In placental mammals the females show cyclic changes in the activities of ovaries, accessory ducts and hormones throughout their reproductive phase. Such cyclic changes in primates are called menstrual cycle whereas in non-primates oestrous cycle.
BIOXII01: REPRODUCTION IN ORGANISMS
341428
Offspring formed by sexual reproduction exhibit more variation than those formed by Asexual reproduction because:
1 Sexual reproduction is a lengthy process
2 Gametes of parents have qualitatively different genetic composition
3 Genetic material comes from parents of two different species
4 Greater amount of DNA is involved in sexual reproduction.
Explanation:
Fertilization during sexual reproduction results in gene pools from two different individuals and thus zygote has a somewhat different genotype than both the parents and show more variation.
NCERT Exemplar
BIOXII01: REPRODUCTION IN ORGANISMS
341429
Which of the following organisms breeds only once in life time ?
1 Bamboo
2 Oysters
3 Pelagic fishes
4 Birds
Explanation:
Bamboo species flower only once in their life time and that too nearly after 50-100 years of vegetative growth. Once they flower, they produce large number of fruits and die.
BIOXII01: REPRODUCTION IN ORGANISMS
341430
In both plants and animals, the factors responsible for the transitions between the three phases.
1 Hormones
2 Interaction between hormones and certain environmental factors regulate the reproductive processes
3 The associated behavioral expressions of organisms.
4 All of these
Explanation:
In both plants and animals, hormones are responsible for the transitions between the three phases. Interaction between hormones and certain environmental factors regulate the reproductive processes and the associated behavioural expressions of organisms.
In placental mammals the females show cyclic changes in the activities of ovaries, accessory ducts and hormones throughout their reproductive phase. Such cyclic changes in primates are called menstrual cycle whereas in non-primates oestrous cycle.
BIOXII01: REPRODUCTION IN ORGANISMS
341428
Offspring formed by sexual reproduction exhibit more variation than those formed by Asexual reproduction because:
1 Sexual reproduction is a lengthy process
2 Gametes of parents have qualitatively different genetic composition
3 Genetic material comes from parents of two different species
4 Greater amount of DNA is involved in sexual reproduction.
Explanation:
Fertilization during sexual reproduction results in gene pools from two different individuals and thus zygote has a somewhat different genotype than both the parents and show more variation.
NCERT Exemplar
BIOXII01: REPRODUCTION IN ORGANISMS
341429
Which of the following organisms breeds only once in life time ?
1 Bamboo
2 Oysters
3 Pelagic fishes
4 Birds
Explanation:
Bamboo species flower only once in their life time and that too nearly after 50-100 years of vegetative growth. Once they flower, they produce large number of fruits and die.
BIOXII01: REPRODUCTION IN ORGANISMS
341430
In both plants and animals, the factors responsible for the transitions between the three phases.
1 Hormones
2 Interaction between hormones and certain environmental factors regulate the reproductive processes
3 The associated behavioral expressions of organisms.
4 All of these
Explanation:
In both plants and animals, hormones are responsible for the transitions between the three phases. Interaction between hormones and certain environmental factors regulate the reproductive processes and the associated behavioural expressions of organisms.
In placental mammals the females show cyclic changes in the activities of ovaries, accessory ducts and hormones throughout their reproductive phase. Such cyclic changes in primates are called menstrual cycle whereas in non-primates oestrous cycle.
BIOXII01: REPRODUCTION IN ORGANISMS
341428
Offspring formed by sexual reproduction exhibit more variation than those formed by Asexual reproduction because:
1 Sexual reproduction is a lengthy process
2 Gametes of parents have qualitatively different genetic composition
3 Genetic material comes from parents of two different species
4 Greater amount of DNA is involved in sexual reproduction.
Explanation:
Fertilization during sexual reproduction results in gene pools from two different individuals and thus zygote has a somewhat different genotype than both the parents and show more variation.
NCERT Exemplar
BIOXII01: REPRODUCTION IN ORGANISMS
341429
Which of the following organisms breeds only once in life time ?
1 Bamboo
2 Oysters
3 Pelagic fishes
4 Birds
Explanation:
Bamboo species flower only once in their life time and that too nearly after 50-100 years of vegetative growth. Once they flower, they produce large number of fruits and die.
BIOXII01: REPRODUCTION IN ORGANISMS
341430
In both plants and animals, the factors responsible for the transitions between the three phases.
1 Hormones
2 Interaction between hormones and certain environmental factors regulate the reproductive processes
3 The associated behavioral expressions of organisms.
4 All of these
Explanation:
In both plants and animals, hormones are responsible for the transitions between the three phases. Interaction between hormones and certain environmental factors regulate the reproductive processes and the associated behavioural expressions of organisms.
In placental mammals the females show cyclic changes in the activities of ovaries, accessory ducts and hormones throughout their reproductive phase. Such cyclic changes in primates are called menstrual cycle whereas in non-primates oestrous cycle.
BIOXII01: REPRODUCTION IN ORGANISMS
341428
Offspring formed by sexual reproduction exhibit more variation than those formed by Asexual reproduction because:
1 Sexual reproduction is a lengthy process
2 Gametes of parents have qualitatively different genetic composition
3 Genetic material comes from parents of two different species
4 Greater amount of DNA is involved in sexual reproduction.
Explanation:
Fertilization during sexual reproduction results in gene pools from two different individuals and thus zygote has a somewhat different genotype than both the parents and show more variation.
NCERT Exemplar
BIOXII01: REPRODUCTION IN ORGANISMS
341429
Which of the following organisms breeds only once in life time ?
1 Bamboo
2 Oysters
3 Pelagic fishes
4 Birds
Explanation:
Bamboo species flower only once in their life time and that too nearly after 50-100 years of vegetative growth. Once they flower, they produce large number of fruits and die.
BIOXII01: REPRODUCTION IN ORGANISMS
341430
In both plants and animals, the factors responsible for the transitions between the three phases.
1 Hormones
2 Interaction between hormones and certain environmental factors regulate the reproductive processes
3 The associated behavioral expressions of organisms.
4 All of these
Explanation:
In both plants and animals, hormones are responsible for the transitions between the three phases. Interaction between hormones and certain environmental factors regulate the reproductive processes and the associated behavioural expressions of organisms.
