  2. Older tissues

  3. Roots

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

When essential elements are mobile (radially or systemically), the plant redistributes them from older tissues to younger, actively growing tissues. Therefore, deficiency symptoms for these elements appear first in older tissues.

Multiple choice botany mineral nutrition in plants deficiency diseases and symptoms deficiency symptoms macronutrients and micronutrients

Necrosis mainly occurs by the deficiency of  

  1. Ca, Mg

  2. N, S

  3. Mn, Mo

  4. Fe, Mn
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Necrosis, or the death of plant tissue, is commonly caused by the deficiency of minerals like calcium, magnesium, copper, and potassium. Among the choices, calcium and magnesium are well-documented elements whose deficiency leads to localized tissue death.

Multiple choice botany mineral nutrition in plants deficiency diseases and symptoms deficiency symptoms macronutrients and micronutrients

Premature leaf fall is due to deficiency of 

  1. Sodium

  2. Potassium

  3. Zinc

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

Premature leaf fall is a classic symptom of phosphorus deficiency in plants. Phosphorus is mobile within the plant, and its lack disrupts energy transfer and metabolic processes, leading to early senescence and abscission.