C. To protect the embryo inside. D. To help the seed float in the air. 相关知识点: 试题来源: 解析 C。解析:种子的种皮的作用是保护内部的胚。选项A,胚乳是为发育中的胚提供食物的,不是种皮,A错误。选项B,种皮不能直接参与光合作用,B错误。选项D,种皮没有帮助种子在空中漂浮的作用,D错误。
ICSEC - Grade 09 - Biology - Seed Structure And Germination - Q9
The plant embryo, sometimes called the seed embryo, is the part of a seed or bud that contains the earliest forms of a plant's roots, stem and leaves. The embryo develops after a fertilized adult plant flowers, and is generally contained within a seed or bud. It acts as a sort of "...
This is because the embryo inside the seed is dehydrated, and cells need water for active metabolism. Water is the substance in which most of the chemical reactions of the plant take place.For a seed to sprout and grow, it needs a great deal of energy. Seeds get this energy by ...
“He goes as long-awaited plans to create a new hub for Swindon are still at theembryostage.” Noun ▲ An unborn or unhatched vertebrate showing signs of the mature animal “The most common mutant phenotype was anembryowith a polar body near one end and the development of one or two spi...
The formation of the seed is part of the process of reproduction in seed plants, the spermatophytes, including the gymnosperm and angiosperm plants. Cede Give up (power or territory) In 1874, the islands were ceded to Britain Seed A mature plant ovule containing an embryo. Cede To surrender...
Apomixis in flowering plants is defined asthe asexual formation of a seed from the maternal tissues of the ovule, avoiding the processes of meiosis and fertilization, leading to embryo development. What is apomictic embryo? Apomixis:Embryo Sacs and Embryos Formed without Meiosis or Fertilization in ...
Which structures of the reproductive system produce haploid sex cells? What is the site of zygote formation in the ovule of a flowering plant? What are the reproductive parts of cone-bearing plants? What is the seeds reproductive system consist of, what sex? Into what does the embryo develop...
If you can’t see the above video, use this link:https://youtu.be/dhL57pqnHHQ Immature Embryo In many cases collected seed is not fully developed. It looks ripe, and all external characteristics say it is fully developed, but internally the embryo is not fully grown. In this case the...
What is an embryo? What is a Monocotyledon seed? What is the neoterminal ileum? What is an osteon? What is sapwood? What are lacteals? What is a platelet plug? What is micropaleontology? What is cyclooxygenase? What is the mesentery?