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21.Which part of the plant contains the reproductive cells of conifers?a. Coneb.Leaf b c.Rootd.Stem d 21.Why are squash, cucumber and green pepper classified as fruits? Because they_a.are edible.b.are colorful.c.contain seeds.d.came from plants.21.In a flower, the petals’ function is to ___________.a. attract pollinators b. produce pollenc. protect the seeds d. provide food to the plant21.How do the male sex cells reach the ovules of the plant during pollination?a.through the antherb.through the ovaryc.through the petald.through the stigma21.Which of these take place when a zygote is formed?a.fertilizationb.germinationc.pollinationd.seed dispersal

Sagot :

Answer:

1. A. Cone

Conifers don't have showy petals like flowering plants. They belong to the larger gymnosperm division of plants and have both male cones, which produce pollen, and female cones, which contain ovules that develop into seeds.

2. C. Contain seeds

Fruits contain seeds and develop from the flowers of a plant. On the other hand, vegetables are plant's roots, stems or leaves.

3. A. Attract pollinators

Petals (collectively called the corolla) are also sterile floral parts that usually function as visually conspicuous elements serving to attract specific pollinators to the flower.

4. D. Through the stigma

A pollen grain on the stigma grows a tiny tube, all the way down the style to the ovary. This pollen tube carries a male gamete to meet a female gamete in an ovule.

5. A. Fertilization

Fertilization: A Sperm and an Egg Form a Zygote

When a sperm cell penetrates and fertilizes an egg, that genetic information combines. The 23 chromosomes from the sperm pair with 23 chromosomes in the egg, forming a 46-chromosome cell called a zygote. The zygote starts to divide and multiply.