(i) Label port A

Biology

1 answer:

just olya [345]3 years ago

7 0

Answer:

1) pollen grain (A), stigma (B), pollen tube (C), Ovary (D)

The pollen grain is a male reproductive part while ovary is the female reproductive part.

2) When a pollen grain lands on the stigma of a flower, a pollen tube begins to grow. It grows through the style until it reaches an ovule inside the ovary.

3) The pollen tube is a tube that transports the male gamete cells from the pollen grains to the ovule (female gamete) inside the ovary.

The nucleus of the pollen passes along the pollen tube and fuses with the nucleus of the ovule. This process is called fertilisation.

4) After the fertilisation, female parts of the flower develop into fruit and ovules become seeds.

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Which structures are responsible for mechanical breakdown of food

just olya [345]

Your teeth
You’re welcome :)

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2 years ago

Scientists have recently discovered a community of bacteria and clams living under an ice shelf in Antarctica. These organisms l

Shkiper50 [21]

Answer:

Option 3, of the abiotic factors found in their environment

Explanation:

The abiotic factors such as absence of sunlight and extremely cold temperature represents picture of an extreme habitat under an ice shelf in Antarctica.

The optimum temperature requirements of bacteria for its survival ranges from 10oC to 20oC. In case, if a bacteria lives in an environment where temperature is less than -5oC or higher than 50oC, then such habitats are considered to be “habitats with extremities” as special physiological mechanisms are required to maintain the homeostasis and survive.

Likewise absence of sunlight further adds to the extremities of the habitat.

Option 3, is correct

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3 years ago

Water can "defy gravity" and climb uphill? True or false. Why or why not

harina [27]

The answer is actually true.

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Hope this helps! If it does, would you mind marking my answer as Brainliest? Thanks :D

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3 years ago

"Cells in the lining of the stomach produce a protein called pepsinogen. When this protein is released into the chamber of the s

Sergio [31]

This is an example of Precursor gene regulation (protein translation) type of eukaryotic gene regulation.

Explanation:

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Once food is consumed, the hormone gastrine and the vagus nerve cause the secretion of both pepsinogen and HCl from the stomach lining. Hydrochloric acid induces an acidic environment that allows pepsinogen to unfold in an autocatalytic manner and thus generates pepsin the active form.

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Some individuals have defective genes for LDL receptor receptors rendering them nonfunctional. Individuals with these mutations

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Individuals with these mutations typically have familial hypercholesterolemia.
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3 years ago

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