Which form of reproduction is correctly matched?
Euglena transverse binary fission
Paramecium longitudinal binary fission
Amoeba multiple fission
Plasmodium binary fission
Which of the following match is correct?
Emphysema : reduction of surface area of alveoli and bronchi
Pneumonia : occupational disease with asbestos
Silicosis : inflammation of alveoli
Asthma : excessive secretion of bronchial mucus
XO-chromosomal abnormality in human beings causes
Turner's syndrome
Down's syndrome
Klinefelter's syndrome
None of these
A.
Turner's syndrome
Turner's syndrome is characterised by the monosomy of XO type. It is characterized by a lack of ovaries and menstrual cycle. Affected women are sterile and lack secondary sexual characteristics, although the external genitalia are present. The syndrome is named after the US endocrinologist H. H. Turner (1892- 1970).
Down's syndrome is a congential form of mental retardation due to a chromosome defect in which there are three copies of chromosome no. 21 instead of the usual two (XXX). The affected individual has a short broad face and slanted eyes (as in the Mongolian races), short fingers, and weak muscles. It can be detected before birth by amniocentesis. It is named after the British physician John Down ( 1828- 96).
Klinefelter's syndrome is characterised by trisomy (XXY). These are male individuals, who are phenotypically fairly normal but have a fairly low sperm count and are therefore sterile.
Wings of pigeon, mosquito and bat show
divergent evolution
atavism
convergent evolution
all of these
Beta diversity is diversity
in a community
between communities
in a mountain gradient
on a plain
Which of the following is correct match?
Disease | Pathogen |
Wilt disease | Synchytrium |
Citrus canker | Xanthomonas |
Red rot of sugarcane | Ustilago |
Powdery mildew | Fusarium |
Apomixis is
formation of seeds by fusion of gametes
formation of seeds without syngamy and meiosis
formation of seeds with syngamy but no meiosis
none of the above