In India, gene bank of wheat is located at
Which region of the root-tip is involving in the formation of root hairs by epidermal cells?
Consider the following statements regarding photosynthesis.
(1)ATP formation during photosynthesis is termed as photophosphorylation.
(2)Kranz anatomy pertains to leaf.
(3)Reduction of NADP to NADPH occurs during Calvin cycle.
(4)In a chlorophyll molecule magnesium is present in phytoltail.Of the above statements.
Which type of pyramid shows standing crop ecosystem ?
Which of the following is the simplest amino acid?
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Solution
The general structure of an amino acid is
Which of the following groups of plants play an important role in plant succession on bare rocks/soil?
Match Column I with Column II
| Column I | Column II |
|---|---|
| A.Diffusion | 1.Hydrophilic substances |
| B.Osmosis | 2.Shrinkage of protoplasm |
| C.Imbibition | 3.Semipermeable membrane |
| D.Plasmolysis | 4.Free movement of ions and gases |
Middle ear is filled with –
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Solution
Middle ear is filled with air.
The blood leaving the lungs has all its haemoglobin oxygenated and gives up oxygen to the tissues, because
Which of the following is a richly vascular layer with lots of blood capillaries ?
The hormone that suppresses the immune system is
Elbow joint is an example of
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Solution
Elbow joint is an example of hinge joint. The elbow is a hinge joint; it can open and close like a door. Hinge joint allows angular movement in one plane only, increasing or decreasing the angle between the bones e.g. elbow joint, knee joint etc.
Figure shows blood circulation in humans with labels A to D.Select the option which gives correct identification of label and functions of the part:
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Solution
Artery is blood vessel which receives blood from heart,has elastic thick wall shows jerky movements due to pumping activity of heart. Vein is a blood vessel which carries blood towards the heart, has wider lumen with internal valves where blood flows smoothly and slowly.Blood capillary is a very fine blood vessel which has a single layered wall. Pulmonary veins are the only veins which carry oxygenated blood. (pO2= 95 mm Hg, pCO2= 40 mm Hg)
The species that invade a bare area are called
A young infant may be feeding entirely on mothers milk which is white in colour but the stools which the infant passes out is quite yellowish. What is this yellow colour due to ?
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Solution
Young infant may be feeding entirely on mother’s milk which is white in colour but the stools which the infant passes out is quite yellowish because bile pigments passed through bile juice. Bile pigments are any of several coloured compounds derived from porphyrin that are found in bile; principally bilirubin and biliverdin. Bile pigment is produced regularly when old red blood cells are broken down, mainly by the spleen. In some blood-disorders where the red cells are destroyed, more bile pigment is produced.
Fleshy buds produced in the axil of leaves, which grow to form new plants when shed and fall onground, are called
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Solution
Bulbils are fleshy buds produced in the axil of leaves. It grows to form new plants which fall on ground for further development.
Which of the following enzyme/digest milk protein in alkaline medium ?
Bacillus thuringiensis forms protein crystals which contain insecticidal protein.
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Solution
Bacillus thuringiensis produces a large amount of crystalline protein during sporulation. In the cell toxins are formed along with the spore and are referred to as parasporal body. The bacteria are capable of entering the insect’s blood and using the host insect to reproduce. The proteins from ingested spores are activated by gut,high pH and the polypeptide toxins destroy gut epithelial cells and kill the pest.
Gametangial copulation(conjugation) is common in
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Solution
In gametangial copulation two gametangia come in contact and fuse completely to form a zygote or zygospore. It is found in members of zygomycetes, e.g., Rhizopus and Mucor.
Which type of organisation is found in only living beings?