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Thepotemich [5.8K]
3 years ago
6

Help please. Thank you!

Biology
1 answer:
zhuklara [117]3 years ago
5 0

Each cell contians 23 pairs of chromosomes

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Write components of xylem and phylem ?
aleksandrvk [35]
  • Xylem contains tracheids, vessels, xylem parenchyma and xylem fibre.
  1. Tracheids: They are elongated, tubular dead cells with tapering end walls.
  2. Vessels: These are also known as trachea. They are elongated, tubular dead cells. They are joined to each other by end to end forming a continuous pipe. The cells are thick and lignified.
  3. Xylem parenchyma: They are also called wood parenchyma. This is the only living tissue of xylem.
  4. Xylem fibre: They are dead cells with thick walled fibre.

  • Phloem consists of sieve tubes, companion cells, phloem parenchyma and phloem fibres.
  1. Sieve tubes: These are elongated, tubular living cells arranged in a row, with their perforated end walls forming a sieve. They are non-nucleated. Their protoplasm are inter-connected through sieve plates. They possess vacuoles.
  2. Companion cell: They are elongated, lens-shaped cells containing dense cytoplasm and prominent nuclei. These cells maintain connection with sieve cells through pits.
  3. Phloem parenchyma: They are living thin walled parenchyma cells.
  4. Phloem fibre: They are also known as bast fibre. They are elongated fibre like sclerenchymatous dead cells with thick walls containing pits and interlocked ends. Phloem fibre are the only dead cells in phloem.

Hope you could get an idea from here.

Doubt clarification - use comment section.

5 0
2 years ago
Why do you have to check the blood types for donor a recipient for an organ transfer
kakasveta [241]

Answer:

because it can cause you severe reaction that could kill you

8 0
3 years ago
How many bones are there in donkey​
Dmitry [639]

Answer:

205 bones

Explanation:

Donkeys and horses share the same skeletal system. Donkey’s bones are slow to mature in diameter and length.

3 0
3 years ago
Veins returning to the heart can close to prevent the backflow of blood. Which component in the veins contributes to this proces
givi [52]
Compared to arteries, valves have no pulse, have thin walls and have valves that prevent backflow of the blood. The pressure in the veins is less than that of the arteries, hence, there is no pulse. They are nearer to the surface of the skin. It also connects arteries and capillaries which transport blood all throughout the circulatory system.
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These plants lack flowers and seeds. Which of the following is described by this star?
Lapatulllka [165]
Angiosperms are known as flowering plants. Gymnosperms are seed producing plants like trees that don’t have flowers, so that leads you to ferns and horsetails. Ferns have spores on them that they use to reproduce with and they don’t have flowers . -isboggio
7 0
3 years ago
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