Mention One Advantage and One Disadvantage to a Farmer Who Uses Them. - Biology


Mention one advantage and one disadvantage to a farmer who uses them.




The embryos produced through apomixis are generally free from infection.


An apomictic embryo develops to produce several embryos inside a seed, a condition called polyembryony, which may require a stimulus in pollination

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2014-2015 (March) All India Set 3

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With the help of a neat and labelled diagram explain VAM (vesicular arbuscular mycorrhizae).

Trichoderma konigi is a source of _______ enzyme.

(A) invertase

(B) lipase

(C) pectinase

(D) cellulase

Name the bioactive molecules produced by Trichoderma polysporum and Monascus purpureus.

How do mycorrhizae act as biofertilizers? Explain.

Given below is a list of six micro-organisms. State their usefulness to humans.
(a) Nucleopolyhedrovirus
(b) Saccharomyces cerevisiae
(c) Monascus purpureus
(d) Trichoderma polysporum
(e) Penicillium notatum
(f) Propionibacterium sharmanii

Name the type of association that the genus Glomus exhibits with higher plants.

Explain the significant role of the genus Nucleopolyhedrovirus in an ecological sensitive area.

What is VAM?

Name a genus of fungi that forms a mycorrhizal association with plants.

State the difference in organic farmers approach from that of conventional pest control methods.

Give reasons for the following:

Nitrogenous fertilizers are not applied in fields where leguminous crops grow.

Give two examples of microbial pesticides with their hosts.

Organic farmers prefer the biological control of diseases and pests to the use of chemicals for the same purpose. Justify

Answer the following question: 

Why are the spores of Bacillus thuringiensis used as bioinsecticide? 

Give the biological name of the following:

The microbe used to control insect larvae growing on cotton.

Give the biological name of the following: 

The fungus that is being developed as a bio-control agent.

Write a note on biocontrol agents.

Select the odd one from given herbicides.

What is mycorrhiza?

Match the column A with B and rewrite correct pairs

  A B
I Mycoherbicides Cactoblastis
II Bacterial herbicides Alternaria
III Insects as herbicides Xanthomonas

______ are controlled by the microbial herbicide Phytophthora palmivora.

Which of the following statements regarding biocontrol agents are correct?

Which of the following is TRUE regarding Bacillus thuringiensis?

Which of the following can be killed using Nosema locustae?

Which of the following is the INCORRECT statement with respect to biocontrol agents?

From the following which one is NOT a bacterial herbicide?

Identify the INCORRECT statement regarding Bacillus thuringiensis.

Which of the following is the INCORRECT statement?

Which group features jointed appendages?

Which one of the following statements is WRONG in relation to transgenic Bt cotton plant?

Farmers have reported over 50% higher yield of rice by using which of the following biofertilizers?

Name any genetically modified crop.

Many members of genus Glomus form a mycorrhizal association with plants. Elaborate how is this association beneficial to the plants.

Nucleopolyhedrovirus do not show ______.

Which of the following is incorrect regarding Bacillus thuringiensis?

give any two examples of microbial herbicides.

Explain how Bacillus thuringiensis acts as a bio-control agent.


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