The importance of meiosis lies in :
bringing discontinuous variations
addition in the number of chromosomes
reduction in the number of chromosomes
maintaining the number of chromosomes
D.
maintaining the number of chromosomes
Meiosis is a type of cell division that results in 4 daughter cells each with half the number of chromosomes of the parent cell. It maintains the fixed number of chromosomes in sexually reproducing organisms. It produces haploid gametes by reducing the chromosome number to half. These gametes on fertilization restore diploidy.
The usage of binomial names, for plant species, was accepted by all after the publication of the works by :
Hooker
Linnaeus
Bentham
Darwin
In mitotic cell division, the division of centromere and the division of chromatid occurs between
anaphase and telophase
prophase and metaphase
telophase and interphase
anaphase and metaphase
How many sub-phyla are available in Tracheata, according to Tippo's classification of kingdom Plantae ?
4
6
8
10
The virus, that infects bacteria, are made up of:
Protein only
RNA and protein
DNA and lipid
DNA and protein
The function of microvilli is :
cellular movement
specialized uptake of macro molecules
increase in surface area for absorption
extensive movement of substances over cell surface
Which of the following statement about viruses is correct ?
Viruses are obligate parasites
Viruses contain both RNA and DNA
Nucleic acid of viruses is known as capsid
Viruses possess their own metabolic system
In prokaryotes, the genetic material is :
linear DNA with histones
circular DNA with histones
linear DNA without histones
circular DNA without histones
Chemiosmotic theory of ATP synthesis, in the chloroplast and mitochondria, is based on :
proton gradient
membrane potential
accumulation of K ions
accumulation of Na ions
