MCQ
The species listed in Red Data Book are
- AThreatened
- BEndangered
- CRare
- ✓All of these
✓
Answer
Correct option: D.
All of these
d
Those species whose population has been greatly reduced or whose natural habitats have been disturbed due to which these are near the extinction and may become extinct if the causative factors continue, are grouped under the category of threatened species.
Those species whose population has been greatly reduced or whose natural habitats have been disturbed due to which these are near the extinction and may become extinct if the causative factors continue, are grouped under the category of threatened species.
$IUCN$ (International Union Conservation of Nature and Natural Resources) is maintaining a Red Data Book, which contains a record of species, which are threatened. These include vulnerable, endangered and rare species
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Read the following and choose the option with all incorrect statements.
(i) In the hypogynous flower the gynoecium occupies the highest position while the other parts are situated below it
(ii) In epigynous flowers, the margin of thalamus grows upwards enclosing the ovary partially and getting fused with it, the other parts of flower arise above the ovary.
(iii) In hypogynous flower ovary is said to be superior.
(iv) In plum, rose and peach; flower is epigynous and ovary is said to be inferior
(v) The mode of arrangement of sepals or petals in floral bud with respect to the other members of the same whorl is known as aestivation.
(vi) When sepals or petals in a whorl just touch one another at the margin, without overlapping as in Calotropis, it is said to be valvate.
(vii) If the margins of sepals or petals overlap one another but not in any particular direction as in Cassia and gulmohur, the aestivation is called imbricate.
(viii) A fertile stamen is called staminode.
(ix) When stamens are attached to the petals, they are epipetalous as in lilly, or epiphyllous when attached to the perianth as in the flowers of brinjal.
(x) The stamens may be united into one bunch or one bundle called monoadelphous as in china rose.
(xi) A carpel consists of three parts namely stigma, style and ovary.
(xii) The stigma is usually at the tip of the Style and is the receptive surface for pollen grains.
(xiii) Each ovary bears one or more ovules attached to a flattened, cushion-like placenta.
(xiv) When more than one carpel is present, they may be free and are called syncarpous.
(xv) After fertilization, the ovules develop into seeds and the ovary matures into a fruit.
(i) In the hypogynous flower the gynoecium occupies the highest position while the other parts are situated below it
(ii) In epigynous flowers, the margin of thalamus grows upwards enclosing the ovary partially and getting fused with it, the other parts of flower arise above the ovary.
(iii) In hypogynous flower ovary is said to be superior.
(iv) In plum, rose and peach; flower is epigynous and ovary is said to be inferior
(v) The mode of arrangement of sepals or petals in floral bud with respect to the other members of the same whorl is known as aestivation.
(vi) When sepals or petals in a whorl just touch one another at the margin, without overlapping as in Calotropis, it is said to be valvate.
(vii) If the margins of sepals or petals overlap one another but not in any particular direction as in Cassia and gulmohur, the aestivation is called imbricate.
(viii) A fertile stamen is called staminode.
(ix) When stamens are attached to the petals, they are epipetalous as in lilly, or epiphyllous when attached to the perianth as in the flowers of brinjal.
(x) The stamens may be united into one bunch or one bundle called monoadelphous as in china rose.
(xi) A carpel consists of three parts namely stigma, style and ovary.
(xii) The stigma is usually at the tip of the Style and is the receptive surface for pollen grains.
(xiii) Each ovary bears one or more ovules attached to a flattened, cushion-like placenta.
(xiv) When more than one carpel is present, they may be free and are called syncarpous.
(xv) After fertilization, the ovules develop into seeds and the ovary matures into a fruit.
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Reason: In meiosis-I chromosome numbers become half in compare to parental cell while in meiosis-II no change in chromosome number.
Reason: In meiosis-I chromosome numbers become half in compare to parental cell while in meiosis-II no change in chromosome number.
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