#neet
- Match List I with List II.List I: A. Taenia; B. Paramoecium; C. Periplaneta; D. PheretimaList II: I. Nephridia; II. Contractile vacuole; III. Flame cells; IV. Urecose glandChoose the correct answer from the options give below: Answer: 4. A-III, B-II, C-IV, D-I Key idea: Match the animal with its excretory structure. Taenia: flame cells (III). Paramoecium: contracti... 1
- Once the undigested and unabsorbed substances enter the caecum, their backflow is prevented by- Answer: 3. Ileo - caecal valve Key idea: The valve between the ileum and caecum prevents backflow. The ileo-caecal valve guards the opening... 1
- Match List I with List II with respect to human eye.List I: A. Fovea; B. Iris; C. Blind spot; D. ScleraList II: I. Visible coloured portion of eye that regulates diameter of pupil.; II. External layer of eye formed of dense connective tissue.; III. P… Answer: 2. A-III, B-I, C-IV, D-II Key idea: Match each eye part with its function. Fovea: point of greatest visual acuity (III). Iris: visib... 1
- Match List I with List II.List I (Interacting species): A. A Leopard and a Lion in a forest/grassland; B. A Cuckoo laying egg in a Crow's nest; C. Fungi and root of a higher plant in Mycorrtizae; D. A cattle egret and a Cattle in a fieldList II (Name… Answer: 2. A-I, B-II, C-III, D-IV Key idea: Identify the type of interaction in each case. Leopard and lion share prey: competition (I). Cuc... 1
- Which of the following statements are correct regarding female reproductive cycle?A. In non-primate mammals cyclical changes during reproduction are called oestrus cycle.B. First menstrual cycle begins at puberty and is called menopause.C. Lack of me… Answer: 1. A, C and D only Key idea: Check each statement. A is correct: non-primate mammals show the oestrus cycle. B is wrong: the first m... 1
- Given below are two statements:Statement I: Low temperature preserves the enzyme in a temporarily inactive state whereas high temperature destroys enzymatic activity because proteins are denatured by heat.Statement II: When the inhibitor closely rese… Answer: 2. Both Statement I and Statement II are true. Key idea: Both statements are standard facts about enzymes. Statement I is true: low... 1
- Radial symmetry is NOT found in adults of phylum ________. Answer: 3. Hemichordata Key idea: Adult hemichordates (such as Balanoglossus) are bilaterally symmetrical. Adult echinoderms, ctenophores an... 1
- The reaction centre in PS II has an absorption maxima at Answer: 2. 680 nm Key idea: The reaction centre of PS II is P680, with absorption maximum at 680 nm. The reaction centre of PS I is P700 (70... 1
- Among eukaryotes, replication of DNA takes place in - Answer: 3. S phase Key idea: DNA replication in eukaryotes takes place in the S (synthesis) phase of interphase. G1 is for cell growth, G2 f... 1
- The process of appearance of recombination nodules occurs at which sub stage of prophase I in meiosis? Answer: 3. Pachytene Key idea: Recombination nodules appear during pachytene, when crossing over takes place between non-sister chromatids o... 1
- In the equationGPP - R = NPPGPP is Gross Primary ProductivityNPP is Net Primary ProductivityR here is ______. Answer: 4. Respiratory loss Key idea: Net primary productivity is the gross primary productivity left after plants use some for their own re... 1
- Unequivocal proof that DNA is the genetic material was first proposed by Answer: 3. Alfred Hershey and Martha Chase Key idea: Hershey and Chase (1952) gave the unequivocal proof that DNA is the genetic material. T... 1
- Spraying of which of the following phytohormone on juvenile conifers helps in hastening the maturity period, that leads to early seed production? Answer: 3. Gibberellic Acid Key idea: Spraying gibberellic acid (GA) on juvenile conifers hastens maturity, so they produce seeds early. ABA... 1
- What is the function of tassels in the corn cob? Answer: 3. To trap pollen grains Key idea: In maize (corn) the tassels are the long, silky styles and stigmas of the female inflorescence (c... 1
- In angiosperm, the haploid, diploid and triploid structures of a fertilized embryo sac sequentially are : Answer: 4. Synergids, Zygote and Primary endosperm nucleus Key idea: In a fertilised embryo sac, count ploidy for each structure. Synergids:... 1
- Large, colourful, fragrant flowers with nectar are seen in : Answer: 2. insect pollinated plants Key idea: Insect-pollinated flowers are large, colourful and fragrant, and offer nectar as a reward. Win... 1
- In tissue culture experiments, leaf mesophyll cells are put in a culture medium to form callus. This phenomenon may be called as : Answer: 3. Dedifferentiation Key idea: When mature, differentiated cells (such as leaf mesophyll) go back to a meristematic state and divide... 1
- Given below are two statements :Statement I : The forces generated by transpiration can lift a xylem-sized column of water over 130 meters height.Statement II : Transpiration cools leaf surfaces sometimes 10 to 15 degrees, by evaporative cooling.In t… Answer: 2. Both Statement I and Statement II are correct. Key idea: Both statements are standard facts about transpiration. Statement I is c... 1
- The historic Convention on Biological Diversity, 'The Earth Summit' was held in Rio de Janeiro in the year : Answer: 3. 1992 Key idea: The Earth Summit (Convention on Biological Diversity) was held at Rio de Janeiro in 1992. The 2002 summit was held... 1
- In gene gun method used to introduce alien DNA into host cells, microparticles of ________ metal are used. Answer: 4. Tungsten or gold Key idea: In the biolistic (gene gun) method, DNA is coated on microscopic particles of tungsten or gold, which... 1
- Movement and accumulation of ions across a membrane against their concentration gradient can be explained by Answer: 1. Active Transport Key idea: Movement of ions against their concentration gradient needs energy (ATP) and carrier proteins, and thi... 1
- Axile placentation is observed in Answer: 1. China rose, Petunia and Lemon Key idea: Axile placentation (ovary with two or more chambers, ovules on central axis) is found in... 1
- Identify the correct statements :A. Detrivores perform fragmentation.B. The humus is further degraded by some microbes during mineralization.C. Water soluble inorganic nutrients go down into the soil and get precipitated by a process called leaching.… Answer: 2. A, B, C only Key idea: Check each statement on decomposition. A is true: detritivores break detritus into smaller pieces (fragmen... 1
- Given below are two statements :Statement I : Endarch and exarch are the terms often used for describing the position of secondary xylem in the plant body.Statement II : Exarch condition is the most common feature of the root system.In the light of t… Answer: 1. Statement I is incorrect but Statement II is true. Key idea: Endarch and exarch describe the position of primary xylem. Statement... 1