Casparian strips are present in :

• cortex

• epidermis

• endodermis

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

How many sub-phyla are available in Tracheata, according to Tippo's classification of kingdom Plantae ?

• 4

• 6

• 8

• 10

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

In prokaryotes, the genetic material is :

• linear DNA with histones

• circular DNA with histones

• linear DNA without histones

• circular DNA without histones

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

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

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

The virus, that infects bacteria, are made up of:

• Protein only

• RNA and protein

• DNA and lipid

• DNA and protein

The usage of binomial names, for plant species, was accepted by all after the publication of the works by :

• Hooker

• Linnaeus

• Bentham

• Darwin