Which one of the following in not correctly matched?
Correct Answer:
(D)
Sugarcane - Powdery mildew
Powdery mildew is related with wheat, grape, barley, onion, apple and pea etc. not with sugarcane. Other pairs are correctly matched.
Ques:
2
Which one of the following is not correctly matched?
Crop Disease
Correct Answer:
(A)
Rice Green hair
Green hair disease is found in bajra. The symptom of green hair disease is the hairs of bajra becomes twisted. Green leaves and the hairs of bajra seems like a broom, as a result the plants remains dwarf. Rest of the options are correctly matched.
Ques:
3
Two common fungal diseases of wheat are :
Correct Answer:
(A)
Black rust & smut
Two common fungal diseases of the wheat crop are black rust and loose smut. Black rust of wheat is caused by Puccinia graminis tritici and loose smut of wheat is caused by Ustilago nuda tritici.
Ques:
4
Consider the following:
Birds
Dust blowing
Rain
Wind blowing
Which of the above spread plant diseases?
Correct Answer:
(D)
1, 2, 3 and 4
Plant Pathology (also Phytopathology) is the scientific study of plant diseases caused by pathogens and environmental conditions (physiological factors). These factors include - wind, rain, animals, soil, nursery graft, contaminated equipment and tools, infected seed stock, pollen, dust storm, irrigation water, birds and humans.
Ques:
5
What causes ‘Blackheart’ in potato?
Correct Answer:
(C)
Oxygen deficiency
Blackheart is an abiotic disease which is caused due to low availability of oxygen during storage of potato.
Ques:
6
Match List-I with List-II and select the correct answer from the code given below the lists.
List-I List-II
(Plant hormone) (Function)
Correct Answer:
(B)
Gibberellin 2. Cell division
The correctly matched lists of plant hormones and their functions are as follows:
List-I List-II
(Plant hormone) (Function)
Auxin - Apical dominance
Gibberellin - Cell elongation
Cytokinin - Cell division
Abscisic acid - Growth inhibition
Ques:
7
The gas used in the artificial ripening of green fruit is:
Correct Answer:
(A)
Acetylene
Under prevention of food adulteration rule, 1955 (Clause 44AA) acetylene gas cannot be used in the ripening of fruits. Calcium carbide is used in some countries as a source of acetylene gas, which is an artificial ripening agent. However, acetylene is not nearly as effective as ethylene and is not a natural plant hormone like ethylene. Also, calcium carbide may contain traces of arsenic and phosphorus, both highly toxic to humans and the use of this chemical for ripening is illegal in most countries. Ethylene has been found not harmful or toxic to humans in the concentrations found in ripening rooms.
Ques:
8
It is possible to produce seedless tomato fruits by:
Correct Answer:
(C)
Spraying hormones on flowers
Parthenocarpy is also desirable in fruit crops that may be difficult to pollinate or fertilize, such as tomato and summer squash. When sprayed on flowers, any of the plant hormones gibberellin, auxin and cytokinin could stimulate the development of parthenocarpy (seedless) fruit. This is termed artificial parthenocarpy.
Ques:
9
Which of the following statements is/are correct regarding vegetative propagation of plants?
Vegetative propagation helps in eliminating the virus.
Vegetative propagation can be practiced most of the year.
Select the correct answer using the code given below.
Correct Answer:
(C)
1 and 3 only
Vegetative or clonal propagation is an asexual reproduction in which successive mitosis of specialized vegetative propagules (as bulbs, corms, tubers, cuttings, buds and apomictic seeds) develop new plants and results in a clonal population. Therefore statement 1 is correct. Viruses are transmitted from plant to plant in a number of ways such as vegetative propagation. Viral diseases could be transferred through vegetative parts. So, the statement 2 is incorrect. Vegetative propagation can be practiced most of the year. Hence, statement 3 is correct.
Ques:
10
The practice of Gootee in plants is used for the purpose of:
Correct Answer:
(B)
For vegetative propagation
Gootee in plants is a method of vegetative propagation of plants that requires the rooting of aerial stems when connected to the parent plant. It is also named as air layering, marcotting, pot layerage, marcottage and circum-position.