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
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
B.
formation of seeds without syngamy and meiosis
Apomixis in flowering plants is defined as the asexual formation of a seed from the maternal tissues of the ovule, avoiding the processes of meiosis and fertilization leading to embryo development.
In some plants, normal sexual reproduction has no meiosis and syngamy. It is of two types- vegetative reproduction and agamospermy. In vegetative reproduction plants develop from parts other than seeds. In agamospermy, plants produce seeds as means of propagation by abnormal method.