Botany Single correct answer type: 1. Which of the following is non-symbiotic nitrogen fixer organism? (A) VAM (B) Azotobacter (C) Anabaena (D) Rhizobium Solution: (B) <i>Anabaena, Nostoc</i> and <i>Aulosira</i> are symbiotic Rhizobium -fixing microbes, while. 2. Aleurone grains are rich in (A) Fat (B) Protein (C) Carbohydrates (D) Auxins Solution: (B) Aleurone grains are rich in protein. This is the peripheral part of endosperm and is very important physiologically because it secrete or accumulates the hydrolyzing enzymes which accumulates the hydrolyzing enzymes which help in digestion of reserve food material during seed germination. 3. Match the following columns and choose the correct option. Column – I Column – II A. Mutation breeding 1. Laborious and expensive process to obtain gene variation B. Selection 2. Hybrid vigour can be maintained for several generations C. Hybridisation 3. Simplest and easiest method of plant improvement D. Introduction 4. Oldest breeding method 5. Quick method to obtain gene
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Botany...Botany Single correct answer type: 1. Which of the following is non-symbiotic nitrogen fixer organism? (A) VAM (B) Azotobacter (C) Anabaena (D) Rhizobium Solution: (B) Anabaena,
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Botany
Single correct answer type:
1. Which of the following is non-symbiotic nitrogen fixer organism?
(A) VAM (B) Azotobacter
(C) Anabaena (D) Rhizobium
Solution: (B)
<i>Anabaena, Nostoc</i> and <i>Aulosira</i> are symbiotic Rhizobium -fixing
microbes, while.
2. Aleurone grains are rich in
(A) Fat (B) Protein (C) Carbohydrates (D) Auxins
Solution: (B)
Aleurone grains are rich in protein. This is the peripheral part of endosperm and is very
important physiologically because it secrete or accumulates the hydrolyzing enzymes
which accumulates the hydrolyzing enzymes which help in digestion of reserve food
material during seed germination.
3. Match the following columns and choose the correct option.
Column – I Column – II
A. Mutation breeding 1. Laborious and expensive process to obtain gene variation
B. Selection 2. Hybrid vigour can be maintained for several generations
C. Hybridisation 3. Simplest and easiest method of plant improvement
D. Introduction 4. Oldest breeding method
5. Quick method to obtain gene
variation
(A)
(B)
(C)
(D)
Solution: (B)
A – 5
B – 4
C – 1
D – 3
4. The rupture and fractionation do not usually occur in water column in vessel/trachieds
during the ascent of sap because of
(A) Lignified thick walls
(B) Cohesion and adhesion
(C) Weak grauitational pull
(D) Transpiration pull
Solution: (B)
The vertical conduction of water from root to arial part of plant is called <b>ascent of
sap</b>. The water molecules remain joined to each other due to a force of attraction
called <b> cohesion</b> force. Attraction between water molecules and the walls of
xylem is due to adhesion forces. These forces help to ensure the continuity of water
column in xylem.
5. Stability of ecosystem depends upon
(A) Primary productivity
(B) Interchange between producers and consumers
(C) Number of producers
(D) Number of consumers
Solution: (B)
Network of food chains inter connected at various levels (food web) is meant for
increasing the stability of an ecosystem by providing alternative source of food.
6. The material, which arrests cell division, is obtained from
(A) <i>Crocus</i> (B) <i>Colchicum</i>
(C) <i>Dalbergis</i> (D) <i>Chysanthomum</i>
Solution: (B)
Colchicine is an antibiotic drug (alkaloid), which is obtained from <i>Colchicum</i>
(family – Liliacae). It binds to one tubulin molecule and prevents its polymerization. The
depolymerisation of tubulin result in disappearance of mitotic spindle blocking the cell’s
mitotic chromosomal division at metaphase and anaphase.
7. <i>Viscum album</i> grown on trees. This is an example of
(A) Symbiosis (B) Parasitism
(C) Commensalism (D) Predation
Solution: (B)
<i>Visum album</i> is a partial stem parasite that grows on poplar, apple, walnut, oats,
etc. The parasite send primary haustorium into the host for deriving food from them.
8. Which of the following is responsible for biological nitrogen –fixation?
(A) Nife gene
(B) Nitrogenase
(C) Yeast alanine tRNA synthetase
(D) RNA sunthetase
Solution: (A)
<i>Azo</i> tobacterk and clostrodium are free livingnitrogen fixing are microorganisms.
VAM is symbiotic relationship between fungi and higher plants. <i>Nif</i> gene is
responsible for biological nitrogen-fixation, which directs the synthesis of nitrogenase
enzyme.
9. The respiratory quotient during cellular respiration would depend on the
(A) Nature of enzymes involved
(B) Nature of the substrate
(C) Amount of carbon dioxide released
(D) Amount of oxygen utilized
Solution: (B)
R Q is the ratio of the volume of eleased to the volume of oxygen taken in
respiration. It depends on the nature of the substrate, which is oxidized, for
carbohydrates R Q is one, for fats and protein less then one, and is more than one for
organic acids.
10. Which of the following supports a dense population of plankton and littoral
vegetation?
(A) Oilgotrophic (B) Eutrophic
(C) Lithotrophic (D) Agroecotrophic
Solution: (B)
Eutrophication means nutrient enrichment. The main factor that caused eutrophication
is the release of large amount of phosphate into water body.
11. Which of the following is not true for a species?
(A) Members of a species can interbreed
(B) Variations occur among members of species
(C) Each species is reproductively isolated from every other species
(D) Gene flow does not occur between the populations of a species
Solution: (D)
Gene flow means the spread of genes through population as affected by movements of
individuals and other propagules, e.g., spores seeds, etc.
12. Given below is the chemical formula of
(A) Palmitic acid (B) Glycerol
(C) Galactose (D) Stearic acid
Solution: (A)
( ) is the chemical formula of palmitic acid. It is a saturated fatty acid.
13. Choose the wrong pair
(A) <i>Cenchrus</i> - Savanna
(B) <i>Abies</i> - Coniferous forest
(C) <i>Quercus</i> - Broad leaf forest
(D) <i>Tectona</i> - Temperate forest
Solution: (D)
<i>Tectona grandis</i> (Teak) is found in tropical moist deciduous forest.
14. Rarely among angiosperms, the pollen grains influenced the endosperm. This is
called as
(A) Meta xenia (B) Nemec phenomenon
(C) Xenia (D) Mesogamy
Solution: (C)
The direct or indirect effect of pollen is seed or fruit has been termed by <b>Foke</b>
(1881) as xenia. This phenomenon is seen is <i>Zea mays</i> alone and in limited to
the endosperm part only.
15. Three floral diagrams are given here. Their respective families are assigned in the
answer key. Find out the families to which these diagrams belong to
(A) A – Liliaceae, B – Asteraceae, C - Solanaceae
(B) A – Asteraceae, B – Solanaceae, C – Brassicaceae
(C) A – Asteraceae, B – Solanaceae, C – Asteraceae
(D) A – Poaceae, B – Solanaceae, C – Asteraceae
Solution: (B)
‘Pappus’, a hairy structure is a modification of calyx and is the characteristic feature of