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II. Put the verbs in brackets into the appropriate form and explain the usage of that form in the sentence.

1. The grasses (e.g., corn, rye, and alfalfa) (to have) diffuse roots 2. In the sweet potato some of the larger fibrous roots (to swell) to store food 3. Root systems often far (to exceed) in mass the aboveground portions of the plant. 4. These ramified root systems (to be) important agents in preventing soil erosion.

III. Make the sentences of the exercise II negative. Wordlist

vegetative shoot вегетативний пагон вегетативный побег

floral shoot квітковий пагон, цветковый побег,

квітконіжка цветоножка

stem стебло стебель

node вузол узел

internode міжвузля междоузлие

axillary bud пазухова брунька пазушная почка

apex верхівка, кінчик стебла верхушка, кончик стебля

terminal bud верхівкова брунька верхушечная почка

apical апікальний апикальный

exposure розростання разрастание

reproductive shoot репродуктивний пагон репродуктивный побег

vegetative branch ростовий пагон ростовая ветвь

flattened blade гладка пластина гладкая пластина

petiole черешок черешок

I. Read the text and answer the following questions:

    1. What main parts does the shoot system consist of?

    2. Where is shoot growth usually concentrated?

    3. What is apical domination?

    4. What difference between a reproductive shoot and a vegetative branch?

    5. What do leaves in general consist of?

    6. How is it possible to classify plants?

Shoot system

The shoot system consists of vegetative shoot (stem and attached leaves) and floral shoots terminating in flowers.

STEM

A stem has an alternation of nodes (points where leaves are attached) and internodes (the stem segments between nodes) and an axillary bud (the angle formed by each leaf and the stem). Shoot growth is usually concentrated at the apex of a shoot where there is a terminal bud with developing leaves and a compact series of nodes and internodes. The terminal bud plays a part in apical dominance, inhibiting the growth of axillary buds. Apical dominance is an evolutionary adaptation that increases the plants exposure to light by concentrating resources on growing taller. To increase the exposure of the shoot system to the environment branching becomes important and under certain conditions, axillary buds begin to grow. Each bud has the potential to give rise to either a reproductive shoot (bearing flowers) or a vegetative branch.

LEAVES

Leaves are the main photosynthetic organs of most plants. They vary in form but in general consist of a flattened blade and a petiole (stalk), which joins the leaf to a node of the stem. Vascular arrangement, leaf shape and leaf placement on a stem can help to identify or classify plants.

II. Put a word from the box in the correct place to complete the following sentences.

A petiole, floral shoots, a vegetative branch, to identify or classify plants, an auxiliary bud, apex

  1. Vascular arrangement, leaf shape and leaf placement on a stem can help

  2. Each bud has the potential to give rise to either a reproductive shoot (bearing flowers) or

  3. A stem has an alternation of nodes and internodes and

  4. The shoot system consists of vegetative shoot (stem and attached leaves) and

  5. Shoot growth is usually concentrated at the

  6. They vary in form but in general consist of a flattened blade and