Biología preguntas y respuestas

Using Key Terms 1. Define the term drug abuse. 2. Identify the term for "the taking of too much of a drug, which causes sickness, loss of consciousness, permanent damage, or even death." Understanding Key Ideas \( \begin{array}{l}\text { 3. Identify which of the following is a type of media } \\ \text { that seems to advocate drug use. } \\ \begin{array}{l}\text { a. music } \\ \text { b. movies } \\ \text { 4. Identify the reasons illegal drugs are danserous. }\end{array} \\ \text { 5. Name five factors that influence a person's choice } \\ \text { to use illegal drugs. }\end{array} \)

15. All mosquito species go through four distinct stages during their life cycle. Tick the odd one out. a) Egg \( \rightarrow \) Larva b) Larva \( > \) Pupa c) Pupa \( \rightarrow \) Adult d) Nymph \( \rightarrow \) Adult

Plne Trees The pine tree is the dominant sporophyte generation (Fig. 18.3) in the life cycle of a pine. Vascular tissue extends from the roots, through the stem, to the leaves. Pine tree leaves are needlelike; leathery; and covered with a waxy, resinous cuticle. The stomata, openings in the leaves for gas exchange, are sunken. The structure of the leaf and the leaf's internal anatomy are adaptive to a drier climate. In pine trees, the pollen sacs and ovules are located in cones. Pollen sacs on pollen cone scales contain microspore mother cells, which undergo meiosis to produce microspores. Microspores ( n ) become sperm-bear- ing male gametophytes (pollen grains). Seed cone scales bear ovules where megaspore mother cells undergo meiosis to produce megaspores. A megaspore ( n ) becomes an egg-bearing female gametophyte. Pollination occurs when pollen grains are windblown from a pollen cone to, ideally, a seed cone on a different plant. After fertilization, the egg becomes a sporophyte ( 2 n ) embryo enclosed within the ovule, which develops a seed coat. The seeds are winged and are dispersed by the wind. 1. Which part of the pine life cycle is an adult sporophyte? 2. Which part of the pine life cycle is the male gametophyte? The female gametophyte? 3. Where does fertilization occur and what structure becomes a seed? Observation: Pine Leaf Obtain a cluster of pine leaves (needles). A very short woody stem is at its base. Each type of pine has a ypical number of leaves in a cluster (Fig. 18.4). How many leaves are in the cluster you are examining? What is the common name of your specimen?

a. Regulates the fovement of materials into and out of the cell b. Contains extra genes, such as those for antibiotic resistance, and can be transferred from cell to cell c. Main site of genetic information in the cell d. Provides structural support and protection e. Enables cell to adhere to surfaces, protects it from dehydration, and shields it from attack by the host's immune system f. Facilitates the transfer or plasmids from one cell to another g. Short appendages, used for attachment to surfaces h. The site of many chemical reactions, gel-like i. May be made of nutrients or clumps of magnetite (iron oxide) j. Allows for movement of bacterial cells k. An infolding of the plasma membrane, where specific chemical reactions may be localized

True or False: Evidence from the fossil record shows that species change grodually over time.

3. ЖитС ауруымен ауыратын адамның иммунитетінің жойылу себептерін атаңдар. 4. Жасушалық және гуморальдық иммунитетті жүзеге асыратын лейкоциттердің рөлін салыстырындар. Талдау: 1. Ағзаның иммундық жауап беру кезендерінің қалыптасуын талдандар.

250,000 years ago the first humans had similar physical appearances. They were tall, they had dark skin, their hair was curly and black, and their eyes were brown. Today we have different coloured skin and eyes, and all types of hair. Why do some of us look very different from our ancestors? Why were there changes in our appearance? East Africa was the home of the first humans. It had a very hot and sunny climate. Dark skin, brown eyes and curly black hair were essential in the strong African sun. But 70,000 to 80,000 years ago there were migrations from Africa to other parts of the world. The climates in these new locations weren't the same. Was that important? Yes, it was. In Northern Europe, for example, in the long winters it was cold, the days weren't very long and there wasn't much sunshine. Fair skin was necessary to produce Vitamin D. In Asia people had different eye shapes to protect them from cold weather or strong UV light in snowy regions. The changes in our physical appearance were important for our survival in our new homes. And that's the reason we all look different.

3.7. Mention TWO importance of oxygen in the soil. 8. Soil colloids are verv minute fing

2. Many modern whales have a vestigial pelvis and femur, such as is shown in the diagram. What does this evidence suggest about ancestors of modern whales?

Short Answer Questions: 1. Describe the 4 steps (in order) in the speciation process or Draw and explain using speciation process for beetles.