ehd123

Grass/Weed

Grass/Weed

Hello again sirs/madams! Who can help me in showing or explaining the parts of a grass/weed?

minissa   1507   5 Replies

duddy

Plants Diversity II

Plants Diversity II

1. In lower plants, the spore is the only protective stage in the plant cycle. Why do seed plants have an advantage over spore-producing plants.

2. What are the main differences between gymnosperms and angiosperms?

3

Ashmo   3153   1 Reply

bio_man

Chromophore of Phytochrome

Chromophore of Phytochrome

How does the chromophore’s shape change after absorption of
light and what does this do the phytochrome protein to allow for a different function?

Thank you!

Octoshark   1802   1 Reply

bio_man

Etiolated Seedlings

Etiolated Seedlings

What are etiolated seedlings trying to do, and what does a red light flash do to the etiolated
seedling?

Thanks

Octoshark   2065   2 Replies

ThePsychic

Siblicide: Hyenas

Siblicide: Hyenas

For a mammalian example, spotted hyena females often give birth to twins, and the pups complete aggresively for their mother's milk. The battles between pups sometimes leads to the death of one of the twins. Test the proposition that these cases

Kelly185891   2546   2 Replies

lewis

Sexual Animal Behavior

Sexual Animal Behavior

In their classic paper on mating systems. (Emlen S & Oring L. Ecology, sexual selection, and the evolution of mating systems. Science 197:215-23, 1977), Steve Emlen and Lew Oring suggested that two ecological factors could promote the evolution o

Kelly185891   2174   1 Reply

bio_man

Cry Baby!

Cry Baby!

Birds are not the only animals in which offspring have special signals that appear to communicate need to a parent.  After reading the section of Chapter 9 Why Do Baby Birds Beg So Loudly?, develop an evolutionary analysis of crying

Kelly185891   1910   1 Reply

bio_man

Animal Behavior: Choosing Where to Live

Animal Behavior: Choosing Where to Live

In one study of brown bears (grizzlies) in Sweden, 15 of 16 males left their mothers and natal territories behind while only 13-32 females dispersed. Older and heavier females were less likely to be part of the dispersing cohort. So here, as in Beldi

Kelly185891   2682   1 Reply

bio_man

Hestiate Cat Adoption (What do I do?)

Hestiate Cat Adoption (What do I do?)

I was wondering, someday I hope to get a kitten. If I raise that kitten around my two dogs and it doesn't fear them will the cat not fear other dogs? Also if you have two dogs and a fully grown cat and you seenthe dogs hate the cat and bark at i

Kelly185891   1154   1 Reply

duddy

If plants capture light energy and convert it to chemical energy stored in sugar and other molecules

If plants capture light energy and convert it to chemical energy stored in sugar and other molecules

If plants capture light energy and convert it to chemical energy stored in sugar and other molecules. If this was correct, then wouldn't all plants taste sugary and sweet? spinach and lettuce doesn't taste sweet. Most veggies don't or

oldcollegelady   1775   3 Replies

bio_man

Sparrows

Sparrows

White-crowned sparrows in Alaska and Washington State sing different dialects. With the white-crowned and golden-crowned sparrows, we have two closely related birds whose ranges overlap. If the songs of the birds evolved to prevent interspecific mati

Kelly185891   1142   2 Replies

bio_man

Finding if cellulase activity is intrinsic or symbiotic

Finding if cellulase activity is intrinsic or symbiotic

Can you suggest some simple experiment to determine if the cellulase activity in an animal is intrinsic or is symbiotic in origin?

I thought of this experiment but am not sure:-
Maintain temperature and pressure at which s

visharad   3306   3 Replies

duddy

Absorption rate of proteins in carnivores?

Absorption rate of proteins in carnivores?

In order to solve a problem, I need to know some typical value of the absorption rate of proteins (amino acids) in carnivores. Can you give some typical value for this? If the answer is in nmom min-1 cm-2, then good. But other units will also do. Jus

visharad   1812   1 Reply

bio_man

Positive and Negative Tropism

Positive and Negative Tropism

Explain the difference between positive and negative tropism. Give one example of each.

ppk   7544   1 Reply

duddy