CATDOLL : CATDOLL: Why can kelp reproduce without seeds?

1. Why can kelp reproduce without seeds?

Kelp is an algae, it reproduces by spores

Phaeophyceae, Laminariales, Laminariaceae, Laminaria

2. Which of the following statements about kelp is incorrect? ( ) A. Because the cells contain only brown pigments, the plant body is brown B. Reproduction by spores

Kelp is an algae plant with a simple structure and no differentiation of roots, stems, and leaves. There are chlorophyll, carotene, and xanthophyll in the cells. Among them, there is a kind of xanthophyll pigment called fucoxanthin. The content of this xanthophyll pigment is large, which covers the chlorophyll and makes the algae body brown. However, ordinary plants have more chlorophyll, so they appear green. Algae plants do not produce seeds, but produce spores, which reproduce offspring. Kelp and other marine algae are rich in iodine. Regular consumption can prevent goiter. It can be seen that A meets the requirements of the question.

So choose: A

3. Which of the following does not reproduce by seeds: apple, silver fir, kelp, or magnolia?

kelp.

Apples and magnolias are angiosperms, and silver fir is a gymnosperm. All are seed plants that reproduce by seeds. Kelp is an algae that reproduces asexually using spores and sexually using zygotes. Neither spores nor zygotes can be called seeds. Seeds refer specifically to angiosperms or gymnosperms.

Kelp. It reproduces by spores.

C. Laver, gourd moss, fern, apple, cycad D. Spirogyra, liverwort, viviparous dog spine, magnolia, metasequoia ginkgo, cycad, metasequoia are all gymnosperms, so choose A A. Kelp (algae), gourd moss (moss)

kelp

4. What are the common characteristics of kelp and nephrodisiac? A. Both live in water B. Both reproduce through spores C. Both have no real roots

C Kelp is an algae plant that lives in the sea and reproduces freely; Nephrolepis is a fern plant that lives on land and reproduces by spores; neither Kelp nor Nephrolepis has roots to absorb nutrients from the soil, only fixed roots

5. Which of the following statements about kelp is correct? ( ) A. Kelp has roots and leaves, but Spirogyra does not. B. Kelp cannot photosynthesize.

Kelp is a multicellular algae plant with a simple structure and no differentiation of roots, stems, and leaves. There are chlorophyll, carotene, and xanthophyll in the cells. Among them, there is a kind of xanthophyll pigment called fucoxanthin. The content of this xanthophyll pigment is large, which covers the chlorophyll and makes the algae body brown. However, ordinary plants have more chlorophyll, so they appear green. Algae plants do not produce seeds, but produce spores, which reproduce offspring. Kelp and other marine algae are rich in iodine. Regular consumption can prevent goiter.

So choose: C

Sixth and seventh grade biology

The new cells produced after cell division have the same chromosomes (shape) and (number) as the original cells, so the (genetic material) they contain is also the same.