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3 questions

Which of the following would help in prevention of diuresis ? Answer: 2. Reabsorption of Na ^+ and water from renal tubules due to aldosterone Diuresis is increased urine output. It is prevented when mo... Regulation of kidney function, disorders, dialysis 1 answer
In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct ? Answer: 2. Gross primary productivity is always more than net primary productivity. Net primary productivity = Gross primary productivity mi... Productivity and decomposition 1 answer
Match the following columns and select the correct option.Column - I | Column - II(a) Placenta | (i) Androgens(b) Zona pellucida | (ii) Human Chorionic Gonadotropin (hCG)(c) Bulbo-urethral glands | (iii) Layer of the ovum(d) Leydig cells | (iv) Lubri… Answer: 4. (a) (ii), (b) (iii), (c) (iv), (d) (i) Placenta secretes hCG: (a) - (ii). Zona pellucida is a layer of the ovum: (b) - (iii). Bul... Male and female reproductive systems 1 answer
Some dividing cells exit the cell cycle and enter vegetative inactive stage. This is called quiescent stage (G_0). This process occurs at the end of : Answer: 2. G ₁ phase Cells leave the cell cycle to enter the G0 (quiescent) stage at the end of G1 phase, before the S phase begins. They re... Cell cycle, mitosis, meiosis 1 answer
Flippers of Penguins and Dolphins are examples of : Answer: 2. Convergent evolution Penguin and dolphin flippers have similar function and shape but evolved in unrelated groups (a bird and a m... Adaptive radiation 1 answer
If the distance between two consecutive base pairs is 0.34 nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is 6.6×10^9 bp, then the length of the DNA is approximately : Answer: 3. 2.2 meters Length = number of bp x distance per bp. L = 6.6×10⁹×0.34×10⁻⁹\ m = 2.244\ m≈ 2.2\ m So the answer is about 2.2 metres... DNA as genetic material, DNA and RNA structure, DNA packaging 1 answer
Ray florets have : Answer: 1. Inferior ovary Key idea: In sunflower (family Asteraceae), ray florets are female or sterile and have an inferior ovary. Asterace... Families: Malvaceae, Cruciferae, Leguminosae, Compositae, Gramineae 1 answer
According to Robert May, the global species diversity is about : Answer: 4. 7 million Key idea: Robert May estimated global species diversity at about 7 million. The IUCN figure of described species is abo... Biodiversity: concept, patterns, importance, loss 1 answer
Identify the wrong statement with reference to transport of oxygen. Answer: 3. Higher H^+ conc. in alveoli favours the formation of oxyhaemoglobin. Key idea: Oxygen binding to haemoglobin is favoured by high... Breathing and respiration: mechanism, exchange and transport of gases, volumes, disorders 1 answer
The specific palindromic sequence which is recognized by EcoRI is : Answer: 1. 5' - GAATTC - 3'3' - CTTAAG - 5' Key idea: EcoRI recognises 5'-GAATTC-3' and cuts between G and A. A palindrome reads the same on... Tools: restriction enzymes, vectors, host 1 answer
Identify the wrong statement with regard to Restriction Enzymes. Answer: 4. Sticky ends can be joined by using DNA ligases. Key idea: Judge each statement against the NCERT chapter on restriction enzymes.... Tools: restriction enzymes, vectors, host 1 answer
Which of the following is put into Anaerobic sludge digester for further sewage treatment ? Answer: 4. Activated sludge Key idea: In secondary treatment, a part of the activated sludge is passed to anaerobic sludge digesters. Bacter... Sewage treatment and energy generation (biogas) 1 answer
Select the correct events that occur during inspiration.(a) Contraction of diaphragm(b) Contraction of external inter-costal muscles(c) Pulmonary volume decreases(d) Intra pulmonary pressure increases Answer: 1. (a) and (b) Key idea: Inspiration is an active process that increases thoracic volume. The diaphragm and external intercostal mus... Breathing and respiration: mechanism, exchange and transport of gases, volumes, disorders 1 answer
If the head of cockroach is removed, it may live for few days because : Answer: 3. the head holds a small proportion of a nervous system while the rest is situated along the ventral part of its body. Key idea: A... Animal tissues: epithelial, connective, muscular, neural 1 answer
Which of the following statements are true for the phylum-Chordata ?(a) In Urochordata notochord extends from head to tail and it is present throughout their life.(b) In Vertebrata notochord is present during the embryonic period only.(c) Central ner… Answer: 4. (b) and (c) Key idea: Check each statement. (a) False: in Urochordata the notochord is present only in the larval tail. (b) True... Chordates up to classes 1 answer
Match the organism with its use in biotechnology.(a) Bacillus thuringiensis (i) Cloning vector(b) Thermus aquaticus (ii) Construction of first rDNA molecule(c) Agrobacterium tumefaciens (iii) DNA polymerase(d) Salmonella typhimurium (iv) Cry proteins… Answer: 2. (a) (iv), (b) (iii), (c) (i), (d) (ii) Key idea: Match each organism with its biotechnology use. Bacillus thuringiensis: Cry prot... Tools: restriction enzymes, vectors, host 1 answer
Match the following concerning essential elements and their functions in plants :(a) Iron (i) Photolysis of water(b) Zinc (ii) Pollen germination(c) Boron (iii) Required for chlorophyll biosynthesis(d) Manganese (iv) IAA biosynthesisSelect the correc… Answer: 3. (a) (iii), (b) (iv), (c) (ii), (d) (i) Key idea: Recall the role of each element. Iron: needed for chlorophyll biosynthesis (iii)... Photosynthesis: site and pigments 1 answer
Identify the incorrect statement. Answer: 3. Sapwood is the innermost secondary xylem and is lighter in colour. Key idea: Heartwood is the innermost secondary xylem and is da... Plant tissues and anatomy of root, stem, leaf 1 answer
Match the following :(a) Inhibitor of catalytic activity (i) Ricin(b) Possess peptide bonds (ii) Malonate(c) Cell wall material in fungi (iii) Chitin(d) Secondary metabolite (iv) CollagenChoose the correct option from the following : Answer: 1. (a) (ii), (b) (iv), (c) (iii), (d) (i) Key idea: Match each item with its category. Inhibitor of catalytic activity: malonate (co... Enzymes: types, properties, action, classification 1 answer
Meiotic division of the secondary oocyte is completed : Answer: 4. At the time of fusion of a sperm with an ovum Key idea: The secondary oocyte is arrested in metaphase II and completes meiosis II... Fertilisation, embryo development to blastocyst, implantation 1 answer
The first phase of translation is : Answer: 3. Aminoacylation of tRNA Key idea: Translation begins with charging of tRNA. The first phase is aminoacylation: an amino acid is ac... Transcription, genetic code, translation, protein biosynthesis 1 answer
Which of the following regions of the globe exhibits highest species diversity ? Answer: 4. Amazon forests Key idea: The Amazon rainforest has the highest species diversity on Earth. It holds more than 40,000 plant specie... Biodiversity: concept, patterns, importance, loss 1 answer
Which of the following statements is not correct ? Answer: 3. The functional insulin has A and B chains linked together by hydrogen bonds. Key idea: Mature insulin chains A and B are joined b... Applications in health: human insulin, vaccines, gene therapy 1 answer
The transverse section of a plant shows following anatomical features :(a) Large number of scattered vascular bundles surrounded by bundle sheath.(b) Large conspicuous parenchymatous ground tissue.(c) Vascular bundles conjoint and closed.(d) Phloem p… Answer: 1. Monocotyledonous stem Key idea: Scattered, conjoint, closed vascular bundles with bundle sheaths and no phloem parenchyma indicat... Plant tissues and anatomy of root, stem, leaf 1 answer

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