#neet
- In the following palindromic base sequences of DNA, which one can be cut easily by particular restriction enzyme ? Answer: 3. 5'GAATTC3'; 3'CTTAAG5' A palindromic site reads the same 5' to 3' on both strands. 5'GAATTC3' with complementary 3'CTTAAG5' is a... 1
- Match the plant with the kind of life cycle it exhibits :List - I: (a) Spirogyra (b) Fern (c) Funaria (d) CycasList - II: (i) Dominant diploid sporophyte vascular plant, with highly reduced male or female gametophyte (ii) Dominant haploid free-living… Answer: 3. (a) - (ii), (b) - (iii), (c) - (iv), (d) - (i) Spirogyra: dominant haploid free-living gametophyte, (ii). Fern: dominant diploid... 1
- While explaining interspecific interaction of population, (+) sign is assigned for beneficial interaction, (-) sign is assigned for detrimental interaction and (0) for neutral interaction. Which of the following interactions can be assigned (+) for o… Answer: 2. Predation Predation is (+) for the predator and (-) for the prey. Competition is (-,-), amensalism is (-,0) and commensalism is (... 1
- Transposons can be used during which one of the following ? Answer: 3. Gene silencing As per the official key, the answer is gene silencing: transposons (jumping genes) can insert in or near a gene an... 1
- Match List - I with List - II.List - I: (a) Metacentric chromosome (b) Acrocentric chromosome (c) Sub-metacentric chromosome (d) Telocentric chromosomeList - II: (i) Centromere situated close to the end forming one extremely short and one very long a… Answer: 2. (a) - (iii), (b) - (i), (c) - (iv), (d) - (ii) Metacentric: centromere in the middle, two equal arms, (iii). Acrocentric: centrom... 1
- Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) :Mendel's law of Independent assortment does not hold good for the genes that are located closely on the same chromosome.Reason (R… Answer: 4. (A) is correct but (R) is not correct Assertion: genes close together on the same chromosome are linked and tend to be inherited... 1
- Which of the following statements with respect to Endoplasmic Reticulum is incorrect ? Answer: 4. In prokaryotes only RER are present Key idea: Prokaryotes have no endoplasmic reticulum at all, because they lack membrane-bound... 1
- Regarding Meiosis, which of the statements is incorrect ? Answer: 3. DNA replication occurs in S phase of Meiosis-II Key idea: DNA replicates only once in meiosis, in the S phase before meiosis I. M... 1
- Given below are two statements :Statement I :The coagulum is formed of network of threads called thrombins.Statement II :Spleen is the graveyard of erythrocytes.In the light of the above statements, choose the most appropriate answer from the options… Answer: 1. Statement I is incorrect but Statement II is correct Key idea: The clot is made of fibrin, not thrombin. Statement I: the coagulu... 1
- Given below are two statements :Statement I :Restriction endonucleases recognise specific sequence to cut DNA known as palindromic nucleotide sequence.Statement II :Restriction endonucleases cut the DNA strand a little away from the centre of the pal… Answer: 2. Both Statement I and Statement II are correct Key idea: Restriction enzymes recognise palindromic sequences and cut each strand s... 1
- Identify the asexual reproductive structure associated with Penicillium : Answer: 3. Conidia Key idea: Penicillium is a fungus that reproduces asexually by conidia. Conidia are borne on conidiophores, so option 3 i... 1
- Nitrogenous waste is excreted in the form of pellet or paste by : Answer: 1. Pavo Key idea: Birds are uricotelic. Their uric acid leaves as a semi-solid pellet or paste, which saves water. Pavo (peacock) is... 1
- Which of the following is present between the adjacent bones of the vertebral column ? Answer: 3. Cartilage Key idea: Adjacent vertebrae are separated by intervertebral discs made of fibrocartilage. These cartilaginous discs ac... 1
- Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) :All vertebrates are chordates but all chordates are not vertebrates.Reason (R) :Notochord is replaced by vertebral column in the… Answer: 2. Both (A) and (R) are correct and (R) is the correct explanation of (A) Key idea: Chordates have a notochord. In vertebrates it is... 1
- Lippe's loop is a type of contraceptive used as : Answer: 4. Non-Medicated IUD Key idea: Lippes loop is a plastic, inert intrauterine device. IUDs come in three types: non-medicated (Lippes... 1
- At which stage of life the oogenesis process is initiated ? Answer: 3. Embryonic development stage Key idea: Oogenesis begins before birth, during the embryonic stage. Oogonia form in the foetal ovary... 1
- Which of the following is not a connective tissue ? Answer: 1. Neuroglia Key idea: Neuroglia are supporting cells of nervous tissue. Blood, adipose tissue and cartilage are all connective tiss... 1
- XO type of sex determination can be found in : Answer: 4. Grasshoppers XO sex determination (male has one X, female XX) is found in grasshoppers. Monkeys and Drosophila have XY males, and... 1
- Exoskeleton of arthropods is composed of : Answer: 4. Chitin The arthropod exoskeleton is made of chitin, a polymer of N-acetylglucosamine. Glucosamine is only its monomer unit, cutin... 1
- Production of Cucumber has increased manifold in recent years. Application of which of the following phytohormones has resulted in this increased yield as the hormone is known to produce female flowers in the plants : Answer: 4. Ethylene Ethylene promotes female flowers in cucumber, which increases fruit yield. Gibberellins in cucumber tend to promote male... 1
- Which one of the following statement is not true regarding gel electrophoresis technique ? Answer: 4. The presence of chromogenic substrate gives blue coloured DNA bands on the gel. In gel electrophoresis, DNA fragments are stained... 1
- In old trees the greater part of seco[...] dark brown and resistant to insect attack due [...](a) secretion of secondary metabolites and their deposition in the lumen of vessels.(b) deposition of organic compounds like tannins and resins in the centr… Answer: 2. (a) and (b) Only Heartwood is dark brown and resistant to insects and microbes because of chemical deposits in the central, old x... 1
- Which of the following is incorrectly matched ? Answer: 3. Ulothrix - Mannitol Green algae like Ulothrix store starch, not mannitol. Mannitol is the reserve food in brown algae. Other pair... 1
- Which one of the following plants does not show plasticity ? Answer: 1. Maize Plasticity means a plant shows different forms in response to environment or life phase, such as heterophylly. Cotton, cori... 1