#neet
- Which part of the brain is responsible for thermoregulation ? Answer: 2. Hypothalamus The hypothalamus contains the thermoregulatory centre. It also controls hunger, thirst and hormone release. The cere... 1
- Consider following features :(a) Organ system level of organisation(b) Bilateral symmetry(c) True coelomates with segmentation of bodySelect the correct option of animal groups which possess all the above characteristics. Answer: 1. Annelida, Arthropoda and Chordata We need a group with organ-system organisation, bilateral symmetry and a true coelom with segme... 1
- Select the correct sequence of organs in the alimentary canal of cockroach starting from mouth : Answer: 1. Pharynx → Oesophagus → Crop → Gizzard → Ileum → Colon → Rectum The cockroach alimentary canal runs: mouth, pharynx, oesophagus, c... 1
- Which of the following pairs of gases is mainly responsible for green house effect ? Answer: 4. Carbon dioxide and Methane The main greenhouse gases are CO₂ , CH₄ , N₂O and CFCs. Among the options, carbon dioxide and methane... 1
- Which of the following muscular disorders is inherited ? Answer: 2. Muscular dystrophy Muscular dystrophy is a genetic (X-linked) disorder causing progressive degeneration of skeletal muscle. Tetan... 1
- The ciliated epithelial cells are required to move particles or mucus in a specific direction. In humans, these cells are mainly present in : Answer: 4. Bronchioles and Fallopian tubes Ciliated epithelium moves mucus and particles in one direction. In humans it lines the bronchiole... 1
- Match the Column - I with Column - II :Column - I | Column - II(a) P - wave | (i) Depolarisation of ventricles(b) QRS complex | (ii) Repolarisation of ventricles(c) T - wave | (iii) Coronary ischemia(d) Reduction in the size of T - wave | (iv) Depola… Answer: 1. (a) (iv) (b) (i) (c) (ii) (d) (iii) Link each ECG part to the cardiac event. P-wave: depolarisation of the atria, so (iv). QRS co... 1
- Which one of the following is not a method of *in situ* conservation of biodiversity ? Answer: 3. Botanical Garden In situ conservation protects species in their natural habitat: biosphere reserves, sanctuaries, national parks... 1
- In a species, the weight of newborn ranges from 2 to 5 kg. 97% of the newborn with an average weight between 3 to 3.3 kg survive whereas 99% of the infants born with weights from 2 to 2.5 kg or 4.5 to 5 kg die. Which type of selection process is taki… Answer: 2. Stabilizing Selection Here the average-weight babies survive and both extremes (very light and very heavy) die. Selection favours... 1
- How does steroid hormone influence the cellular activities ? Answer: 2. Binding to DNA and forming a gene-hormone complex. Steroid hormones are lipid-soluble, so they enter the cell and bind to intrace... 1
- Which of the following statements is not correct ? Answer: 4. Lysosomes are formed by the process of packaging in the endoplasmic reticulum. Lysosomes are membrane-bound vesicles holding hydr... 1
- Which one of the following statements regarding post-fertilization development in flowering plants is incorrect ? Answer: 4. Ovules develop into embryo sac After fertilisation: ovary becomes fruit, ovule becomes seed, zygote becomes embryo, and the prima... 1
- Which one of the following equipments is essentially required for growing microbes on a large scale, for industrial production of enzymes ? Answer: 4. Bioreactor Large-scale culture of microbes for products such as enzymes needs a bioreactor, which gives controlled temperature, p... 1
- Consider the following statements :(A) Coenzyme or metal ion that is tightly bound to enzyme protein is called prosthetic group.(B) A complete catalytic active enzyme with its bound prosthetic group is called apoenzyme.Select the correct option. Answer: 2. (A) is true but (B) is false. Statement A is true. A cofactor (organic or metal ion) that is tightly bound to the enzyme protein... 1
- Select the correct sequence for transport of sperm cells in male reproductive system. Answer: 2. Seminiferous tubules → Rete testis → Vasa efferentia → Epididymis → Vas deferens → Ejaculatory duct → Urethra → Urethral meatus S... 1
- Match the hominids with their correct brain size :(a) *Homo habilis* (i) 900 cc(b) *Homo neanderthalensis* (ii) 1350 cc(c) *Homo erectus* (iii) 650 - 800 cc(d) *Homo sapiens* (iv) 1400 ccSelect the correct option. Answer: 3. (a) (iii) (b) (iv) (c) (i) (d) (ii) Brain sizes: Homo habilis 650-800 cc, Homo erectus about 900 cc, Homo sapiens about 1350 cc,... 1
- Variations caused by mutation, as proposed by Hugo de Vries, are : Answer: 2. random and directionless Hugo de Vries proposed mutation theory. Mutations are large, sudden changes that are random and directio... 1
- Which of the following pair of organelles does not contain DNA ? Answer: 3. Lysosomes and Vacuoles Mitochondria and chloroplasts contain their own DNA, and the nucleus holds the cell's DNA. Lysosomes and v... 1
- Due to increasing air-borne allergens and pollutants, many people in urban areas are suffering from respiratory disorder causing wheezing due to : Answer: 2. inflammation of bronchi and bronchioles. Wheezing is typical of asthma, which is inflammation of the bronchi and bronchioles caus... 1
- Select the incorrect statement. Answer: 3. In domesticated fowls, sex of progeny depends on the type of sperm rather than egg. We look for the incorrect statement. Male fru... 1
- Which of the following is an amphoteric hydroxide ? Answer: 4. Be(OH) ₂ Going down group 2, hydroxides become more basic. Sr(OH)₂ , Ca(OH)₂ and Mg(OH)₂ are basic. Be(OH)₂ dissolves in both aci... 1
- Which one is malachite from the following ? Answer: 4. CuCO ₃ .Cu(OH) ₂ Malachite is the green basic copper carbonate CuCO₃· Cu(OH)₂ . CuFeS₂ is copper pyrites and Fe₃O₄ is magnetite.... 1
- Among the following, the reaction that proceeds through an electrophilic substitution, is : Answer: 2. (structure 2, see figure): benzene + Cl ₂ xrightarrowAlCl₃ chlorobenzene + HCl (1) Sandmeyer reaction: via aryl radical / diazoni... 1
- The mixture that forms maximum boiling azeotrope is : Answer: 1. Water + Nitric acid Maximum boiling azeotropes come from solutions with negative deviation from Raoult's law. Nitric acid and wat... 1