#neet

3 questions

Oxygen is *not* produced during photosynthesis by Answer: 1. Green sulphur bacteria Green sulphur bacteria perform anoxygenic photosynthesis using H ₂ S, so they release no oxygen. Cycas (pl... Light reactions, cyclic and non-cyclic photophosphorylation, chemiosmosis 1 answer
Winged pollen grains are present in Answer: 4. *Pinus* Pinus pollen grains have two air bladders (wings), helping wind dispersal. Mustard and mango are insect pollinated, and C... Plant kingdom: algae, bryophytes, pteridophytes, gymnosperms 1 answer
Which part of poppy plant is used to obtain the drug "Smack" ? Answer: 3. Latex Key idea: Smack (brown sugar, heroin) is made by acetylation of morphine. Morphine is obtained from the latex of the opium... Adolescence, drug, alcohol and tobacco abuse 1 answer
The stage during which separation of the paired homologous chromosomes begins is Answer: 3. Diplotene In prophase I, homologous chromosomes start to separate at diplotene, held together at chiasmata. Zygotene is pairing (... Cell cycle, mitosis, meiosis 1 answer
The two functional groups characteristic of sugars are Answer: 4. carbonyl and hydroxyl Sugars are polyhydroxy aldehydes or ketones, so they have a carbonyl group (aldehyde or ketone) and several... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other ? Answer: 3. *Yucca* Yucca and the moth Pronuba are an obligate mutualism; the moth pollinates the flower and lays eggs in the ovary. Neither... Population interactions: mutualism, competition, predation, parasitism 1 answer
Pollen grains can be stored for several years in liquid nitrogen having a temperature of Answer: 2. – 196°C Pollen can be cryopreserved in liquid nitrogen at -196^° C for years. The other temperatures are not that of liquid nitro... Flower structure, male and female gametophytes 1 answer
Which of the following elements is responsible for maintaining turgor in cells ? Answer: 2. Potassium Potassium regulates osmotic potential, so it maintains turgor and opens stomata. Mg is in chlorophyll, Ca is in the mid... Factors affecting photosynthesis 1 answer
What is the role of NAD^+ in cellular respiration ? Answer: 3. It functions as an electron carrier. NAD ^+ is a coenzyme that accepts electrons and hydrogen to become NADH, so it is an electro... Glycolysis and fermentation 1 answer
In which of the following forms is iron absorbed by plants ? Answer: 4. Both ferric and ferrous Plants take up iron mainly as ferric ions (Fe ³⁺ ), and it is also taken as ferrous ions (Fe ²⁺ ). Since... Factors affecting photosynthesis 1 answer
After karyogamy followed by meiosis, spores are produced exogenously in Answer: 2. *Agaricus* In basidiomycetes such as Agaricus, karyogamy and meiosis occur in the basidium, giving basidiospores borne exogenousl... Monera, Protista and Fungi 1 answer
Which one is *wrongly* matched ? Answer: 1. Uniflagellate gametes – *Polysiphonia* Polysiphonia is a red alga with no flagellated stage; its gametes are non-motile. Gemma cu... Plant kingdom: algae, bryophytes, pteridophytes, gymnosperms 1 answer
Match the items given in Column I with those in Column II and select the *correct* option given below :Column I | Column IIa. Herbarium | i. It is a place having a collection of preserved plants and animals.b. Key | ii. A list that enumerates methodi… Answer: 4. a-iii, b-iv, c-i, d-ii Match each term with its definition. Herbarium: dried, pressed plants on sheets (iii). Key: list of charac... Taxonomy and systematics, species, taxonomic hierarchy, binomial nomenclature 1 answer
Which of the following is an amino acid derived hormone ? Answer: 1. Epinephrine Key idea: Hormones made from amino acids (amines, peptides, proteins) differ from steroid hormones made from choleste... Endocrine glands and hormones, mechanism of action 1 answer
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... Neural control: neuron, nervous system, nerve impulse 1 answer
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... Neural control: neuron, nervous system, nerve impulse 1 answer
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... Endocrine glands and hormones, mechanism of action 1 answer
Among the following sets of examples for divergent evolution, select the incorrect option : Answer: 4. Eye of octopus, bat and man Key idea: Divergent evolution means homologous organs (same origin) adapted to different functions. O... Evidences of evolution 1 answer
Which of the following is not an autoimmune disease ? Answer: 2. Alzheimer's disease In an autoimmune disease the immune system attacks the body's own tissues. Psoriasis, rheumatoid arthritis an... Immunology basics and vaccines 1 answer
Which of the following characteristics represent 'Inheritance of blood groups' in humans ?a. Dominanceb. Co-dominancec. Multiple alleled. Incomplete dominancee. Polygenic inheritance Answer: 3. a, b and c Key idea: ABO blood group inheritance is controlled by one gene with three alleles I^A, I^B, i . Multiple alleles: thr... Deviations: incomplete dominance, co-dominance, multiple alleles, blood groups, pleiotropy, polygenic inheritance 1 answer
In which disease does mosquito transmitted pathogen cause chronic inflammation of lymphatic vessels ? Answer: 1. Elephantiasis Key idea: Filarial worms (Wuchereria) are spread by Culex mosquitoes and live in lymphatic vessels. They cause chro... Pathogens and parasites causing human diseases 1 answer
The similarity of bone structure in the forelimbs of many vertebrates is an example of Answer: 1. Homology Key idea: Similar bone structure in the forelimbs of different vertebrates shows a common ancestral origin, which is hom... Evidences of evolution 1 answer
Conversion of milk to curd improves its nutritional value by increasing the amount of Answer: 2. Vitamin B ₁₂ Key idea: Lactic acid bacteria (LAB) turn milk into curd. LAB also add to the nutritional value of curd by increasin... Microbes in household food processing 1 answer
Which one of the following population interactions is widely used in medical science for the production of antibiotics ? Answer: 4. Amensalism Key idea: In amensalism one species is harmed while the other is unaffected. Antibiotics are chemicals secreted by mic... Microbes in industrial production 1 answer

← Previous

Page 58 of 86