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Agriculture - 3 (B.Sc. Agriculture)

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Which of the following is not an essential mineral element for plants?

  1. Potassium

  2. Magnesium

  3. Calcium

  4. Lead


Correct Option: D
Explanation:

Lead is not an essential mineral element for plants. 

If photosynthesis proceeds for an hour in atmosphere with radioactive carbon dioxide, then the labelled carbon will be mostly found in

  1. sugar

  2. starch

  3. both sugar and starch

  4. phosphoglyceralaldehyde


Correct Option: C
Explanation:

Exclusive photosynthesis for about an hour will lead to the formation of both sugar and starch. Hence, labelled carbon will be found in these forms together.

Which of the following is not a rabi crop?

  1. Wheat

  2. Paddy

  3. Pea

  4. Mustard

  5. Linseed


Correct Option: B
Explanation:

Paddy is a kharif crop. 

High rainfall, abundant sunshine, gently sloping land and well drained soil are suitable conditions for

  1. jute

  2. rice

  3. sugarcane

  4. tea


Correct Option: D

Which of the following statements is true for C4 plants?

  1. Grana is present in mesophyll cells and absent in bundle sheath cells.

  2. Grana is absent in mesophyll cells and present in bundle sheath cells.

  3. Grana is present in both mesophyll and bundle sheath cells.

  4. Grana is absent in both mesophyll and bundle sheath cells.


Correct Option: A
Explanation:

Chloroplasts of the mesophyll cells contain grana, whereas bundle sheath chloroplasts are almost devoid of grana.

What is the botanical name of sunflower?

  1. Tulip

  2. Helianthus

  3. Snow berry

  4. Rosa


Correct Option: B

Which of the following countries is the largest producer of soyabean?

  1. USA

  2. India

  3. Canada

  4. Bangladesh


Correct Option: A

The best soil for growing cotton is

  1. black soil

  2. clayey soil

  3. loamy soil

  4. mountain soil


Correct Option: A

What is the chromosome number of the fern Ophioglossum reticulatum which has the highest known chromosome number?

  1. 1001

  2. 500

  3. 2050

  4. 1260


Correct Option: D
Explanation:

Ophioglossum has the highest chromosome count of any known living organism.

Which of the following states is the leading producer of mustard in India?

  1. Tamil Nadu

  2. Rajasthan

  3. Haryana

  4. Gujarat


Correct Option: B
Explanation:

 Rajasthan is the correct answer. 

Which of the following is a helical virus?

  1. TMV

  2. Polio virus

  3. Herpes virus

  4. Vaccinia virus


Correct Option: A

Which of the following statements is incorrect for Agaricus?

  1. The cells of opposite strains show somatogamy to form the dikaryotic mycelium.

  2. Hyphae are interwoven into thick cords known as Rhizomorphs.

  3. Agaricus is a genus of mushrooms containing only edible species

  4. Clamp connections are observed.


Correct Option: C
Explanation:

 Agaricus is a genus of mushrooms containing both edible and poisonous species

The botanical name of watermelon is

  1. Prunus ariculatum

  2. Cencrus graseolata

  3. Melonjana pubescens

  4. Citrullus lanatus


Correct Option: D
Explanation:

Citrullus lanatus is the scientific name of watermelon.

What is a flower bud?

  1. A closed flower after blooming

  2. A dead flower before blooming

  3. An open flower after blooming

  4. A closed flower before blooming


Correct Option: D
Explanation:

A closed flower before blooming

True fruit develops from the ovary, but false fruit develops from flora parts such as

  1. corolla

  2. androecium

  3. ovary

  4. calyx


Correct Option: D
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