Assertion: Coconut tree is distributed in coastal areas over a large part of the world.
Reason: Coconut fruit can float and gel dispersed over thousands of kilometers before losing viability.
If both Assertion and Reason are true and Reason is the correct explanation of Assertion
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
If Assertion is true but Reason is false
If both Assertion and Reason are false.
A.
If both Assertion and Reason are true and Reason is the correct explanation of Assertion
Coconut requires the hot and wet climate hence it is grown in coastal areas. It is widely grown in coastal and deltic regions of tropical and subtropical countries. Coconut fruit shows hydrochory i.e. the dispersal takes place through water medium. Being the inhabitant of coastal area the fruit is so adapted that it can float and get dispersed over thousands of kilometers before losing viability.
Double fertilization involves
fertilization of the egg by two male gametes
fertilization of two eggs in the same embryo sac by two sperms brought by one pollen tube
fertilization of the egg and the central cell by two sperms brought by different pollen tubes
fertilization of the egg and the central cell by two sperms brought by the same pollen tube.
Pollen grains are able to withstand extremes of temperature and dessication because their exine is composed of
cutin
suberin
sporopollenin
callose
Assertion: Insects visit flowers to gather honey.
Reason: Attraction of flowers prevents the insects from damaging other parts of the plant.
If both Assertion and Reason are true and Reason is the correct explanation of Assertion
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
If Assertion is true but Reason is false
If both Assertion and Reason are false.
Assertion : Vegetable oils are fats which are present in plant cells in soluble form.
Reason : Vegetable oils occur only in cells of embryo.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Plants of which one of the following groups of genera arc pollinated by the same agency
Triticum, Cocos, Mangifera
Ficus, Kigelia, Casuarina
Salvia, Morus, Euphorbia
Bombax, Butea, Bauhinia
In which one of the following would you expect to find glyoxysomes?
Endosperm of wheat
Endosperm of castor
Palisade cells in leaf
Root hairs
The pollen tube usually enters the embryo sac
through one of the synergids
by directly penetrating the egg
between one synergid and central cell
by knocking off the antipodal cells.
When the pollen tube enters through the micropyle, it is termed as
chalazogamy
mesogamy
porogamy
none of these
