Q. No.Many adaptations of an organism have evolved over a long duration of evolution and are______
(1) Genetically unstable.
(2) Genetically fixed.
(3) Genetically disadvantageous.
(4) Genetically extemporaneous.
(1) Genetically unstable.
(2) Genetically fixed.
(3) Genetically disadvantageous.
(4) Genetically extemporaneous.
The main reason behind building burrows in soil by burrowing animals is
(1) To escape from predators.
(2) To derive nutrition parts of plants from Underground.
(3) The mode of evolution chose burrows as a specific habitat.
(4) To hide and escape from the above ground heat.
Choose the odd one out with respect to structure formed in the different organisms during suspended phase.
(1) Bacteria - Thick-walled spores
(2) Higher plants - Seeds, vegetative propagules
(3) Zooplankton - Diapause state
(4) Ectothermic organism - Torpid state during favourable season.
Smaller animals tend to lose body heat very fast as compared to larger animals because they have
(1) Higher surface to volume ratio.
(2) Lower surface to volume ratio.
(3) Equal values of surface and volume.
(4) Very low BMR (basal metabolic rate).
Select the incorrect statement
(1) Organisms living in oceans, lakes and rivers do not face any water related problems.
(2) Productivity and distribution of plants is dependent on water.
(3) The levels of thermal tolerance of different species determine to a large extent their geographical distribution
(4) Foraging, reproductive and migratory activities of some animals are dependent on seasonal variations in light
Population size in any given habitat is also known as _______
(1) Population cluster
(2) Population explosion
(3) Population abundance
(4) Population density
The population with the following age pyramid:
1. Will grow exponentially in near future
2. Will grow steadily in the future
3. Is likely to remain stable in future
4. Is likely to decline in future
Mycorrhizal hyphae helps in:
1. absorbing minerals and ions
2. maintaining cell shape
3. increasing cellular respiration
4. anchoring a plant
Earliest vascular plants on land acquired water and mineral nutrients most likely by:
1. absorption by trichomes.
2. diffusion through stomata.
3. the help of symbiotic mycorrhizae.
4. osmosis through the root hairs.
Epiphytes:
1. are aerial vines common in tropical regions
2. are parasitic and use haustoria
3. live in oligotrophic soil and digest insects to obtain nitrogen
4. grow on other plants but do not obtain nutrients from their hosts
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