Answer:
Answer is option A.
Orchid bees are to Brazil nut trees as breezes are to pine trees.
Explanation:
In Brazil nut trees, the female orchid bees act as pollinators that help in pollination. In pine trees, wind or breeze helps in pollination.
Pine trees are gymnosperms and so they do not have flowers to attract pollinators like bees or butterflies or birds. They are wind-pollinated. Pine trees are monoecious i.e., both male and female reproductive structures (pine cones) are present on the same tree.
The male cones (catkins) produce pollen grains that are lightweight, less sticky and have air bladders or small wing-like structures. As a result of these features, the pollen grains can be easily carried and dispersed by the breeze. In order to prevent self pollination (pollen falling on the female cones of the same tree), the male cones are normally located on the lower branches of the pine tree.
The female cones are located on the upper branches of the tree and the center of the cone contains eggs or ovules. The pollen grains that are carried by the wind, fall on the female cone of another pine tree. Each pollen grain grows a pollen tube into the center of the cone and the nucleus cell of the pollen travels through the tube and reaches the egg, where it combines with the egg to form an embryo. The embryo eventually grows into a seed. The seeds of pine trees are then dispersed by wind or animals such as squirrels.
Answer:
correct option is a. more realistic
Explanation:
we know that marriage is legally relationship between a husband and a wife
and some for of marriage are
1 Arranged marriage
2 Civil marriage
3 Common law marriage
4 Boston marriage
5 Berdache marriage
and in second marriage
age and experience will be more
so as they age, they have gained experience from their past life
so we can say that in second marriages old couples tend to be more realistic
so correct option is a. more realistic
Answer: Unzipping of DNA refers to the unwinding of DNA duplex from specific site that initiate the replication process (called origin of replication). Replication of DNA requires a single strand template so that DNA polymerase can add nucleotides in order to make new DNA copy.
Therefore, DNA must unzip so that template strand is available for making new DNA.
Answer:
A.
Explanation:
process by which cells use energy from glucose when oxygen is not available
