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Question : A leaf without petiole is known as :

Question : A leaf of 20cm^(2) growth 5cm^(2) per hour and B leaf of 25cm^(2) grows 5cm^(2) per hour The relativegrowth rate of leaf A and B respectively is

Question : A leaf peeling of Tradescantia is kept in a medium having 10% NaCl. After a few minutes if we observe the leaf peel under the microscope, we are likely to see

Question : A leaf is modified to phyllode in :

Question : [A]: Leaf in Daucus carota is decompound. [R]: Saprophytic and parasitic modes of nutri- . tion are considered as advanced feature

Question : A leads to mixing of genetic material of male and female which is known as B, which result is formation of C. Fill in the above blanks with suitable option

Question : A lataral deviation of the alignment of the vertebral column is called

Question : A large proportion of oxygen remains unused in the human blood even after its uptake by the body tissues. This O_2

Question : A large number of unknown species of plantsand animals are believed to be present in :-

Question : A large bract which completely encloses whole inflorescence is called as :

Question : [A]: Lampbrush chromosomes arf3 found in the oocytes of certain animals during the prophase of meiosis. Such chromosomes consist of two central strands along which fine loops extend laterally. [R]: The loops are thought to be active re- gions of RNA synthesis

Question : A lakewith aninflowof domesticsewagerich inorganicwastemay result in

Question : A lake which is rich in organic waste may result in(A) increased population of aquatic organisms due to minerals(B) drying of the lake due to algal bloom(C) increased population of fish due to lots of nutrients(D) mortality of fish due to lack of oxygen

Question : A lake with an inflow of domestic sewage rich in organic waste, may result in:

Question : A Lake ecosystem is

Question : A lake community suddenly suffers from algal blooms. Using the strategy of biomanipulation, an ecologist may propose

Question : A lake ceceiving nutrients is :

Question : A lady, whose father was colourblind and mother was normal, got married with a man suffering from Hypertrichosis and haemophilia. What percentage of their offsprings will have alleles of two trait genotypically -

Question : (a) Label the three tiers 1, 2, 3 given in the above age pyramid. (b) What type of population growth is represented by the above age pyramid ?

Question : [A]: Kornberg and Ochoa got Nobel Prize in the field of genetics. [R]: Because they proposed mutation Theory

Question : A kind of Biotechnology involving manipulation of DNA is

Question : [A]:Jaws suspensorium in Mammals is craniostylic. [R]: Articulation of lower jaw is at the man- dibular tossa of the squamous region of the temporal bone rather than at the quadrate.

Question : [A]: Isolation is a mechanism which prevents interbreeding among other wise potential mates.[R]: It is the key factor without which all other factors of evolution will merge into jumble of no significance

Question : [A]: It is not possible to take photograph and count chromosomes when they are highly coiled and condensed. [R]: Each species has a variable number of chromosomes.

Question : [A]: Isolation prevents inbreeding among the otherwise potential mates.[R]: It preserves variations which can lead to speciation.

Question : Which of the following happens in first phase of waste water treatment ?

Question : (a) is the smallest prokaryote and can survive with out (b)

Question : a' is associated with whom in figure ?

Question :(a)is the extrachromosomal DNA present in(b)of prokaryotic cell.

Question : (a) India has greater ecosystem diversity than norway .Do you agree with the statement? Given reasons in support of your answer (b) Write the difference between genetic biodiversigy and species biodiversity that exists at all the levels of biologicval orgainisation

Question : [A]: Incompatibility is a gene physiological process. [R]: Moderately high temperatures are also known to reduce self incompatibility reaction in certain plants.

Question : [A] :In vertebrates, motor fibres to striped muscle. parasympathetic fibres to smooth muscle. and preganglionic sympathetic ii- bres are cholinergic. [R]: Cholinergic designates the type of nerve fibre that releases acetylcho|ine from its end- ing when stimulated by a nerve impulse.

Question : [A]: In vertebrates, motor fibres to striped muscle, parasympathetic fibres to smooth muscle, and preganglionic sympathetic fi- bres are cholinergic. [R]: Cholinergic designates the type of nerve fibre that releases acetylcholine from its end- ing when stimulated by a nerve impulse

Question : A. In the figure, which is the coccus form of bacteria

Question : [A]: In some organisms the end stages of the ancestral development pattern are dropped, as ·in case of neoteny.[R]: In some animals, some middle stages are dropped in the descendents

Question : .A. in the above trancription unit is

Question : [A] :In old age, the skin gets wrinkled. [R]: Epidermis has a single layer of cells.

Question : [A]: In paracentric inversions the centromere is outside the inverted segment. [R]: In pericentric inversion, the inverted seg- ment includes the centromere

Question : [A]: In low degree smoking is helpful [R]: In low doses, nicotine stimulates con- duction of nerves impulses & relaxes the muscles

Question :(a) In human genome which one of the chromosomes has the most genes and which one has the fewest? (b) Scientists have identified about 1.4 million single nucleotide polymorphs in human genome. How is the information of their existence going to help the scientists?

Question : [A]: In large groups of animals and plants, there are identical enzymes and hormones available.[R]: This suggests organic evolution

Question : (a) in humans, males are heterogametic and females are homogametic. Explain. Are there any examples where males are homogametic and females heterogametic ?

Question : A -In human male, testes are extraabdominal and lie in scrotal sacs. R -Scrotum acts as thermoregulator and keeps temperature lower by 2^@C for normal sperm production.