#neet
- Serum differs from blood in Answer: 2. lacking clotting factors Serum is plasma without the clotting factors (fibrinogen and others), or in other words the fluid left a... 1
- Which of the following is hormone-releasing IUD? Answer: 4. LNG-20 IUDs are of three kinds: non-medicated (Lippes loop), copper releasing (Cu7, Multiload 375, CuT) and hormone releasing (Pr... 1
- Which one of the following is wrong for fungi? Answer: 1. All fungi possess a purely cellulosic cell wall. Fungal cell walls are made of chitin and other polysaccharides, not purely cellu... 1
- Select the wrong statement. Answer: 4. The walls of diatoms are easily destructible. Diatom cell walls are made of silica and are indestructible, so statement 4 is wron... 1
- Conifers are adapted to tolerate extreme environmental conditions because of Answer: 2. thick cuticle Conifers grow in cold, dry conditions. A thick cuticle and sunken stomata, with needle-like leaves, reduce water lo... 1
- Which one of the following statements is wrong ? Answer: 1. Algin is obtained from red algae, and carrageenan from brown algae. The statement is reversed. Algin comes from brown algae and c... 1
- How many plants among *Indigofera*, *Sesbania*, *Salvia*, *Allium*, *Aloe*, mustard, groundnut, radish, gram and turnip have stamens with different lengths in their flowers? Answer: 1. Four Count the plants whose flowers have stamens of unequal length. Salvia: only two stamens, with unequal arms and a lever-like... 1
- Cortex is the region found between Answer: 4. epidermis and stele The cortex is the ground tissue that lies between the epidermis and the stele (the vascular region enclosed b... 1
- The balloon-shaped structures called tyloses Answer: 2. are extensions of xylem parenchyma cells into vessels Tyloses are balloon-like outgrowths of xylem parenchyma cells that protrude... 1
- Match the stages of meiosis in Column—I to their characteristic features in Column—II and select the correct option using the codes given below :Column—I: a. Pachytene; b. Metaphase I; c. Diakinesis; d. ZygoteneColumn—II: (i) Pairing of homologous ch… Answer: 4. (iii) (iv) (ii) (i) Each stage of meiotic prophase I has one signature event. Pachytene: crossing-over between non-sister chromat... 1
- Which hormones do stimulate the production of pancreatic juice and bicarbonate? Answer: 2. Cholecystokinin and secretin Hormones of the gut control pancreatic secretion. Secretin acts on pancreatic acinar cells to releas... 1
- The partial pressure of oxygen in the alveoli of the lungs is Answer: 1. more than that in the blood Gases move from higher to lower partial pressure (pO₂). Alveolar pO₂ is about 104 mm Hg, while deoxyg... 1
- Choose the correct statement. Answer: 2. Photoreceptors in the human eye are depolarized during darkness and become hyperpolarized in response to the light stimulus. Go t... 1
- Graves' disease is caused due to Answer: 1. hypersecretion of thyroid gland Graves' disease is a form of hyperthyroidism, an autoimmune disease in which antibodies stimulate... 1
- Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction. Answer: 4. Calcium When a nerve signal reaches the muscle, Ca²⁺ is released from the sarcoplasmic reticulum. Ca²⁺ binds to troponin on the t... 1
- Name the blood cells, whose reduction in number can cause clotting disorder, leading to excessive loss of blood from the body. Answer: 3. Thrombocytes Thrombocytes (platelets) release clotting factors and form the platelet plug at an injury. A fall in their number (t... 1
- Name a peptide hormone which acts mainly on hepatocytes, adipocytes and enhances cellular glucose uptake and utilization. Answer: 4. Insulin Insulin is a peptide hormone from the beta cells of the pancreas. It acts mainly on hepatocytes and adipocytes (and muscl... 1
- Osteoporosis, an age-related disease of skeletal system, may occur due to Answer: 2. decreased level of estrogen Osteoporosis is a loss of bone mass that makes bones fragile. It is common after menopause or in old... 1
- Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because Answer: 1. there is a negative intrapleural pressure pulling at the lung walls The pleural cavity around each lung has a pressure lower than... 1
- The posterior pituitary gland is not a 'true' endocrine gland because Answer: 1. it only stores and releases hormones The posterior pituitary (neurohypophysis) does not make its own hormones. Oxytocin and vasop... 1
- The part of nephron involved in active reabsorption of sodium is Answer: 1. proximal convoluted tubule The proximal convoluted tubule (PCT) reabsorbs about 70 to 80 percent of the filtered Na⁺ (with water,... 1
- Which of the following is incorrect regarding vasectomy? Answer: 1. No sperm occurs in epididymis In vasectomy the vasa deferentia are cut and tied, so sperm cannot reach the seminal fluid. The ste... 1
- Embryo with more than 16 blastomeres formed due to in vitro fertilization is transferred into Answer: 4. uterus In IVF-ET, an embryo with up to 8 blastomeres is transferred into the fallopian tube (ZIFT). An embryo with more than 8 bl... 1
- During cell growth, DNA synthesis takes place in Answer: 4. S phase In the cell cycle, DNA replication happens in the S (synthesis) phase of interphase. G₁ is for cell growth and preparing... 1