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Botany - 3 (B.Sc. Agriculture)

Description: Botany - 3
Number of Questions: 15
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Tags: Botany - 3 Crop Improvement Seed Genetically Modified Organisms Mutation Herbaria Plant Diseases Binomial Nomenclature
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Which of the following is not a correct match?

  1. Root knot disease – Nematode Heterodera marioni

  2. Smut of bajra – Helminthosporium sacchari

  3. Covered smut of barley – Ustilago nuda

  4. Late blight of potato – Phytophthora infestans


Correct Option: C
Explanation:

Covered smut of barley is caused by Ustilago hordei.

Cytokinesis occurs in an animal cell by

  1. furrowing

  2. burrowing

  3. borrowing

  4. None of these


Correct Option: A
Explanation:

In cell biology, the cleavage furrow is the indentation of the cell's surface that begins the progression of cleavage, by which animal and some algal cells undergo cytokinesis, the final splitting of the membrane, in the process of cell division.

Which of the following is used to neutralise acidic soils for better plant growth?

  1. Water

  2. Sodium hydroxide

  3. Calcium oxide

  4. Sulphuric acid

  5. Dung


Correct Option: C
Explanation:

Calcium oxide is used to neutralise acidic soils. Calcium oxide is basic in nature and is reasonable.

_______ of water lead(s) to swelling of the seed.

  1. Imbibition

  2. Releasing

  3. Inhibition

  4. All of the above


Correct Option: A
Explanation:

Imbibition is a special type of diffusion when water is absorbed by solids-colloids, causing an enormous increase in volume. Examples include the absorption of water by seeds and dry wood.

The national herbarium of our country is located in the Indian Botanical Garden, which is located in

  1. Calcutta

  2. Ooty

  3. Bangalore

  4. Mumbai


Correct Option: A
Explanation:

 The national herbarium of our country is located in the Indian Botanical Garden, which is located in Calcutta.

The share of agriculture as a factor in India's GDP in 2006-07 was

  1. 17.5%

  2. 18.5%

  3. 19.5%

  4. 20.25%


Correct Option: B

Which of the following statements about genetically modified (GM) crop Bt-brinjal is/are incorrect?

I. The Genetic Engineering Approval Committee (GEAC) has approved its commercial cultivation. II. The Union Ministry of Environment and Forests has accepted the recommendations of the GEAC. III. Bt-brinjal is the first genetically modified (GM) food crop to have been granted approval by the GEAC.

  1. Only I

  2. Only II

  3. Only II and III

  4. Only I and III

  5. I, II and III


Correct Option: D
Explanation:

The government has yet to take a decision on the committee’s recommendations. If approved by the government, it will become the first GM food crop in India.

Which of the following is an example of point mutation?

  1. Sickle cell anaemia

  2. Down's syndrome

  3. Turner's syndrome

  4. Klinefelter's syndrome


Correct Option: A
Explanation:

Here, in beta globin chain of haemoglobin, glutamate is changed into valine.

Foot and mouth disease in cattles is caused by a

  1. bacterium

  2. fungus

  3. amoeba

  4. virus

  5. protozoan


Correct Option: D
Explanation:

Foot and mouth disease in cattles is caused by a virus.

At what stage of the vegetative growth of crops are weedicides sprayed in the fields?

  1. Before sowing seeds

  2. After flowering

  3. Just before harvesting

  4. Before flowering


Correct Option: D

The botanical name of sal is

  1. Pinnus roxburghii

  2. Tectona grandis

  3. Taxus buccata

  4. Shorea robusta


Correct Option: D
Explanation:

The botanical name is Shorea robusta.

The most poisonous mushroom is

  1. agaricus

  2. amanita

  3. pleurotus

  4. volvariella

  5. None of these


Correct Option: B
Explanation:

The most poisonous mushroom is amanita.

Directions: Choose the appropriate answer from the options given below.

______ is a mature ovule containing an embryo.

  1. Leaf

  2. Flower

  3. Fruit

  4. Seed


Correct Option: D
Explanation:

A seed is an embryonic plant enclosed in a protective outer covering.

Improper handling and storage of cereal grains and oilseeds results in the production of toxins known as aflatoxins which are not generally destroyed by normal cooking process. Aflatoxins are produced by

  1. bacteria

  2. protozoa

  3. moulds

  4. viruses


Correct Option: C
Explanation:

The fungus Aspergillus flavus produces toxic aflatoxin. This mould is found in soil and decaying vegetation. It is assumed that the products contaminated with aflatoxin are carcinogenic to humans.

The most common algal partner in lichens belongs to

  1. blue-green algae

  2. green algae

  3. red algae

  4. brown algae


Correct Option: B
Explanation:

 The most common algal partner in lichens belongs to green algae.

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