NEET UG
- Which of the following hormones can play a significant role in osteoporosis ? Answer: 2. Estrogen and Parathyroid hormone Key idea: Osteoporosis is loss of bone mass, linked to low estrogen and to calcium regulation. E... 1
- Which of the following structures or regions is incorrectly paired with its function ? Answer: 3. Limbic system : consists of fibre tracts that interconnect different regions of brain; controls movement. Key idea: Find the pair... 1
- The transparent lens in the human eye is held in its place by Answer: 1. ligaments attached to the ciliary body Key idea: The lens is suspended by the suspensory ligaments (zonular fibres). These ligame... 1
- Which of the following is true for nucleolus ? Answer: 4. It is a site for active ribosomal RNA synthesis. The nucleolus is a non-membranous site of active rRNA synthesis and ribosome ass... 1
- The Golgi complex participates in Answer: 3. Formation of secretory vesicles The Golgi complex packs and sorts proteins and lipids into vesicles, including secretory vesicles... 1
- Select the *wrong* statement : Answer: 2. Pseudopodia are locomotory and feeding structures in Sporozoans. Sporozoans (e.g. Plasmodium) have no locomotory organs, so the s... 1
- Which among the following is *not* a prokaryote ? Answer: 1. *Saccharomyces* Saccharomyces is yeast, a unicellular fungus, so it is a eukaryote. Nostoc and Oscillatoria are cyanobacteria and... 1
- World Ozone Day is celebrated on Answer: 2. 16 ^th September World Ozone Day marks the signing of the Montreal Protocol on 16 September 1987. 5 June is World Environment Day... 1
- In stratosphere, which of the following elements acts as a catalyst in degradation of ozone and release of molecular oxygen ? Answer: 3. Cl UV rays split chlorofluorocarbons and release chlorine atoms, which act as catalysts in converting ozone to molecular oxygen.... 1
- Which of the following is a secondary pollutant ? Answer: 4. O ₃ A secondary pollutant is formed in the air by reactions of primary pollutants; ozone is formed from NO _x and hydrocarbons in... 1
- What type of ecological pyramid would be obtained with the following data ?Secondary consumer : 120 gPrimary consumer : 60 gPrimary producer : 10 g Answer: 1. Inverted pyramid of biomass A pyramid of biomass is inverted when higher trophic levels have more biomass than lower ones. Here b... 1
- Natality refers to Answer: 3. Birth rate Natality is the birth rate of a population, the number of births per unit time. Death rate is mortality; leaving the h... 1
- Niche is Answer: 4. the functional role played by the organism where it lives Niche is the functional role of an organism in its habitat, including i... 1
- Select the *correct* statement : Answer: 3. Punnett square was developed by a British scientist. The Punnett square, a tool to show gamete combinations in a cross, was devis... 1
- Which of the following pairs is *wrongly* matched ? Answer: 1. Starch synthesis in pea : Multiple alleles Starch synthesis in pea is an example of pleiotropy (one gene, many effects), not mult... 1
- Select the *correct* match : Answer: 4. Francois Jacob and Jacques Monod – *Lac* operon Jacob and Monod proposed the lac operon model of gene regulation in E. coli. Jeff... 1
- The experimental proof for semiconservative replication of DNA was first shown in a Answer: 3. Bacterium Meselson and Stahl showed semiconservative replication in 1958 using E. coli. They grew the bacteria in ¹⁵ N medium, sh... 1
- Select the *correct* match : Answer: 1. Ribozyme – Nucleic acid A ribozyme is an RNA molecule with catalytic activity, so it is a nucleic acid. Morgan is linked to linka... 1
- Stomatal movement is *not* affected by Answer: 2. O ₂ concentration Stomata respond to light, CO ₂ level, temperature and water status, but not to O ₂ concentration. Low CO ₂ and... 1
- Which of the following is *not* a product of light reaction of photosynthesis ? Answer: 3. NADH The light reaction makes ATP and NADPH and releases O ₂ from photolysis of water. NADH is a respiration carrier, not a produ... 1
- Offsets are produced by Answer: 3. Mitotic divisions Offsets are vegetative propagules formed by mitosis, so the new plants are clones. They are seen in aquatic pla... 1
- Which of the following flowers only once in its life-time ? Answer: 1. Bamboo species Some plants are monocarpic and flower only once in life; bamboo flowers once after about 50 to 100 years and then... 1
- Which of the following has proved helpful in preserving pollen as fossils ? Answer: 4. Sporopollenin Sporopollenin, the material of the pollen exine, is extremely resistant to heat, acids, alkalis and enzymes. So the... 1
- Sweet potato is a modified Answer: 3. Adventitious root Sweet potato is a root that stores food, and it arises from a non-root part, so it is an adventitious root. Tap... 1