Questions
What is the correct sequence of ecological complexities?
- Biosphere, community, ecosystem, niche
- Community, niche, biosphere, ecosystem
- Niche, community, ecosystem, biosphere
- Ecosystem, biosphere, niche, community
Which of the following types of root modifications is found in radish?
- Fusiform
- Conical
- Napiform
- Tuberous
Which of the following statements is true about a cartilage?
- It is made up of inflexible material called chondrin.
- Its chondrocytes are irregular with off processes.
- Its lacunae give off canaliculli.
- It is a non-vascular tissue with homogeneous matrix.
Which of the following is a matching set of phylum and its three examples?
- Platyhelminthes - Planaria, Schistosoma and Enterobius
- Mollusca - Loligo, Teredo and octopus
- Porifera - Spongilla, Euplectella and Pennatula
- Cnidaria - Bonellia, Physalia and Aurelia
Which of the following is not a symptom of Cushing’s syndrome?
- Obesity
- Hypoglycaemia
- Osteoporosis
- Weakness
- Salt and water retention
Find the mismatched pair:
- Cytokinin : promotes cell division
- Auxin : cell enlargement
- Ethylene : phototropism in shoot
- Abscisic acid : wilting of leaves
The channel running through the midbrain, connecting 3rd and 4th ventricles in humans, is known as
- neural tube
- paracoel
- brain stem
- aqueduct of sylvius
The treatment of snake-bite by antivenine is an example of
- artificially acquired active immunity
- artificially acquired passive immunity
- naturally acquired passive immunity
- specific natural immunity
Algae 'volvox' is considered a colonial form and not a multicellular organism because
- all the cells are arranged in a single layer
- the cells are invested with mucilagenous layer
- the cells are able to communicate with the environment
- all the cells are joined by plasmodesmata with a clear division of labour
Monocot leaves have parallel venation and do not have a distinct midrib. Which of the following monocots is an exception to this rule?
- Phoenix dactylifera
- Musa paradisiaca
- Canna indica
- Strelitzia reginae
Which of the following statements is true about guttation in plants?
- It involves exudation of water through roots.
- It involves exudation of water through stomatal apertures.
- It involves exudation of water and salts through roots and leaf margins.
- It involves exudation of water and salts through hydathodes.
During which of the following periods of the mesozoic era did the toothed birds become extinct?
- Triassic
- Jurassic
- Cretaceous
- None of these
Raju was suffering from severe stomach pain. The doctor diagnosed that he was suffering from peptic ulcer and treated him with antibiotics. He was relieved of the pain. What could be the reason for peptic ulcer?
- Reduced secretion of hormones
- Reduced water content
- Growth of Helicobacter pylori
- Excess secretion of enzymes
The correct sequence of events of embryogenesis in humans is
- fertilisation – zygote – cleavage – morula – blastula – gastrula
- fertilisation – cleavage – morula – zygote – blastula – gastrula
- fertilisation – zygote – blastula – morula – cleavage – gastrula
- cleavage – zygote – fertilisation – morula – blastula – gastrula