Which one of the following statements is correct?
Options
(a) sporogenous tissue is haploid (b) Endothecium produces the microspores (c) Tapetum nourishes the developing pollen (d) Hard outer layer of pollen is called […]
Artificial insemination mean :
Options
(a) Transfer of sperms of husband to a test tube containing ova (b) Artificial introduction of sperms of a healthy donor into the vagina (c) Introduction of sperms […]
One of the legal methods of birth control is :
Options
(a) by abstaining from coitus from day 10 to 17 of the menstrual cycle (b) by having coitus at the time of […]
Select the wrong statement about reproduction
Options
(a) Anisogametes differ either in structure, function or behaviour (b) In Oomycetes female gamete is smaller and motile, while male gemete is larger non-motile (c) Chalmydomonas exhibits […]
Monoecious plant of Chara shows occurrence of :
Options
(a) stamen and carpel of the same plant (b) upper antheridium and lower oogonium on the same plant (c) upper oogonium and lower antheridium […]
Benthic organisms are affected most by
Options
(a) Water-holding capacity of soil (b) Light reaching the forest floor (c) Surface turbulence of water (d) Sediment characteristics of aquatic ecosystems
Correct Answer:
Sediment characteristics […]
The age pyramid with broad base indicates
Options
(a) High percentage of young individuals (b) High percentage of old individuals (c) Low percentage of young individuals (d) A stable population
Correct Answer:
High […]
A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is :
Options […]
During sewage treatment, biogases are produced which include :
Options
(a) methane, oxygen, hydrogen sulphide (b) hydrogen sulphide, methane, sulphur dioxide (c) hydrogen sulphide, nitrogen, methane (d) methane, hydrogen sulphide, carbon dioxide
Correct […]
The H-zone in the skeletal muscle fibre is due to :
Options
(a) The central gap between myosin filaments in the A-band (b) The central gap between actin filaments extending through myosin filaments in […]
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