Precursor of ethylene hormone?
old Continuation…
NEET Botany Model Paper-1
26) In which phase DNA content will be doubled ?
(a) Interphase (b) Anaphase
(c) Prophase (d) Telophase
Ans (a)
S-phase portion of interphase is when the DNA content of a cell increases…. During the S phase, the cell replicates its genetic material so that each chromo- some will contain two molecules of DNA. Thus, upon completion of the S phase, the cell has the same number of chromosomes, but its DNA content has doubled.
27) Which phase comes in between the G1 and Go phases of cell cycle?
(a) M-phase (b) Go-phase
(c) S-phase (d) Interphase
Ans (c )
Interphase is composed of G1 phase (cell growth), followed by S phase (DNA synthesis), followed by G2 phase (cell growth). At the end of interphase comes the mitotic phase,
28) Cell division can not be stopped in which phase of the cell cycle?
(a) G -phase (b) Go-phase
(c) S-phase (d) Prophase
Ans (c )
Cell cycle cannot be stopped at S phase as it is the part of cell cycle in which DNA is replicated , occuring between G1 phase and G2 Phase. Precise and accurate replication is necessary to preve- nt genetic abnormalities which often lead to cell death or disease. As a result, cell division cannot be stopped in S phase.
29) Colchicine arrests spindle at
(a) anaphase (b) prophase(c) telophase (d) metaphase
Ans (d)
alkaloid drug, colchicine, extracted from the corm of the autumn crocus (Colchicum autumnale), arrests mitosis in metaphase by interfering with the formation of spindle fibrils.
30) Cytochrome oxidase enzyme contains?
a) Mg b) Fe c) Hg d) Co
Ans (d)
The final stage of respiratory chain involves cytochrome oxidase, which contain copper. This stage can be specifically inhibited by cyanide or carbon monoxide cyanide combines with copper and prevents O2 from combining with it.
31)Which saprophyte prokaryote becomes an endosymbiotic diazotrops ?
)a) Rhizobium b) Clostridium
c) Nostoc d) Azotobacter
Ans (a )
nitrogen-fixing bacteria (called rhizobia), which live in the root nodules of legumes; single-cell algae inside reef-building corals, and bacterial endosymbionts that provide essential nutrients to about 10–15% of insects.
32) Which of the following is formed during photorespiration ?
a) Sugar
b) phosphoglycolate
c) NADPH d) ATP
Ans (a)
33) Which of the following is true for Photosynthesis ?
a) Reduction of CO2 and water b) Oxidation of CO2 and water
c) Reduction of CO2 and oxid ation water
d) Oxidation of CO2and Redu- ction of water
Ans (b)
Photosynthesis is the process in which autotrophs such as green plants use carbon dioxide and water in presence of sunlight to synthesize nutrients such carbo- hydrates in the form of glucose and release oxygen. In this carbon dioxide is reduced to glucose and water is oxidized to release oxygen.
34) The site of occurrence of Glycolysis is
a) Mitochondrial matrix
b) Oxysomes
c) Cytoplasm d) Peroxysomes
Ans (c )
Glycolysis is an oxygen-independent metabolic pathway. … In most organisms, glycolysis occurs in the cytosol. The most common type of glycolysis is the Emb- den–Meyerhof–Parnas (EMP pathway), which was discovered by Gustav Embden, Otto Meye- rhof, and Jakub Karol Parnas.
35) One turn of Krebs Cycle yields
a) 3NADH2, 1FADH2, 1GTP b) 3NADH2, 2FADH2, 1GTP
c) 4NADH2, 2FADH2, 1GTP d) 3NADH2, 2FADH2, 1GTP
ANS (a)
The eight steps of the citric acid cycle are a series of redox, dehydration, hydration, and decarboxylation reactions. Each turn of the cycle forms one GTP or ATP as well as three NADH molecules and one FADH2 molecule
36) Corbohydrate RQ value—–
a) 1 b) less than 1
c) 0 d) greater than 1
Ans (a)
Exp: RQ-Values
Name of the substance Respiratory Quotient
Carbohydrates 1
Proteins 0.8 – 0.9
Ketones 0.73
(eucaloric)
Ketones 0.66
(hypocaloric)
Triolein (Fat) 0.7
Oleic acid (Fat) 0.71
Tripalmitin (Fat) 0.7
Malic acid 1.33
Tartaric acid 1.6
Oxalic acid 4.0
37) Precursor of ethylene hormone ?
a) Methionine b) Tryptophan
c) Cystein d) None
Ans (a)
The amino acid methionine is the precursor of ethylene.
38) Vernalization coined by
a) Darwin
b) Garner and Allard
c) Geoffery d) Lysenko-1928
Ans (d)
Lysenko himself translated the term into “vernalization” (from the Latin vernum meaning Spring). After Lysenko the term was used to explain the ability of flowe-ring in some plants after a period of chilling due to physiological changes and external factors.
39) IARI Means ——-
a) Indian Agriculture Research Institute
b) International Agrochemical Research Institute
c) Indian Agrochemical
Research Institute
d) Indian Agriculture Resource Institute
Ans (a)
Formerly called. Imperial Institute of Agricultural Research. The Indian Agricultural Research Institute (IARI), commonly known as the Pusa Institute, is India’s national Institute for agricultural research, education and extension
40) Which Organism is Usefull to form Biofertilizer?
a) Glomus b) Cyanobacteria
c) Azospirillum
d) All of the above
Ans (d)
N-fixing biofertilizers: These include the bacteria Rhizobium, Azotoba cter, Azospirillum, Clostridium and Acetobacter among others; blue-green algae (BGA), or cyanobacteria, and the fern Azolla (which works in symbio sis with BGA) Glomus etc .
41) Norman Borlaug the ‘Father of Green Revolution’ has developed a highly recognized and appreciated cultivating variety of ?
a) Wheat b) Rice
c) Onion d) Sugarcane
Ans (a)
42) Glomus helps in absorption of phosp horus from the soil by plants ?
a) Anabena b) Frankia
c) Glomus d) Rhizobium
Ans (c)
43) Golden rice is a genetically modified, crop plant where incorporated gene is meant for Biosynthesis of ?
a) Vitamin-B b) Vitamin-C
c) Vitamin-A d) Omega-3
Ans (c)
Golden rice is a genetically modi fied, biofortified crop. Biofortifi- cation increases the nutritional value in crops. Golden rice is genetically modified in order to produce betacarotene, which is not normally produced in rice. Beta carotene is convereted into Vitamin A when metabolized by the human body
44) Offsets are produced by
(1) Meiotic divisions
(2) Mitotic divisions
(3) Parthenocarpy
(4) Parthenogenesis
Ans (2)
offset is part of branch or stem by which a plant can reproduce asexually and a new daughter plant is formed. Offset are the means of vegetative reproductio -n in plants. These are the clones and genetically identical to the plants. These are produced by the mitotic division of the main stem of the plant
45) Select the incorrect match :
(1) Lampbrush – Diplotene bivalents chromosomes
(2) Allosomes – Sex chromosomes
(3) Submetacentric – L-shaped chromososmes chromosomes
(4) Polytene – Oocytes of amphibians chromosomes
Ans. (4)
NEET BOTANY MODEL PAPER-2
1) Find Out The Mismatch
a) Ovary–Fruitry
b) Part of flower—-Post fertili- zed form
c) Zygote — Endosprm
d) Integument–Seed coat
Ans: c
2) Which Plant is generally called terror of Bengal ?
a) Water Lettuce
b) Water Hyacinth
c) Hydrilla d) Vallisnaria
Ans: b
The plant water hyacinth (Eichhornia crassipes) is nicknamed as the “Terror of Bengal” because it grows at an alarming rate and spreads on the surface of the water body. This cut out of the light and it also causes an increase in the oxygen demand. Thus, causing the death of fishes and other aquatic organisms.
3) Pencilliumasexually reproduce through ?
a) Zoospores b) Conidia
c) Chlamidospores d) Akinetes
Ans: b
Penicillium is a saprophytic fungus, commonly known as blue or green mold. Asexual reproduction in Penicillium takes place by unicellular, uninucleate, non-motile spores, the conidia; formed on conidiophore. A number of flask-shaped phialides or sterig mata develops at the tip of each metulae.
4) Mismatch one identify
List-1 List-2
a) Orthotropous______ Polygonaceae&Piperaceae
b) Circinotropous __ 3600 Curvature
c) Amphitropous __ Horse Shoe shaped
d) Campylotropus __ Cactaceae
Ans:d
Sabbidi Ramesh
Lecturer in Botany & Neet faculty,
Govt Junior College,
Banswada-
8179227595.
