Which of the following birth control measures can be considered as the safest?
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Solution
Sterilization techniques can be considered as the safest birth control measures. It provides a permanent and sure birth control. It is called vasectomy in male and tubectomy in female.
Christmas disease is another name for
Which one of the following pairs is correctly matched ?
Identify the correctly matched pair/pairs of the germ layers and their derivatives –
| (1)Ectoderm— | Epidermis |
| (2)Endoderm— | Dermis |
| (3)Mesoderm— | Muscles |
| (4)Mesoderm— | Notochord |
| (5)Endoderm— | Enamel of teeth |
Which of the following structures in Pinus are haploid?
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Solution
Because endosperm is haploid (n) and formed before fertilization and megaspore mother cell divides reductionally to form a linear tetrad of haploid reductionally to form a linear tetrad of haploid megasporesand microspore (= pollen grain) is the first stage of the gametophyte (n).
Systematics deals with –
Recombinant nodules are found during
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Solution
Knot like structure 'Chromomeres' found in the stage leptotene of prophase first of meiosis.
Which endangered animal is the source of world’s finest, lightest, warmest and most expensive wool-the shahtoosh ?
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Solution
Chiru is Himalayan Ibex, also called Tibetan Antelope. Shahtoosh is obtained from its neck hair. It is banned under the law.
Evolutionary classification is called –
The energy required during transmission of impulse is provided by –
In the choices below, which is not a correct pairing of a macronutrient and the major functions it performs in the life of a plant?
Most enzymes consist of two parts; these are
Cross-pollination is preferred over self-pollination because
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Solution
Crossing leads to hybrid vigour or superiority.
A common test to find the genotype of a hybrid is by
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Solution
In Drosophila, the sex is determined by
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Solution
Calvin Bridges demonstrated that in Drosophila, the sex is determined by ratio of the number of X chromosomes to the sets of autosomes.
Estrogen and testosterone are steroid hormones, and are most likely bind to
The diagram below shows undisturbed sedimentary strata at the bottom of an ocean. The fossils found in layer B resemble the fossils found in layer A. This similarity suggests that
What distinguishes an insect from a crustacean ?
Number of bones in hind limb of human is-
Which one of the following is the correct matching of the events occurring during menstrual cycle?
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Solution
The corpus luteum is essential for establishing and maintaining pregnancy in females. In the ovary, the corpus luteum secretes estrogens and progesterone, which are steroid hormones responsible for the thickening of the endometrium and its development and maintenance,respectively.