The flavour of apples is mainly due to which one of the following?
Answer: C
The flavour of apples is chiefly due to ethanal (acetaldehyde).
It is one of the volatile compounds released as the fruit ripens, along with esters such as ethyl butanoate. Formalin and benzaldehyde are quite different: benzaldehyde gives almonds their smell.
Please log in or register to report this question.
Palaeobotany is the branch of botany in which we study
Answer: B
Palaeobotany is the study of plant fossils.
It reconstructs past vegetation and climates from fossil wood, leaves, pollen and spores, and provides much of the evidence for continental drift - the same fossil flora appearing on continents now far apart.
Please log in or register to report this question.
Which among the following statements concerning platelets is INCORRECT. Platelets:
Answer: A
The incorrect statement is that platelets contain DNA.
They have no nucleus, being fragments budded off from megakaryocytes in the marrow. The rest is true: they are roughly disc-shaped, about 2 to 3 micrometres across against the red cell's 7, and synthesise very little protein.
Please log in or register to report this question.
Bone deformities occur due to the excess intake of
Answer: D
Excess fluorine causes bone deformity.
Skeletal fluorosis follows years of drinking water with more than about 1.5 mg of fluoride per litre: the bones thicken, the ligaments calcify and the spine and limbs bend. It is endemic in parts of Rajasthan, Andhra Pradesh and Gujarat.
Please log in or register to report this question.
What is pH value of human blood ?
Answer: A
Human blood has a pH of about 7.4 - slightly alkaline.
It is held within 7.35 to 7.45 by the bicarbonate buffer system, by the lungs regulating carbon dioxide and by the kidneys excreting acid. Outside about 6.8 to 7.8 life cannot continue.
Please log in or register to report this question.
What is the correct order for Respiration?
Answer: B
Respiration proceeds glycolysis → Krebs cycle → electron transport chain.
Glycolysis splits glucose into pyruvate in the cytoplasm; the Krebs cycle oxidises it fully in the mitochondrial matrix, releasing carbon dioxide and reduced coenzymes; and the electron transport chain uses those to make most of the ATP.
Please log in or register to report this question.
The inflorescence of wheat is-
Answer: C
The inflorescence of wheat is a spike.
Its flowers are borne in spikelets attached directly to the main axis without stalks, which is what defines a spike. A raceme has stalked flowers, a panicle is a branched raceme, and a catkin is a pendulous spike of unisexual flowers.
Please log in or register to report this question.
The richest source of vitamin D is
Answer: C
Cod liver oil is the richest source of vitamin D.
Vitamin D is fat-soluble and concentrated in the liver oil of fish. The other main source is the skin's own synthesis under sunlight, which supplies most of what people get.
Please log in or register to report this question.
IR-20 is a high yielding variety of-
Answer: B
IR-20 is a high-yielding variety of rice.
It came from the International Rice Research Institute in the Philippines, whose IR-8 in 1966 began the rice half of the Green Revolution. The dwarf stem resists lodging under heavy fertiliser.
Please log in or register to report this question.
Most of the red, blue and purple colours of plants are due to a pigment called
Answer: A
Red, blue and purple plant colours are usually due to anthocyanins, water-soluble pigments dissolved in the cell sap.
Their colour depends on the pH: red in acid, purple near neutral, blue in alkali. They give roses, beetroot and red cabbage their colour, and autumn leaves much of theirs.
Please log in or register to report this question.
