Which of the folowing is a symbiotic nitrogen fixer?

  •  Glomus

  •  Azotobacter

  •  Frankia

  •  Azolla

About 98 percent of the mass of every living organism is composed of just six elements

including carbon, hydrogen, nitrogen, oxygen and:

  • phosphorus and sulphur

  • sulphur and magnesium

  • magnesium and sodium

  • calcium and phosphorus

Which one of the following elements is not an essential micronutrient for plant growth?

  • Mn

  • Zn

  • Cu

  • Ca

A plant requires magnesium for

  • holding cells together

  • protein synthesis

  • chlorophyll synthesis

  • cell wall development

Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?

  • Frequent irrigation of the crop

  • Treatment of the palnts with cytokinins alongwith a small dose of nitrogenous fertilizer

  • Removal of all yellow leaves and spraying the remaining green leaves with 2, 4, 5 trichlorophenoxy acetic acid

  • Application of iron and magnesium to promote synthesis of chlorophyll

Sulphur is an important nutrient for optimum growth and productivity in:

  • pulse crops

  • cereals

  • fibre crops

  • oilseed crops

The function of leghaemoglobin is

legumes

  • to provide oxygen to leg muscles of nitrogen-fixing

  • to protect oxygen-sensitive enzymes of nitrogen fixing bacteria in the root nodules of

  • to walk to the sites where oxygen is required

  • to function when haemoglobin is not available.

Hydroponics is

  • cultivation of plants in water

  • growth of plants towards water

  • growth of plants away from water

  • soilless cultivation of plants

The function of leghaemoglobin during biological nitrogen fixation in root nodules of legumes is to

  • convert atmospheric N2 to NH3
  • convert ammonia to nitrite
  • transport oxygen for activity of nitrogenase
  • protect nitrogenase from oxygen.

Which of the following is correct set of micronutrient for plants?

  • Mg, Si Fe, Cu Ca

  • Cu, Fe, Zn, B, Mn

  • Mg, Fe, Zn, B, Mn

  • Mo, Zn, Cl, Mg, Ca

Which one of the following is not a microelement for plants?

  • Cu

  • B

  • Zn

  • Cr

Leghaemoglobin is produced in response to

  • respiration 

  • photosynthesis

  • fatty acid synthesis

  • N2 fixation.

Plants do not get benefit from

  • N2 in air

  • O2 in air

  • CO2 in air

  • O3 in air.

Which of the following set of elements are essential for the photosynthesis to occurs

  • Cu, Co, Fe

  • Cu, Mo, Zn

  • Mg, Co, Mn

  • Mg, Fe, Mn, Cu, Cl, P

Which enzyme complex is responsible for the reduction of molecular nitrogen to the level of NH3 in

root module of legume?

  • Aminase

  • Nitrogenase

  • Nitrate reductase

  • Nitrite reductase

Julius Von Sachs
Which of the following is not related?

  • A prominent German Botanist

  • In 1860, he demonstrated for the first time that plants could be grown to maturity in a defined nutrient solution in complete absence of soil
  • The technique, Hydroponics
  • Categorized the essential and non Essential mineral nutrition.

Hydroponics can be used in

  • Identification of essential elements

  • In discovery of deficiency symptoms of essential elements

  • For commercial production of vegetables

  • All of these

Hydroponics cannot be used in the commercial production of vegetables such as

  • Tomato

  • Seedless cucumber

  • Lettuce

  • Pomegranate

Which of the following is the essential requirement of Hydroponics?

  • Aeration to obtain the optimum growth

  • Lage vessel

  • Broader neck

  • Cotton plugs for funnel adjustment

How many elements are found in plants?

  • 105

  • 35

  • 44

  • More than 60

Which of the following is not a criteria for the essentiality of an element?

  • The element must be absolutely necessary for supporting normal growth and reproduction

  • In the absence of element, the plant is not able to complete their life cycle or set the seeds

  • The requirement of that element must be specific can be replacable by another element

  • The element must be directly involved in metabolism

The elements are classified into Macronutrients and Micronutrients based on their

  • Qualitative properties

  • Structural properties

  • Quantitative requirements

  • Both B and C

Which of the following can be a Macronutrient?

  • N

  • O

  • H

  • All of these

Which of the following cannot be Macronutrient?

  • P

  • S

  • K

  • Mn

Which of the following Macronutrient is absorbed from soil as mineral nutrition?

  • P

  • C

  • H

  • O

Micronutrients are found in

  • More than 10mmole per Kg of dry matter

  • Less than 10mmole per Kg of dry matter

  • Around 1mmole per Kg of dry matter

  • Less than 1mmole per Kg of dry matter

Which of the following cannot be a Micronutrient?

  • Cu

  • Mn

  • Zn

  • K

The option which doesn't carry at least one Micronutrient is

  • Fe,Mn,Mg

  • P,S,K

  • C,N,Zn

  • B,Cl,Ni

Which of the following is Macronutrient?

  • B

  • Cl

  • Ni

  • Mg

The Micronutrients can be

  • Mo

  • Mg

  • H

  • C

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Practice Botany Quiz Questions and Answers