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Mineral Nutrition · Question 46

AIPMT 2003MCQEasy📈 Topic in 25% papers+4−1
1

Plants deficient of element zinc, show its effect on the biosynthesis of plant growth hormone

  1. auxin
  2. cytokinin
  3. ethylene
  4. abscisic acid.

Answer

(1) auxin

Solution

Zinc is a micronutrient that activates various enzymes, especially carboxylases.

⇒ Zinc is needed for the synthesis of tryptophan, the precursor from which auxin (indole-3-acetic acid, IAA) is made.

∴ Zinc deficiency reduces auxin biosynthesis (seen as little leaf and rosette symptoms due to poor internode growth).

Answer: (1)

AIPMT 2003

Keep practising — Mineral Nutrition

2

Gray spots of oat are caused by deficiency of

  1. Cu
  2. Zn
  3. Mn
  4. Fe
Out of syllabusAIPMT 2003
3

Boron in green plants assists in

  1. activation of enzymes
  2. acting as enzyme co-factor
  3. photosynthesis
  4. sugar transport
Out of syllabusAIPMT 2003
4

Enzyme first used for nitrogen fixation

  1. nitrogenase
  2. nitroreductase
  3. transferase
  4. transaminase
AIPMT 2001
5

Passive absorption of minerals depends on

  1. temperature
  2. temperature and metabolic inhibitor
  3. metabolic inhibitor
  4. humidity
Out of syllabusAIPMT 2001
6

Roots of which plant contain a red pigment which has affinity for oxygen?

  1. Carrot
  2. Soybean
  3. Mustard
  4. Radish
Out of syllabusAIPMT 2001
7

Mg is a component of

  1. chlorophyll
  2. cytochrome
  3. haemoglobin
  4. haemocyanin
Out of syllabusAIPMT 2000
8

Plants take zinc in the form of

  1. ZnSO4
  2. Zn2+
  3. ZnO
  4. Zn
Out of syllabusAIPMT 2000
9

When the plants are grown in magnesium deficient but urea rich soil, the symptoms expressed are

  1. yellowish leaves
  2. colourless petiole
  3. dark green leaves
  4. shoot apex dies
Out of syllabusAIPMT 2000

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All NEET Botany chapters
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