Hydra and Obelia are cnidarians (species of aquatic organisms) that belongs to the Class Hydrozoa.
Several ways in which Obelia differs from Hydra are;
- Hydra is a predative species that lives on substrates such as wood, while Obelia is a colonial species that lives as polyps on branched frameworks.
- Hydra is found in freshwater habitats, while Obelia is found in marine habitats.
- Hydra undergoes the medusa form in its life cycle, while Obelia undergoes the two forms (polyp and medusa) in its life cycle.
- Hydra has great regenerative powers while Obelia does not have great regenerative powers.
Answer:D
Gametic isolation is a type of prezygotic barrier where the gametes (egg and sperm) come into contact, but no fertilization takes place. Gametes may be unable to recognize one another in different species.
Answer:
C4
Explanation:
Plants present under the conditions of higher temperatures have several adaptations to reduce water loss. One such adaptation is the C4 photosynthetic pathway. In C4 pathways, plants perform the primary fixation of CO2 into C4 acids in mesophyll cells. These C4 acids are then transported to the bundle sheath cells where they are being decarboxylated to release CO2. The released CO2 enters into Calvin cycle and glucose is produced while the C3 acids are transported back to the mesophyll cells to continue the process.
In these plants, RuBisCo is present in bundle sheath cells and the higher concentration of CO2 around this enzyme increases the photosynthetic efficiency by reducing photorespiration. Thereby, these plants have a higher photosynthetic rate and do not need to open stomata more to support photosynthesis.
<h2>Question:- </h2>
If you are to conduct a DNA analysis using a blood sample which of the blood components will you use
<h2>Options :- </h2>
1.) Red Blood Cells
2.) White Blood Cells
3.) Plasma
4.) Platelets
<h2>Answer:- </h2>
Option 2.) White Blood Cells
<h2>Explanation:- </h2>
- Red Blood Cell(RBC) , Plasma , Platelets lack DNA
- White Blood Cell (WBC ) only have DNA
- RBC lack nucleus to make space for O2 as the work is to carry O2 with help of hemoglobin
- Platelets are the cell fragments of the large cells they help in clotting so too lack nucleus
- Plasma is the fluid part of the blood. so it contain water in its most part and too lack DNA bez plasma don't contain any cells
- WBC are the only cells which have well defined nucleus with DNA in above mentioned options
Which limbs the frog uses most to land on where and how he landing.
