Study of inter relationship between living organism and their environment is called _______
Answer: C
The study of the relationship between organisms and their environment is ecology.
Haeckel coined the word in 1866 from the Greek oikos, household. An ecosystem is one unit of study within ecology, not the study itself.
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Movements due to light are shown by
Answer: A
Movements in response to light are shown by flowering plants.
Phototropism bends the shoot towards light; the sunflower head tracking the sun and the leaves of the prayer plant folding at dusk are other examples. Such movements need the differential growth or turgor changes that the higher plants possess.
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Outer covering of virus made up of protein is
Answer: A
The protein coat of a virus is the capsid.
It is built of repeating subunits called capsomeres, and it protects the nucleic acid and attaches the virus to a host cell. A complete virus particle is a virion; a viroid is a naked infectious RNA with no protein at all.
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Important objective of biotechnology in agriculture section is _________
Answer: A
The important agricultural objective of biotechnology is to produce disease-resistant varieties of plant.
Genes for resistance to insects, viruses and herbicides can be transferred directly, without the many generations of back-crossing conventional breeding needs. Bt cotton and virus-resistant papaya are examples.
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Important component that helps in clotting of the blood is called ____.
Answer: B
Platelets are the component that starts blood clotting.
They clump at the site of injury and release thromboplastin, which converts prothrombin to thrombin; thrombin then turns soluble fibrinogen into the insoluble fibrin mesh that traps blood cells and seals the wound.
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The biogenetic law was proposed by
Answer: C
The biogenetic law was proposed by Ernst Haeckel in 1866.
It states that ontogeny recapitulates phylogeny - that an embryo passes through stages resembling its ancestors. The law is not accepted as stated, but embryos of related groups do resemble one another closely, which is real evidence of common descent.
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In which of the following kind of organisms is the phenomenon found where in the female kills the male after copulation __________
Answer: C
The spider is the animal in which the female may kill the male after mating.
It is best known in the black widow and in some orb-weavers. The male is much the smaller, and the meal helps the female provision her eggs; males of several species have evolved elaborate strategies to escape.
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In which Organelle does Cellular Respiration Occur?
Answer: D
Cellular respiration takes place in the mitochondrion.
Glycolysis occurs in the cytoplasm, but the Krebs cycle in the mitochondrial matrix and the electron transport chain on its inner membrane produce almost all the ATP - which is why it is called the powerhouse of the cell.
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The technique of DNA fingerprinting in human was developed for first time by _________
Answer: B
Alec Jeffreys developed DNA fingerprinting, at Leicester in 1984.
He found that certain repeated sequences vary in number between individuals, giving each person a unique pattern. It was first used in 1986 to clear an innocent suspect and convict the real murderer.
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Gametophytes of sexually reproducing flowering plants are-
Answer: A
The gametophyte of a flowering plant is haploid.
It arises from a spore produced by meiosis, so it carries a single set of chromosomes. In angiosperms it is reduced to the pollen grain and the embryo sac. The sporophyte, the visible plant, is diploid.
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