Pine cone seeds are produced in the <u>ovules</u> of the <u>female</u> cone.
Pine trees are evergreen coniferous trees with the presence of the characteristic needle like photosynthetic leaves. Pine trees have both the male and female cones on the same tree and are monoecious. The male cones are short lived and fall off after shedding pollen grains. The female cones are long lived and contain the ovules which are fertilized by the pollen to form seeds. Each female cone has spirally arranged scales with two seeds on each scale. On maturity, the cones release the seeds and are dispersed by wind or birds.
Answer:
True
Explanation:
Pulmonary circulation transports blood through the alveoli for gas exchange. In this circulation the blood that comes from the veins initially has low oxygenation, and then leaves the right ventricle of the heart through the pulmonary artery, enters the lungs and returns to the heart with arterial and oxygenated blood
The bronchial circulation is well oxygenated and provides oxygen to the lungs. The structures to which this oxygen contributes in lungs are those that do not participate in a gas exchange.
D) plants absorb water and use the water for photosynthesis
Answer:
When a leaf is placed in a solution whose salt concentration is higher than the salt concentration of the leaves, the water with in the leaves shall move out of the leaves due to the osmotic pressure gradient. This will cause the plant cell devoid of water thereby leading them to shrink and wilt.
Explanation:
Answer:
This voice box occurs in all amphibians but is anatomically most complex in frogs. The larynx exits into the trachea; the latter bifurcates into the bronchi and then into the lungs. The glottis then opens, and elastic recoil of the lungs forces the pulmonary air out and over the new air in the buccopharyngeal pocket.
Explanation:
