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Gastrulation and PlacentatioN are the process involved in embryo development.

The gastrulation is a process Involving the development of multilayered embryo from single layered fertilized egg . The process of gastrulation give rise to multiple organs and along with that it also helps in establishment of connection between the

Hello student,

Microsporogenesis is defined as the formation of microspores from microspore mother cells by meiosis . It occurs inside the pollen sac of the anther.

Megasporogenesis is defined as the process of arrangement of megaspores from the megaspore mother cell. It occurs in the ovule of the ovary.

• Meiosis

Hello aspirant,

Criss-cross inheritance is inheritance of X linked characters. The characters are transferred from mother to her son and from father to his daughter. Hemophilia C is an example.

Stammering although is a genetic disorder but there is no research yet to classify it under disorder of X linked

Hello Aspirant,

• Amphibians of Plant kingdom is called Bryophytes .
• Generally amphibian means they can survive both water and soil .
• Bryophytes can live in both water and soil. For Generally they living on soil for complete their fertilization circle they need water.
• Bryophytes are mostly found on marshy and

commonly the right atrium and ventricle are referred together as the right heart and their left counterparts as the left heart There is contraction and relaxation of the muscles in the chambers of the heart which is responsible for the pumping of the blood to the parts of the body.

Metastasis is the process by which cancer spreads from the place at which it first arose as a primary tumor to distant locations in the body.

Hello aspirant

Heterocytes are specialized and enlarged cells with thick cell walls . Heterocytes are present in nitrogen fixing cyanobacteria.

Heterocytes lack chlorophyll therefore they are  colourless . They synthesize enzyme nitrogenase . With help of enzyme nitrogenase they perform the function of nitrogen fixation.

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Answer is papaya,date palm e.t.c

Papaya ,date palm e.t.c are dioecious plants.That is both male and female flowers are present in different plants.So autogamy (i.e self-pollination)is prevented and gietonomy (i.e self -pollination on the same plant but different flowers) is prevented.

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