bio topic 9 Flashcards
(23 cards)
What is a benefit of having xylem vessels close to phloem sieve tubes in plants?
Water can be supplied more easily to the phloem.
Which adaptation would allow plants to live in saline irrigated soil?
Active uptake and compartmentalization of mineral ions to maintain homeostasis
Excessive irrigation can cause increased salinity in the soil. What effect does this have on water transport in the plant roots?
Decreases movement of water from soil into the root
What is a function of xylem?
Mechanical support and transport of water
What is a role of xylem?
It contributes to the plant support with lignified walls.
Where does the transport of sucrose occur?
In the phloem
What could be used in a technique for measuring flow rates in phloem?
Aphid stylets and 14C02
How does auxin exert its effect on plant cells?
Binds to a receptor resulting in expression of genes
How does auxin contribute to phototropism?
It increases growth of cells on the shaded side of the stem.
What is an aspect of indeterminate growth in plants?
The shoot apex retains undifferentiated cells that can divide repeatedly to produce new leaves.
What is/are the effect(s) of auxin in plants?
Increasing the rate of cell elongation in stems and detecting the direction of light
What is a meristem?
A plant tissue consisting of actively dividing, undifferentiated cells that can divide, multiply, and differentiate to form different tissues and organs of a plant
A man attaches a bird box to the trunk of a dicotyledonous tree. A few years later he returns to the tree and finds that his bird box is still attached and the tree is much taller. How high will his bird box be from the ground?
Unchanged as growth from the apical meristem would be above the box.
What is always needed for seed germination?
Oxygen
Plants were given four different light treatments to investigate the influence of light on flowering. Which method can be used to induce a short-day plant to flower?
8 hours light, 16 hours dark
Which method can be used to induce short-day plants to flower out of season?
Cover them with opaque cloth for several hours before sunset
Students investigated the environmental factors needed for germination, using seeds from 20 different plant species. Which factors would prevent germination if they are absent?
Suitable temperature and oxygen
What is a difference between pollination and fertilization in flowering plants?
Pollination is movement of pollen from anther to stigma whereas fertilization depends on the growth of a pollen tube from the stigma to the ovule.
Micropropagation is used to produce large numbers of plants in a short period of time. What is a feature of micropropagation?
The process is sterile and resulting plants are disease-free.
If seeds of an unknown species of plant are discovered, what assumption can be made about the species?
Its male gametes are contained within pollen.
Which statement describes the control of reproduction in flowering plants?
Flowering in short-day plants results from changes in gene expression in the shoot apex.
Which process happens first during germination of a starchy seed?
Absorption of water
What steps occur in germination after water uptake?
Gibberellin is produced, followed by amylase activation
