In which one of the following combinations (a-d) of the number of chromosomes is the present day hexaploid wheat correctly represented
| Combination | Monosoic | Haploid | Nullisomic | Trisomic |
| (a) | 21 | 28 | 42 | 43 |
| (b) | 7 | 28 | 40 | 42 |
| (c) | 21 | 7 | 42 | 43 |
| (d) | 41 | 21 | 40 | 43 |
D.
| (d) | 41 | 21 | 40 | 43 |
The present day wheat is hexaploid, known as triticale (2n = 42) with 3 genomes A, B and D
i.e, AABBDD The 3 genomes are obtained from
3 different diploid species.
(i) Triticum aegilopoides -AA (2n = 14)
(ii) Aegilops speltoides - BB (2n = 14)
(iii) Aegilops squarossa - DD (2n = 14)
By crossing of first two diploids sps Triticum dicoccoides (2n = 28) i.e., tetraploid is produced AABB which on crossing with third species gives rise to Triticum aestivum (2n = 42) hexaploid (AABBDD). So its haploid set will have 21 chromosomes, monosomic (2n - I) will have 41 chromosomes, nullisomics (2n - 2) will have 40 chromosomes, and trisomic (2n + I) will have 43 chromosomes.
Which one of the following is an environment related disorder with the correct main cause
Black lung disease (pneumoconiosis) found mainly in workers in stone quarries and crushers.
Blue baby disease (methaemoglobinaemia) due to heavy use of nitrogenous fertilizers in the area.
Non-hodgkin's lymphoma found mainly in workers involved in manufacture of neem based pesticides.
Skin cancer mainly in people exposed to benzene and methane.
Given below is a highly simplified representation of the human sex chromosomes from a karyotype
The gene a and b could be of
colour blindness and body height
attached ear lobe and Rhesus blood group
haemophilia and red-green colour blindness
phenylketonuria and haemophilia
mong rust, smut and mushroom all the three
are pathogens
are saprobes
bear ascocarps
bear basidiocarps.
Hirudin is
a protein produced by Hordeum vulgare, which is rich in lysine
a toxic molecule isolated from Gossypium hirsutum, which reduces human fertility
a protein produced from transgenic Brassica napus, which prevents blood clotting
an antibiotic produced by a genetically engineered bacterium, Escherichia coli.
When children play bare footed in pools of ditty water and flood water, they may suffer from disease like
leptospirosis and bilharzia
malaria, amoebic dysentery and leptospirosis
bilharzia, infective hepatitis and diarrhoea
guinea worm infection, elephantiasis and amoebic dysentery.
In the following table identify the correct matching of the crop, its disease and the corresponding pathogen.
| Crop | Disease | Pathogen |
| Citrus | Canker | Pseudomonas rubrilineans |
| Potato | Late blight | Fusarium udum |
| Brinjal | Root-knot | Meloidogyne incognita |
| Pigeon | pea Seed gall | Phytophthora infestans |
In which one of the following sets of three items each belong to the category mentioned against them
Lysine, glycine, thiamine - amino acids
Myosin, oxytocin and gastrin - hormones
Rennin, helicase and hyaluronidase - enzymes
Optic nerve, oculomotor, vagus - sensory nerves
Pollution from animal excreta and organic waste from kitchen can be most profitably minimized by
storing them in underground storage tanks
using them for producing biogas
vermiculture
using them directly as biofertilizers
Genes present in the cytoplasm of eukaryotic cells are found in
mitochondria and inherited via egg cytoplasm
lysosomes and peroxisomes
Golgi bodies and smooth endoplasmic reticulum
plastids and inherited via male gamete
