Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following is not correct?
The general metabolic activity of embryo slows down when it enters into
state of dormancy when not provided with favourable conditions like
oxygen, moisture and suitable temperature.
(page-36)
Which of the following will lose its economic value if fruits are produced through parthenocarpy:
Pomegranate would lose its economic value when produced by
parthenocarpy because parthenocarpy makes fruit seedless and thus
useless.
Which of the following statements is false?
Orchid fruits contain thousands of tiny seeds. Similar is the case in fruits of
some parasitic species such as Orobanche and Striga.
(page-38)
Hybrid seeds have to be produced every year because:
Hybrid seeds have to be produced year after year because if the seed collected from hybrid plant are sown, the plant in the progeny will segregate (Mendel’s law of segregation) and thus do not maintain hybrid characters.
But if these hybrids are made into apomicts, there is no
segregation of characters in the hybrid progeny. Then the farmers can
keep on using the hybrid seeds to raise new crop year after year and there
is no need to buy hybrid seeds every year.
(page-39)
Active research is going on in many laboratories around the world to understand the genetics of apomixis. What is the purpose of such active research?
Because of the importance of apomixis in hybrid seed industry, active
research is going on in many laboratories around the world to understand
the genetics of apomixis and to transfer apomictic genes into hybrid
Varieties.
(page-39)
Both, autogamy and geitonogamy are prevented in:
Autogamy: Pollination within the same flower
Geitonogamy: Pollination within different flowers of the same plant.
Papaya is dioecious as male and female flowers are borne on different
plants, the type of pollination it will undergo is xenogamy or
cross-pollination.
Megasporangium is equivalent to:
Megasporangium is commonly called as ovule, arise from placenta inside ovary.
(page-25)
Pollen tube releases the two male gamete into the:
After entering one of the synergids, the pollen tube releases the two male gametes into the cytoplasm of the synergid. One of the male gametes moves towards the egg cell and fuses with its nucleus thus resulting in the formation of a diploid cell, the zygote. The other male gamete moves towards the two polar nuclei located in the central cell and fuses with them to produce a triploid primary endosperm nucleus (PEN).
(page-34)
One of the Mendel's pure strains of pea plants had green peas. How many different types of eggs could such a plant produce with regard to pea color?
The pure strain is homozygous.
A woman receives her X chromosomes from:
Women have 2 X chromosomes, one comes father and the other from her mother.
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