Question

answer these questions please ​

Answer 1

Question 1

              The leaves of the desert plants are reduced to spines to help to prevent the loss of water by transpiration. ... Since in deserts, there is a scarcity of water, if the plants lose more water, they will not survive. Hence to prevent this such adaptations have been developed.

Question 2

            a)a flattened stem or branch having the function of a leaf.A phyllode is a modified petiole or a shoot that connects the stem with leaf; its function resembles that of ​​a leaf. A phylloclade, by contrast, is a modified stem, that is responsible for photosynthesis. Melanoxylone is an example of a plant with phyllodes while cactus and cocoloba have phylloclades.

           b)When the veins are arranged in either web-like or network-like all over the lamina, it is known as reticulate venation. When the veins are arranged parallel to one another all over the lamina, it is known as parallel venation.

Question 3

           Each leaf typically has a leaf blade ( lamina ), stipules, a midrib, and a margin. Some leaves have a petiole, which attaches the leaf to the stem; leaves that do not have petioles are directly attached to the plant stem and are called sessile leaves

Question 4

           A simple leaf blade is undivided as shown on the left (though the margins may be toothed or even lobed). The blade of a compound leaf is divided into several leaflets as shown on the right. ... Each leaf, whether simple or compound, has a bud at its base (on the twig). There are no buds at the base of each leaflet.

Question 5

            As one of the most important constituents of plants, leaves have several essential functions:

Photosynthesis.

Transpiration.

Guttation.

Storage.

Defense.

Conifer Leaf.

Microphyll Leaf.

Megaphyll Leaf

Question 7

           Pollination: Is defined as the deposition of pollen grains on the stigma of a flower from anthers belonging to the same flower, same plant or a different plant.

Pollination is of two types  

Self pollination - Stigma receiving pollen grains from the same flower  

Cross pollination - Stigma receiving pollen grains from a flower on the same plant or a different plant

Wind and insects are two agents of pollination, called as Anemoplily and Entomophily respectively

Example of wind pollination - Grasses, Gymnosperms etc

Example of insect pollination - Rose, Euphorbia sps etc

Pollination and fertilization - Suitable pollination leads to compatible pollen grains being deposited on the stigma, leading to pollen tube development and fertilization.

Question 8

           A typical flower has four main parts—or whorls—known as the calyx, corolla, androecium, and gynoecium (Figure 1). The outermost whorl of the flower has green, leafy structures known as sepals. The sepals, collectively called the calyx, help to protect the unopened bud.

Question 9

           In general, plants absorb nitrogen and phosphorus from the soil through their roots. Insectivorous plants, however, absorb nitrogen and phosphorus from their animal prey through their leaves specially modified as traps.

Question 10

Wind pollinated flowers:

• The pollinating agent is wind.

•    These flowers are unisexual, dull coloured, and without scent and nectar.
• Pollen grains are small, light, and produced in large number so a lot of wastage occur.
• Stigma is feathery or sticky and hangs out of petals. Stamens are long and visible out of petals.

Insect pollinated flower :

• The pollinating agents are insect.
• These flowers are brightly coloured, scented and produce a lot of nectar.
• Pollen grains are large, sticky, spiny and are produced in small numbers so no wastage occur.
• Stigma is small and is situated deep inside the petals.Stamens may be small and hidden inside petals.

      plzzzzzzzzzzzzzzzzzzzzzz mark as brainliest