Botany
- 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
- 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
- The entire fleet of buses in Delhi were converted to CNG from diesel. In reference to this, which one of the following statements is false ? Answer: 3. The same diesel engine is used in CNG buses making the cost of conversion low The false statement is that the same diesel engine... 1
- Which one of the following will accelerate phosphorus cycle ? Answer: 4. Weathering of rocks Phosphorus comes mainly from rocks, and weathering of rocks releases phosphates into the soil, which speeds u... 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
- If a geneticist uses the blind approach for sequencing the whole genome of an organism, followed by assignment of function to different segments, the methodology adopted by him is called as : Answer: 2. Sequence annotation In the sequence annotation approach, the whole genome is sequenced blindly and functions are assigned to segm... 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 occurs due to the presence of autosome linked dominant trait ? Answer: 3. Myotonic dystrophy Myotonic dystrophy is an autosomal dominant disorder. Thalassemia and sickle cell anaemia are autosomal recess... 1
- What is the role of large bundle shealth cells found around the vascular bundles in C_4 plants ? Answer: 3. To increase the number of chloroplast for the operation of Calvin cycle The large bundle sheath cells of C₄ plants hold many chlo... 1
- Which part of the fruit, labelled in the given figure makes it a false fruit ? Answer: 4. C → Thalamus A false fruit develops from parts other than the ovary, here the thalamus. In the figure (apple), the large outer fl... 1
- The anatomy of springwood shows some peculiar features. Identify the correct set of statements about springwood.(a) It is also called as the earlywood(b) In spring season cambium produces xylem elements with narrow vessels(c) It is lighter in colour(… Answer: 3. (a), (c), (d) and (e) Only (a) Springwood is also called earlywood: true. (b) It has wide vessels, not narrow: false. (c) It is l... 1
- Which one of the following produces nitrogen fixing nodules on the roots of Alnus ? Answer: 3. Frankia Frankia is the actinomycete that forms nitrogen-fixing root nodules in non-leguminous plants such as Alnus. Rhizobium nod... 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
- Read the following statements and choose the set of correct statements :(a) Euchromatin is loosely packed chromatin(b) Heterochromatin is transcriptionally active(c) Histone octomer is wrapped by negatively charged DNA in nucleosome(d) Histones are r… Answer: 3. (a), (c), (d) Only (a) Euchromatin is loosely packed and transcriptionally active: true. (b) Heterochromatin is densely packed an... 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
- Habitat loss and fragmentation, over exploitation, alien species invasion and co-extinction are causes for : Answer: 4. Biodiversity loss Habitat loss and fragmentation, over-exploitation, alien species invasion and co-extinction are the four major... 1
- Which of the following is not a method of ex situ conservation ? Answer: 3. National Parks National parks protect organisms in their natural habitat, so they are in situ conservation. Cryopreservation, in... 1
- Which one of the following statements cannot be connected to Predation ? Answer: 4. Both the interacting species are negatively impacted In predation, one species (predator) benefits (+) and the other (prey) is ha... 1
- Given below are two statements :Statement I :Decomposition is a process in which the detritus is degraded into simpler substances by microbes.Statement II :Decomposition is faster if the detritus is rich in lignin and chitinIn the light of the above… Answer: 4. Statement I is correct but Statement II is incorrect Statement I: decomposition breaks detritus into simpler substances through m... 1
- Given below are two statements :Statement I :Mendel studied seven pairs of contrasting traits in pea plants and proposed the Laws of InheritanceStatement II :Seven characters examined by Mendel in his experiment on pea plants were seed shape and colo… Answer: 2. Both Statement I and Statement II are correct Mendel studied seven pairs of contrasting traits in pea and proposed the laws of in... 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
- The process of translation of mRNA to proteins begins as soon as : Answer: 2. The small subunit of ribosome encounters mRNA Translation begins when the small ribosomal subunit binds to the mRNA. Then the ini... 1
- Given below are two statements :Statement I :The primary CO_2 acceptor in C_4 plants is phosphoenolpyruvate and is found in the mesophyll cells.Statement II :Mesophyll cells of C_4 plants lack RuBisCo enzyme.In the light of the above statements, choo… Answer: 2. Both Statement I and Statement II are correct Statement I: in C₄ plants PEP, a three-carbon compound, is the primary CO₂ acceptor... 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