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Agriculture - 6 (B.Sc. Agriculture)

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Which of the following is an essential micronutrient for plants?

  1. Potassium

  2. Nickel

  3. Calcium

  4. Phosphorus


Correct Option: B
Explanation:

Nickel is a micronutrient. Plants need micronutrients in concentrations of less than 100 milligrams per kilogram of their dry matter.

Light trapping reaction takes place in

  1. chloroplast

  2. grana

  3. lamella

  4. stroma


Correct Option: B
Explanation:

Light reaction occurs exclusively in grana.

Why does sunflower turn towards sunlight?

  1. To save itself from predators

  2. To make food

  3. To appear attractive

  4. To receive vitamin D

  5. To save its green leaves from sun rays


Correct Option: B
Explanation:

Sunflower turns towards sunlight to make food.

Which of the following organisms is used as a biofertiliser for raising soyabean crop?

  1. Nostoc

  2. Azotobacter

  3. Azospirillum

  4. Rhizobium


Correct Option: D
Explanation:

Soyabean is a legume which is associated symbiotically with Rhizobium.

Which of the following statements is incorrect about manure?

  1. Manure is prepared in fields.

  2. Manure is prepared in factories.

  3. Manure is obtained by decomposition of dung, animal wastes, etc.

  4. Manure provides humus to the soil.

  5. Manure is relatively less rich in plant nutrients as compared to fertilisers.


Correct Option: B
Explanation:

Manure is not prepared in factories. Fertilisers are prepared in factories.

The number of chromosomes can be increased or decreased by

  1. mutation

  2. endomitosis

  3. nondisjunction

  4. All of the above


Correct Option: C
Explanation:

During meiosis, chromosomes fail to separate, results in disbalancing of chromosome number.

The red soils develop a reddish colour due to

  1. deforestation and over–grazing

  2. the presence of potash and magnesia

  3. tropical monsoon climate

  4. a wide diffusion of iron in ancient crystalline


Correct Option: D

The binomial of hort staple cotton is

  1. Gossypium barbadense

  2. Hibiscus sabdaiffa

  3. Hibiscus rosa-sinensis

  4. Gossypium hirsutum


Correct Option: D
Explanation:

Gossypium hirsutum, also known as upland cotton or Mexican cotton, is the most widely planted species of cotton in the United States, constituting some 95% of all cotton production there.

Which of the following flowers is not used for medicinal purposes?

  1. Daffodil

  2. Clove

  3. Saffron

  4. Neem


Correct Option: A
Explanation:

Daffodil is an inedible flower. It is not used for making medicines.

Who isolated the tobacco mosaic virus in para crystalline form in the year 1935?

  1. Von Manuel

  2. Stanley

  3. Jack Karl

  4. Ronald Ross


Correct Option: B

Blast disease of rice is caused by

  1. Alternaria solani

  2. Entyloma oryzae

  3. Piricularia oryzae

  4. Helminthosporium oryzae


Correct Option: C

The botanical name of ‘toddy palm’ is

  1. Caryota urens

  2. Punica granatum

  3. Achras zapota

  4. Cydonia oblonga


Correct Option: A

______ is the fruit that develops from chambered monocarpellary superior ovary. The dry papery seed coat remains fused with the pericarp.

  1. Achene

  2. Cypsela

  3. Caryopsis

  4. Samara


Correct Option: C

The specific characteristic present in the leaves of C4 plants is the presence of

  1. bulliform cells

  2. parallel venation

  3. dimorphic chloroplasts

  4. stomata which open at night


Correct Option: C

In a mustard flower, all the petals are separated from each other. What is the flower called?

  1. Sepaloid

  2. Petaloid

  3. Gamopetalous

  4. Polypetalous

  5. Monopetalous


Correct Option: D
Explanation:

The flower whose petals are separated from each other is known as polypetalous.

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