Nuclear membrane is absent in ?
Answer: A
The prokaryotes have no nuclear membrane.
Their DNA lies free in the cytoplasm as a single circular chromosome in a region called the nucleoid. Bacteria and archaea are prokaryotes; protozoa are eukaryotes and do have a nucleus.
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Select the correct statement about the Heart Valves.
Answer: B
The correct statement is that the atrioventricular valves are supported by the chordae tendineae, which stop them turning inside out when the ventricles contract.
The tricuspid valve lies between the right atrium and right ventricle and the mitral between the left atrium and left ventricle - the reverse of what two of the other options say.
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Organisms that feed on the excreta of other organisms are called
Answer: C
Organisms that feed on the droppings of others are coprophagous, from the Greek kopros, dung.
Dung beetles and many termites and rodents are coprophagous. Rabbits eat their own soft pellets to extract nutrients released by the second passage through the gut.
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Scientist who is known as "Father of Botany"-
Answer: C
Theophrastus is called the father of botany.
A pupil of Aristotle who succeeded him at the Lyceum, he wrote Historia Plantarum and De Causis Plantarum around 300 BC, describing some five hundred plants and classifying them by form and habit.
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White blood corpuscles are used by our body
Answer: B
White blood corpuscles combat infection.
Neutrophils and macrophages engulf bacteria; lymphocytes make antibodies and destroy infected cells. There are only about 4,000 to 11,000 per cubic millimetre against five million red cells, but their number rises sharply during infection.
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Branch of biology in which we study about cultivation of flowering plant
Answer: B
Floriculture is the cultivation of flowering and ornamental plants.
It covers cut flowers, potted plants, bedding plants and nursery stock. Agronomy deals with field crops and phenology with the timing of seasonal events.
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Which of the following is the largest phylum in the animal kingdom in respect of number of species?
Answer: D
Arthropoda is the largest phylum, with over a million described species - about 80 per cent of all known animals.
It includes insects, crustaceans, arachnids and myriapods, united by a jointed exoskeleton of chitin and jointed limbs. Insects alone outnumber every other group of animals combined.
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Variable number of tandem repeats (VNTRs) in the DNA molecule are highly useful in
Answer: D
Variable number tandem repeats are the basis of DNA fingerprinting.
These short sequences are repeated a different number of times in each individual, so the pattern of fragment lengths is unique except in identical twins. Alec Jeffreys developed the technique in 1984.
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In exo-biology we study about ________
Answer: D
Exobiology is the study of life beyond the earth - on other planets, satellites and in space generally.
It covers the search for life elsewhere, the conditions under which it could arise, and the survival of terrestrial organisms in space. It is also called astrobiology.
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Most abundant tissues of our body are
Answer: A
Muscular tissue is the most abundant in the human body, making up about 40 per cent of body mass.
It comes in three kinds: skeletal muscle attached to bones and under voluntary control, smooth muscle in the walls of hollow organs, and cardiac muscle in the heart.
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