#neet
- Which of the following statements regarding mitochondria is incorrect ? Answer: 2. Enzymes of electron transport are embedded in outer membrane. The enzymes of the electron transport chain are in the inner mitoch... 1
- Which of the statements given below is not true about formation of Annual Rings in trees ? Answer: 4. Annual rings are not prominent in trees of temperate region. Key idea: Annual rings are clearest where seasons differ sharply, so... 1
- Which of the following ecological pyramids is generally inverted ? Answer: 4. Pyramid of biomass in a sea Key idea: A pyramid is inverted when producers weigh less than consumers at a given time. In the sea,... 1
- Placentation, in which ovules develop on the inner wall of the ovary or in peripheral part, is : Answer: 3. Parietal Key idea: Placentation is the arrangement of ovules on the placenta inside the ovary. Marginal: along one margin of a si... 1
- Which of the following protocols did aim for reducing emission of chlorofluorocarbons into the atmosphere ? Answer: 1. Montreal Protocol Key idea: The Montreal Protocol (1987) controls substances that deplete the ozone layer, mainly CFCs. Kyoto Pro... 1
- Which of the following contraceptive methods do involve a role of hormone ? Answer: 1. Lactational amenorrhea, Pills, Emergency contraceptives Key idea: Only methods that change hormone levels involve a hormone. Oral... 1
- Tidal Volume and Expiratory Reserve Volume of an athlete is 500 mL and 1000 mL respectively. What will be his Expiratory Capacity if the Residual Volume is 1200 mL ? Answer: 1. 1500 mL Key idea: Expiratory capacity (EC) = tidal volume + expiratory reserve volume. EC = TV + ERV = 500 + 1000 = 1500\ mL . Th... 1
- What is the fate of the male gametes discharged in the synergid ? Answer: 4. One fuses with the egg and other fuses with central cell nuclei. Key idea: Double fertilisation: both male gametes released into... 1
- What is the site of perception of photoperiod necessary for induction of flowering in plants ? Answer: 4. Leaves Key idea: Photoperiod is sensed by the leaves. Leaves perceive the light/dark duration and produce a flowering stimulus (f... 1
- Select the correctly written scientific name of Mango which was first described by Carolus Linnaeus : Answer: 2. textitMangifera indica Linn. Key idea: In a scientific name the genus starts with a capital letter, the species with a small lett... 1
- Following statements describe the characteristics of the enzyme Restriction Endonuclease. Identify the incorrect statement. Answer: 2. The enzyme binds DNA at specific sites and cuts only one of the two strands. Key idea: Restriction endonucleases cut both strands... 1
- From evolutionary point of view, retention of the female gametophyte with developing young embryo on the parent sporophyte for some time, is first observed in : Answer: 3. Pteridophytes Key idea: Retention of the female gametophyte with the young embryo on the sporophyte appears first in pteridophyte... 1
- In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F_1 generation, pink flowers were obtained. When pink flowers were selfed, the F_2 generation showed white, red and pink flowers. Choose the incorrect statement from the… Answer: 4. Law of Segregation does not apply in this experiment. Key idea: Flower colour in snapdragon shows incomplete dominance, but segre... 1
- Conversion of glucose to glucose-6-phosphate, the first irreversible reaction of glycolysis, is catalyzed by : Answer: 2. Hexokinase Key idea: Hexokinase phosphorylates glucose using ATP to give glucose-6-phosphate, the first irreversible step. Phosph... 1
- Drug called 'Heroin' is synthesized by : Answer: 2. acetylation of morphine Key idea: Heroin (diacetylmorphine, smack) is made by acetylation of morphine. Morphine is extracted from... 1
- The correct sequence of phases of cell cycle is : Answer: 4. G ₁ → S → G ₂ → M The cell cycle runs G₁ → S → G₂ → M . G₁ is growth, S is DNA synthesis, G₂ is preparation for division, and M i... 1
- Concanavalin A is : Answer: 3. a lectin Concanavalin A is a lectin, a carbohydrate-binding protein extracted from jack bean. It is not an alkaloid, an essential... 1
- Purines found both in DNA and RNA are : Answer: 2. Adenine and guanine The purines are adenine and guanine, and both are present in DNA and RNA. Thymine and cytosine are pyrimidine... 1
- Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following : Answer: 2. Flaccidity of bulliform cells Grass leaves have large thin-walled bulliform (motor) cells in the upper epidermis. In dry weather... 1
- The shorter and longer arms of a submetacentric chromosome are referred to as : Answer: 2. p-arm and q-arm respectively By convention the shorter arm of a chromosome is the p-arm (petite) and the longer arm is the q-arm.... 1
- Respiratory Quotient (RQ) value of tripalmitin is : Answer: 2. 0.7 RQ=volume of CO₂ released/volume of O₂ used . Tripalmitin (a fat) oxidises as mathrm2C₅₁H₉₈O₆ + 145 O₂ → 102 CO₂ + 98 H₂O . R... 1
- Which of the following is a commercial blood cholesterol lowering agent ? Answer: 2. Statin Statins (from the yeast Monascus purpureus) inhibit the enzyme that makes cholesterol, so they lower blood cholesterol. Cy... 1
- Match the following structures with their respective location in organs :(a) Crypts of Lieberkühn (i) Pancreas(b) Glisson's Capsule (ii) Duodenum(c) Islets of Langerhans (iii) Small intestine(d) Brunner's Glands (iv) LiverSelect the correct option fr… Answer: 3. (a) (iii) (b) (iv) (c) (i) (d) (ii) Match each structure with its organ. Crypts of Lieberkuhn: glands in the small intestine, so... 1
- Which of the following is the most important cause for animals and plants being driven to extinction ? Answer: 1. Habitat loss and fragmentation The "evil quartet" lists the causes of biodiversity loss. The most important is habitat loss and f... 1