Question bank

Filter questions by subject, topic and difficulty. Open any question to answer it and see the explanation.

Clear

249 questions found · practise this subject as a set Show 20 · 50 per page

#	Question	Subject and topic	Difficulty
41	Grain yield in wheat is an example of a:	Agriculture Quantitative inheritance	Easy
42	In Nilsson-Ehle's wheat kernel colour cross with two gene pairs, the F₂ ratio was:	Agriculture Quantitative inheritance	Medium
43	If a trait is controlled by three additive gene pairs, what fraction of the F₂ resembles one extreme parent?	Agriculture Quantitative inheritance	Hard
44	Discontinuous variation is typical of characters that are:	Agriculture Quantitative inheritance	Easy
45	How many phenotypic classes are expected in the F₂ when a trait is controlled by four additive gene pairs?	Agriculture Quantitative inheritance	Medium
46	The proportion of observed variation in a trait that is due to genetic differences is called:	Agriculture Quantitative inheritance	Medium
47	Triticale, the first man-made cereal, was developed by crossing:	Agriculture Plant breeding: history, objectives and methods	Easy
48	The chemical commonly used to double the chromosome number in plants is:	Agriculture Plant breeding: history, objectives and methods	Easy
49	Pure-line selection is best suited to:	Agriculture Plant breeding: history, objectives and methods	Medium
50	The superiority of an F₁ hybrid over both its parents is called:	Agriculture Plant breeding: history, objectives and methods	Easy
51	A breeder wants to transfer a single disease-resistance gene into an otherwise excellent variety. The most su…	Agriculture Plant breeding: history, objectives and methods	Hard
52	Virus-free plants can be obtained through tissue culture of the:	Agriculture Plant breeding: history, objectives and methods	Medium
53	The bacterium used as a natural vector to transfer genes into plants is:	Agriculture Plant biotechnology	Easy
54	The insect-killing gene in Bt cotton is obtained from:	Agriculture Plant biotechnology	Easy
55	Golden Rice was developed to increase the content of:	Agriculture Plant biotechnology	Medium
56	Enzymes that cut DNA at specific base sequences are called:	Agriculture Plant biotechnology	Medium
57	Selecting plants for a desired gene by testing their DNA rather than their appearance is called:	Agriculture Plant biotechnology	Hard
58	What is the pH of a solution whose hydrogen ion concentration is 10⁻⁵ mol/L?	Agriculture pH and buffers	Easy
59	A solution of pH 3 has how many times more hydrogen ions than a solution of pH 4?	Agriculture pH and buffers	Medium
60	Which pair can form a buffer solution?	Agriculture pH and buffers	Easy