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Receptor sites for neurotransmitters are present on

1) Membranes of synaptic vesicles 2) Presynaptic membrane 3) Tips of axons 4) Postsynaptic membrane Answer: 4) Postsynaptic membrane... View Article

Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by

1) Water 2) Bee 3) Wind 4) Bat Answer: 3) Wind Explanation: Single ovule in the ovary and many flowers packed into inflorescence are usually... View Article

Root hairs develop from the region of

1) Maturation 2) Elongation 3) Root cap 4) Meristematic activity Answer:1) Maturation Explanation: Root hairs develop from the zone of... View Article

Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without

1)Bacillus 2)Pseudomonas 3) Mycoplasma 4) Nostoc Answer:3) Mycoplasma Explanation: Mycoplasma is the smallest living known cell. It is... View Article

Life cycle of Ectocarpus and Fucus respectively are

1) Haplontic, Diplontic 2) Diplontic, Haplodiplontic 3) Haplodiplontic, Diplontic 4) Haplodiplontic, Haplontic Answer: 3) Haplodiplontic,... View Article

Zygotic meiosis is characteristic of

1) Marchantia 2) Fucus 3) Funaria 4) Chlamydomonas Answer: 4) Chlamydomonas Explanation: Many algae have a haplontic life cycle. The zygote... View Article

What is the criterion for DNA fragments movement on agarose gel during gel electrophoresis?

1) The larger the fragment size, the farther it moves 2) The smaller the fragment size, the farther it moves 3) Positively charged fragments... View Article

Which of the following is correctly matched for the product produced by them?

1) Acetobacter aceti : Antibiotics 2) Methanobacterium : Lactic acid 3) Penicillium notatum : Acetic acid 4) Saccharomyces cerevisiae :... View Article

Presence of plants arranged into well defined vertical layers depending on their height can be seen best in

1) Tropical Savannah 2) Tropical Rainforest 3) Grassland 4) Temperate Forest Answer:2) Tropical Rainforest Explanation: The vertical... View Article

The function of copper ions in copper releasing IUD’s is

1) They suppress sperm motility and fertilising capacity of sperms 2) They inhibit gametogenesis 3) They make the uterus unsuitable for... View Article

The DNA fragments separated on an agarose gel can be visualised after staining with

1) Bromophenol blue 2) Acetocarmine 3) Aniline blue 4) Ethidium bromide Answer:4) Ethidium bromide Explanation: The separated DNA segments... View Article

Which one from those given below is the period for Mendel’s hybridization experiments?

1) 1856-1863 2) 1840-1850 3) 1857-1869 4) 1870-1877 Answer: 1) 1856-1863 Explanation: Mendel conducted his hybridization experiments on... View Article

Spliceosomes are not found in cells of

1) Plants 2) Fungi 3) Animals 4) Bacteria Answer: 4) Bacteria Explanation: Spliceosomes are used in the removal of introns from hnRNA... View Article

Which of the following options gives the correct sequence of events during mitosis?

1) condensation→ nuclear membrane disassembly→ crossing over→ segregation→ telophase 2) condensation→ nuclear membrane disassembly→ arrangement... View Article

Homozygous purelines in cattle can be obtained by

1) mating of related individuals of the same breed 2) mating of unrelated individuals of the same breed 3) mating of individuals of a different... View Article

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?

1) Light saturation for CO2 fixation occurs at 10% of full sunlight 2) Increasing atmospheric CO2 concentration up to 0.05% can enhance CO2... View Article

The association of histone H1 with a nucleosome indicates

1) Transcription is occurring 2) DNA replication is occurring 3) The DNA is condensed into a Chromatin Fibre 4) The DNA double helix is... View Article

Which of the following cell organelles is responsible for extracting energy from carbohydrates to form ATP?

1) Lysosome 2) Ribosome 3) Chloroplast 4) Mitochondrion Answer: 4) Mitochondrion Explanation: Complete oxidation of carbohydrates takes... View Article

A baby boy aged two years is admitted to play school and passes through a dental check-up. The dentist observed that the boy had twenty teeth. Which teeth were absent?

1) Incisors 2) Canines 3) Premolars 4) Molars Answer: 3) Premolars Explanation: Most mammals including humans have two sets of teeth in... View Article

Which of the following is made up of dead cells?

1) Xylem parenchyma 2) Collenchyma 3) Phellem 4) Phloem Answer: 3) Phellem Explanation: Phellem is made up of dead cells. It is suberised... View Article

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