Selaginella and Salvinia are considered to represent a significant step toward evolution of seed habit because:
Options
(a) female gametophyte is free and gets dispersed like seeds (b) female gametophyte lacks archaegonia (c) […]
Which one of the following aspects is an exclusive characteristic of living things ?
Options
(a) Isolated metabolic reactions occur in vitro (b) Increase in mass from inside only (c) Perception of events […]
Algae have cell wall made up of
Options
(a) cellulose,galactans and mannas (b) hemicellulose,pectins and proteins (c) pectins, cellulose and proteins (d) cellulise,hemicellulose and pectins
Correct Answer:
cellulose,galactans and mannas
Explanation:
Algae possess a […]
Some hyperthermophilic organisms that grow in highly acidic (pH2) habitats belong to the two groups:
Options
(a) Eubacteria and archaea (b) Cyanobacteria and diatoms (c) Protists and mosses (d) Liverworts and yeasts
Correct Answer: […]
Heartwood differs from sapwood in:
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(a) presence of rays and fibres (b) absence of vessels and parenchyma (c) having dead and non -conducting elements (d) being susceptible to pests and pathogens
Correct […]
Which one of the following statements about certain given animals is correct?
Options
(a) Round worms (Aschelminthes) are pseudocoelomates (b) Molluscs are acoelomates (c) Insects are pseudocoelomates (d) Flat worms (Platyhelminthes) are coelomates
Which one of the following statements about all the four of Spongilla, Leech, Dolphin and Penguin is correct?
Options
(a) Penguin is homeothermic while the remaining three are poikilothermic (b) Leech is a […]
Which one of the following is correct pairing of a body part and the kind of muscle tissue that moves it ?
Options
(a) Biceps of upper arm–Smooth muscle fibres (b) Abdominal wall–Smooth muscle […]
Which one of the following correctly describes the location of some body parts in the earthworm Pheretima ?
Options
(a) Four pairs of spermathecae in 4 – 7 segments (b) One pair of ovaries […]
Select one of the following pairs of important features distinguishing Gnetum from Cycas and Pinus and showing affinities with angiosperms
Options
(a) absence of resin duct and leaf venation (b) presence of vessel elements […]
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