الخصائص العامة للنباتات

1 answer:

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النّباتات كائنات حيّة تنتشر في جميع أنحاء العالم، وهي تعيش على اليابسة أو في المسطحات المائيّة، وتضم مملكة النّباتات أكثر من 350,000 نوع من الأشجار، والشّجيرات، والأعشاب، والسّراخس.[١] تنتج النّباتات غذاءها بنفسها عن طريق عملية البناء الضّوئي، وهي عملية تحدث داخل البلاستيدات الخضراء التي تحتوي على مادة الكلوروفيل التي تحوّل الطّاقة الشّمسيّة وغاز ثاني أكسيد الكربون إلى غذاء.7

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What is the main reason scientist do experiments?

vladimir1956 [14]

A. to find out if a hypothesis is correct.

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Whales and hippos share what 3 characteristics? source is https://youtu.be/lIEoO5KdPvg

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Answer: Hairlessness and Glands
explanation:Another notable similarity between the two groups is minimal hair. Both hippos and whales possess barely any hair on their bodies. They do not have sweat glands, either. These are both characteristics that can assist them in their aquatic lifestyles.

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Question 2 (1 point) Question 2 Unsaved

Charra [1.4K]

Q2. The answer is C. Gymnosperms.

The word 'Gymnosperms' is derived from two greek words: 'gymnos' = naked and 'sperm' = seed. Literally, their seeds are naked, i.e. they do not form inside an additional structure. Their seeds develop on the surface of scales modified to form cones. This group of plants include pine trees, cycads, and cedar trees.

Q3. The answer is A. Angiosperms.

Angiosperms or flowering plants are seed-producing plants, just like Gymnosperms. Their seeds form inside additional structures known as fruits. This group is the most diverse group of plants and include nearly 300,000 species. Angiosperms include grasses, roses, maple trees, and many other plants with flowers.

Q4. The answer is B. Lichen.

Lichen consists of hyphae (just like other fungi) that surround cells of green algae or other photosynthetic organisms. This partnership between fungi and algae is known as mutualistic symbiosis. As in any other mutualistic symbiosis, both partners have benefits: fungi gain nutrients from algae and algae gain protection from fungi.


Q5. The answer is C. Vertebrate.

Vertebrates are organisms with an interior skeleton, or endoskeleton, and a backbone. Unlike vertebrates, invertebrates do not have a backbone or interior skeleton. The basic body plan of vertebrates includes vertebral column and/or notochord, the gastrointestinal tract below the notochord and the spinal cord above the notochord. Vertebrates include fish, amphibians, reptiles, birds, and mammals.


Q6. The answer is B. Invertebrate.

Invertebrates are organisms without an internal skeleton and backbone. The main difference between vertebrates and invertebrates is that vertebrates have backbone and internal skeleton and invertebrates lack in those structures. Invertebrates include all animals that are not vertebrates and include about 97% of all animals. Some of them are insects, sea anemones, and worms.

Q7. The answer is A. Bilateral Symmetry.

Bilateral symmetry is symmetry around a single line. That means that only one plane divides an organism into two matching halves, left and right. Thus, this type of symmetry is also known as left-right symmetry. Word 'bilateral' comes from two Latin words: 'bi-' means 'two' and 'latero' means 'side', literally 'bilateral' = 'two sides'. Human beings are the example of organisms with bilateral symmetry.

Q8. The answer is C. Asymmetry

Asymmetry means without symmetry. The word 'asymmetry' is derived from two Greek words: 'a-' = 'not' and 'symmetros' = symmetry, commensurable. Not all animals are symmetric. There are some species that show asymmetry, such as some sponges and flatfish.

Q9. The answer is B. Radial Symmetry.

A symmetry around any point is radial symmetry. The body of radially symmetric organisms can be divided into equal parts about a central point and they have no left or right side of the body. This type of symmetry is characteristic for sea stars, sea cucumbers, sea anemone, jellyfish, corals.

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3 years ago

Plants that are more similar to algae are _____.

nordsb [41]

The answer is nonvascular plants.

The plants that are similar to algae are called nonvascular plants. They are the plants small plants with the absence of vascular system. They do not have roots. They have small hair likes that insert to substrate to keep the plants in place instead of roots. These are called rhizoids.

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What ways do enzymatic catalysts increase the rates of reactions? they shift the reaction equilibrium toward the products they d

Elodia [21]

This is a question regarding how enzymes increase the rates of reactions. There are choices and the instructions is to check all that apply.

1. They shift the reaction equilibrium towards the products. 
2. They increase the concentration of the reactants. 
3. They lower the activation energy of the reaction. 
4. They decrease the free energy of a reaction. 
5. They promote the formation of a transition state.

The correct answers in this question are "they lower the activation energy of the reaction" and "they promote the formation of a transition state". Enzymes do not necessarily shift the the reaction equilibrium to the products, as there are reversible enzymatic reactions that can reverse the pathway back to the substrates. They do not increase the concentration of the reactants as the concentration of the reactants is an independent variable in this process. They do not decrease the free energy of activation as this is a constant in every reaction depending on the substrates and the products.

Enzymes do, however, lower the activation energy of the reaction meaning it will take less energy and effort for the substrates to reach the activation energy to transform it to its transition state then to the products. With this said, enzymes promote the formation of a transition state.

Attached is a simplified image on how enzymes work.

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3 years ago

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