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: 2
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: 3
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: 4
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: 5
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.