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Mashutka [201]
2 years ago
6

Why cycus are called conifer? give its 3major characteristics features​

Biology
1 answer:
Licemer1 [7]2 years ago
8 0

Answer:

Cycads /ˈsaɪkædz/ are seed plants that typically have a stout and woody (ligneous) trunk with a crown of large, hard, stiff, evergreen and (usually) pinnate leaves. The species are dioecious, therefore the individual plants of a species are either male or female. Cycads vary in size from having trunks only a few centimeters to several meters tall. They typically grow very slowly[3] and live very long, with some specimens known to be as much as 1,000 years old.[citation needed] Because of their superficial resemblance, they are sometimes mistaken for palms or ferns, but they are not closely related to either group.

Cycads are gymnosperms (naked seeded), meaning their unfertilized seeds are open to the air to be directly fertilized by pollination, as contrasted with angiosperms, which have enclosed seeds with more complex fertilization arrangements. Cycads have very specialized pollinators, usually a specific species of beetle. Both male and female cycads bear cones (strobili), somewhat similar to conifer cones.

Cycads have been reported to fix nitrogen in association with various cyanobacteria living in the roots (the "coralloid" roots).[4] These photosynthetic bacteria produce a neurotoxin called BMAA that is found in the seeds of cycads. This neurotoxin may enter a human food chain as the cycad seeds may be eaten directly as a source of flour by humans or by wild or feral animals such as bats, and humans may eat these animals. It is hypothesized that this is a source of some neurological diseases in humans.[5][6]

Cycads all over the world are in decline, with four species on the brink of extinction and seven species having fewer than 100 plants left in the wild.[7] The plant has a very long fossil history, with evidence that they existed in greater abundance and in greater diversity before the Jurassic and late Triassic mass extinction events.

Explanation:

~Dr.Smiley~

(Jane)

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Bacterium that causes tetanus is an anaerobe but it has a blank before anaerobe​
Tamiku [17]

Answer:

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Explanation:

Characteristics of Clostridium Tetani

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Which parts of the plants do they show? (A,B,C,D)<br><br>And 21.question please​
likoan [24]

Answer no 1:

The part labelled A is the upper epidermis . The main function of the epidermis is to protect the structure of the leaf.

The part labelled B is palisade tissues. These are the sites where the chlorophyll are present.

The part labelled C are the air spaces in the spongy mesophyll tissue. They allow carbon dioxide to move freely.

The part labelled D are the vascular tissues which transport water and food.

Answer No 20:

The correct option is B) Most of the carbohydrates are made in the palisade mesophyll.

The palisade mesophyll comprises of chloroplast which are the sites where photosynthesis takes place. Hence, these will be the sites where carbohydrates will be manufactured.

Answer No 21)

The correct option is A) upper epidermis

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6 0
3 years ago
URGENTTT
suter [353]

Answer:

D Independent assortment occurs when chromosomes separate during meiosis and causes variations that can be beneficial or harmful to a species

Explanation:

During meiosis, the homologous chromosomes separate and segregate independently of each other. This process is referred to as 'independent assortment'. In consequence, different gene variants or 'alleles' localized in homologous chromosomes segregate independently of each other during gamete formation, thereby one particular gamete has an equal probability to carry either of these segregating alleles. Independent assortment generates genetic variation in the gametes, which can be beneficial or deleterious in a given environment.

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schepotkina [342]

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3 years ago
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Citrus2011 [14]

Answer:

Deer’s Point of View


What would you do if you did not have clean oxygen to breathe?  The air is being polluted because of your factories and car fumes. It’s causing global warming and even negatively affecting the Polar Bears. You need to be aware of the other living organisms and environments. Remember, you can’t turn back time, so don’t wait until many more species are extinct, act now.

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