NEET UG
- Which of the following characteristics is incorrect with respect to cockroach ? Answer: 1. A ring of gastric caeca is present at the junction of midgut and hind gut. The incorrect statement is the one about gastric caeca... 1
- Match List - I with List - II.List - I | List - II(a) Protoplast fusion | (i) Totipotency(b) Plant tissue culture | (ii) Pomato(c) Meristem culture | (iii) Somaclones(d) Micropropagation | (iv) Virus free plantsChoose the correct answer from the opti… Answer: 2. (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii) Match each technique with its outcome: Protoplast fusion gives somatic hybrids such as pom... 1
- Which of the following are not secondary metabolites in plants ? Answer: 2. Amino acids, glucose Secondary metabolites include alkaloids (morphine, codeine), terpenoids (vinblastin), pigments and drugs (cu... 1
- Which of the following stages of meiosis involves division of centromere ? Answer: 3. Anaphase II In meiosis, sister chromatids separate only in anaphase II, when the centromere splits and each chromatid becomes a s... 1
- Which of the following is an incorrect statement ? Answer: 1. Mature sieve tube elements possess a conspicuous nucleus and usual cytoplasmic organelles. Find the incorrect statement. Statemen... 1
- When the centromere is situated in the middle of two equal arms of chromosomes, the chromosome is referred as : Answer: 1. Metacentric The position of the centromere decides chromosome type. A centromere in the middle, giving two equal arms, makes the... 1
- Match List - I with List - II.List - I | List - II(a) Cristae | (i) Primary constriction in chromosome(b) Thylakoids | (ii) Disc-shaped sacs in Golgi apparatus(c) Centromere | (iii) Infoldings in mitochondria(d) Cisternae | (iv) Flattened membranous… Answer: 3. (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii) Match each structure with its description: Cristae are infoldings of the inner mitochondri... 1
- Which of the following algae produce Carrageen ? Answer: 3. Red algae Carrageen is a hydrocolloid obtained from the cell walls of red algae (for example Chondrus). Brown algae give algin, a... 1
- Which of the following plants is monoecious ? Answer: 2. Chara A monoecious plant bears male and female reproductive organs on the same plant. Chara is monoecious. Papaya, Marchantia pol... 1
- Genera like Selaginella and Salvinia produce two kinds of spores. Such plants are known as : Answer: 4. Heterosporous Plants that produce two kinds of spores, small microspores and large megaspores, are heterosporous. Selaginella and... 1
- Which of the following algae contains mannitol as reserve food material ? Answer: 1. Ectocarpus Ectocarpus is a brown alga. Brown algae store food as laminarin and mannitol. Gracilaria is red (floridean starch), wh... 1
- The amount of nutrients, such as carbon, nitrogen, phosphorus and calcium present in the soil at any given time, is referred as : Answer: 3. Standing state The amount of nutrients such as C, N, P and Ca present in the soil at a given time is the standing state. Standing... 1
- Which of the following statements is not correct ? Answer: 2. Pyramid of biomass in sea is generally upright. Find the statement that is not correct. In the sea, producers are tiny phytoplank... 1
- Complete the flow chart on central dogma.(a) DNA (with circular arrow) --(b)--> mRNA --(c)--> (d) Answer: 3. (a)-Replication; (b)-Transcription; (c)-Translation; (d)-Protein The central dogma is DNA to mRNA to protein. The circular arrow... 1
- Mutations in plant cells can be induced by : Answer: 3. Gamma rays Mutations are induced by mutagens such as gamma rays, which are ionising radiation and damage DNA. Kinetin and zeatin... 1
- Match List - I with List - II.List - I | List - II(a) Cohesion | (i) More attraction in liquid phase(b) Adhesion | (ii) Mutual attraction among water molecules(c) Surface tension | (iii) Water loss in liquid phase(d) Guttation | (iv) Attraction towar… Answer: 1. (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii) Match the terms with their meanings: Cohesion is mutual attraction among water molecules:... 1
- The first stable product of CO_2 fixation in sorghum is : Answer: 2. Oxaloacetic acid Sorghum is a C4 plant. Its mesophyll cells fix CO ₂ with PEP carboxylase, so the first stable product is a 4-car... 1
- Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called : Answer: 3. Plasticity The ability of a plant to form different structures in response to its environment or its phase of life is called plas... 1
- The site of perception of light in plants during photoperiodism is : Answer: 4. Leaf In photoperiodism the stimulus is perceived by the leaves. A leaf exposed to the right photoperiod can send a flowering sign... 1
- The plant hormone used to destroy weeds in a field is : Answer: 3. 2, 4-D 2,4-D is a synthetic auxin that kills dicot weeds without harming monocot crops such as wheat and maize. IAA, NAA and IBA... 1
- A typical angiosperm embryo sac at maturity is : Answer: 1. 8-nucleate and 7-celled A typical (Polygonum-type) embryo sac forms from the megaspore by three mitotic divisions, giving 8 nucle... 1
- The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which, during pollination, brings genetically different types of pollen grains to stigma, is : Answer: 1. Xenogamy Pollen transfer from the anther of one plant to the stigma of a genetically different plant is xenogamy, and it brings g... 1
- Diadelphous stamens are found in : Answer: 3. Pea In diadelphous stamens, filaments are fused into two bundles. Pea (Fabaceae) has 9 fused plus 1 free stamen, (9)+1 . China ro... 1
- Match List - I with List - II.List - I | List - II(a) Lenticels | (i) Phellogen(b) Cork cambium | (ii) Suberin deposition(c) Secondary cortex | (iii) Exchange of gases(d) Cork | (iv) PhellodermChoose the correct answer from the options given below. Answer: 2. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii) Match the structures with their roles: Lenticels allow exchange of gases: (a)-(iii). Cork... 1