NEET Practice Questions (MCQs) with Answers & Solutions

If the female parent bears bisexual flowers, removal of anthers from the flower bud before the anther dehisces is done using a pair of

forceps-emasculation.

Emasculated flowers have to be covered with a bag of suitable size,

generally made up of butter paper, to prevent contamination of its stigma

with unwanted pollen. This process is called bagging.

When the stigma of bagged flower attains receptivity, mature pollen grains

collected from anthers of the male parent (cross pollination) are dusted on

the stigma, and the flowers are rebagged.

(page-33)

It is the outermost layer of endosperm of wheat and other grains. It is a

single layer of cells that synthesizes enzyme alpha-amylase during

germination into endosperm which breaks down starch into maltose and

glucose.

If favourable conditions like- adequate moisture, oxygen and suitable

Temperature, a seed germinates. But it may enter a state of inactivity

called dormancy when not provided with favourable conditions.

(page-36)

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)

Pomegranate would lose its economic value when produced  by

parthenocarpy because parthenocarpy makes fruit seedless and thus

useless.

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 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)

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)

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 commonly called as ovule, arise from placenta inside ovary.

(page-25)