MHT-CET Paper 2016 Biology Version 22
Which of the following event does NOT lead into secondary succession?
(a) All organisms that existed are lost
(b) Where no living organisms ever existed
(c) Abandoned crop field
(d) Land affected by flood
b
A nucleosome along with linker DNA consists of _______
(a) eight molecules of histones and 146 base pairs
(b) eight molecules of histones and 200 base pairs
(c) nine molecules of histones and 146 base pairs
(d) nine moblecules of histones and 200 base pairs
d
During aerobic respiration the final electron acceptor is
(a) Cyto b
(b) NADH2
(c) Water
(d) Oxygen
d
In quantitative inheritance, when a character is controlled by two pairs of genes, the ratio obtained in F2 generation is ______
(a) 1 : 2 : 1
(b) 1 : 4 : 6 : 4 : 1
(c) 9 : 3 : 3 : 1
(d) 1 : 6 : 15 :20 :15 : 6 : 1
b
Which of the following is a character of Castor plant to avoid autogamy?
(a) Unisexuality
(b) Protogyny
(c) Protandry
(d) Heterostyly
a
During hybridization offsprings with hybrid vigour superir to both parents are self pollinated for few successive generations to _____
(a) retain their parental characters
(b) remove their parental characters
(c) get homozygosity
(d) segregate characters
c
What is outbreeding device, where the staments and carpels mature at different times called?
(a) Monoecy
(b) Self sterility
(c) Dichogamy
(d) Heterostyly
c
Remarkable increase in rice production from 35 million tones to 89.5 million tones during 1960 – 2000 was mainly due to _____
(a) Improved semidwarf varieties
(b) Introduction of Golden rice
(c) Increased use of chemical fertilizers
(d) Cultivation of wild varieties
a
Which of the following is the first cell of female gametophytic generation in Angiosperms?
(a) Megaspore mother cell
(b) Microspore mother cell
(c) Functional megaspore
(d) Egg cell
c
During dihybrid cross, in the F2 generation, the ratio of individuals showing one dominant and the other recessive character will be ______ of parents with constrasting characters.
(a) 4/16
(b) 6/16
(c) 8/16
(d) 9/16
b
In an ecological succession the pioneers are generally _____
(a) Autotrophs
(b) Carnivores
(c) Herbivores
(d) Detrivores
a
High levels of Aspartic acide, low nitrogen and sugar content in maize plants prevent the attack by _____
(a) Aphids
(b) Jassids
(c) Boll worms
(d) Stem borers
d
Which of the following wall layer of anther shows fibrous thickenings of callose?
(a) Epidermis
(b) Tapetum
(c) Middle layer
(d) Endothecium
d
During a dihybrid cross with constrasting characters in the F2 generation parental genotypes will appear in _____ ratio.
(a) 1/16
(b) 2/16
(c) 3/16
(d) 9/16
b
The wall of pollen tube is made up of
(a) Cellulose and Pectin
(b) Only sporopollenin
(c) Lignin and Pectin
(d) Pectin and Sporopollenin
a
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