Take a look at one of the potted plants and try to find a te

Take a look at one of the potted plants and try to find a terminal bud. Describe or sketch the bud. What will happen to the shape of the plant if you pinch it off? 2. Take a look at a leaf and petiole from one of the plants under the dissecting microscope. Does it have small hairs (trichomes)? 3.Look at the small Coleus spp. plants sitting in water in the flasks. The roots you are observing are adventitious (arising front the stem), and so are not true roots. Do they still have root hairs? 4 Look at a prepared slide of a Coleus spp. shoot tip. Find the apical meristem. Describe the differences in cell size and structure between cells at the apical meristem and cells further down the young stem. 5. Make a cross section of a thin stem from a potted plant and stain it as described in your lab manual. Try and make as thin a section as possible. Look at it under the compound microscope. There are two different types of hairs (trichomes) on the stem of these plants. Sketch the two types, and speculate about their functions. 6. You should see some cells that are stained a darker blue within the stem, not just on the epidermis. What type of cells are these (parenchyma, collenchyma, selerenchyma)? To what tissue system do they belong?

Solution

1Q)

When you pinch back herbs, you are orchestrating two fundamental forces of plant life: the need to reproduce and the need to stay alive long enough to reproduce.

Herbs, like other plants, want nothing more than to reproduce. Most herbs want to make flowers and seeds, so they channel their energy toward stems that will grow fast and bloom quickly. With annual herbs such as basil and marjoram, bud production begins within weeks after plants are set out in the garden. Perennial herbs prepare to bloom in spring soon after days become long and warm.

Whether annual or perennial, herbs’ fast-growing tips send chemical signals down the stem telling secondary buds not to grow. In nature, sprinting to maturity is smart. What we see is a lean, upright plant with few lateral branches. It is totally intent on blooming.

Not what we had in mind! We decide that a bushier plant would be better, plus we want fresh herbs to use for making dinner. We pinch off a few growing tips, taking enough to flavor up the dish we want to make, and in the process we remove the chemical factories that have been inhibiting the growth of the little leaf buds farther down the stems. Within days, new stems pop out just below where we pinched, each one determined to produce flowers as quickly as it can.

2Q) Trichomes are mainly found on leaves and stems, but they can also occur, depending on the species, on petals, petioles, peduncles and seeds. Trichomes can be single-celled or multicellular, but the criterion that is mostly used to classify them is whether they are glandular or not. Non-glandular trichomes are present on most angiosperms, but also on some gymnosperms and bryophytes. On the model plant Arabidopsis, only non-glandular trichomes can be found, which are unicellular and can be either unbranched, or have two to five branches. These trichomes are polyploid and have been extensively studied with respect to their development, e.g., . In contrast, glandular trichomes are usually multicellular, consisting of differentiated basal, stalk and apical cells and can be found on approximately 30% of all vascular plants.

3Q) For this question, more information is needed from your side because, your doubt is reasonable but you are asking about a plant sitting in water in flasks. I think you forget to provide images to some question.Pls provide it so that we can anwer you.