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TLS Online TPP Program

#Question id: 58

A covalent chemical bond is one in which ________.

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged

  2. protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms

  3. outer-shell electrons of two atoms are shared so as to satisfactorily fill their respective orbitals

  4. outer-shell electrons of one atom are transferred to fill the inner electron shell of another atom

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TLS Online TPP Program

#Question id: 14709

#Unit 5. Developmental Biology

Choose right statement about cleavage pattern and gastrulation movements;
1.At the end of cleavage the animal embryo is essentially a closed sheet of cells, which is often in the form of a sphere enclosing a fluid-filled interior. Gastrulation, strictly the formation of the gut, converts this sheet into a solid three-dimensional embryonic animal body. 
2.During cleavage, cells move into the interior of the embryo, and the regions of endoderm. and mesoderm. which were originally adjacent in the cell sheet, take up their appropriate positions in the embryo.
3. Gastrulation results from a well- defined spatio-temporal pattern of change in cell shape, cell movement, and change in cell adhesiveness, the main forces of which are generated by localized contractions.
TLS Online TPP Program

#Question id: 14710

#Unit 5. Developmental Biology

Splitting of one cellular sheet into two more or less parallel sheets. While on a cellular basis it resembles ingression, the result is the formation of a new (additional) epithelial sheet of cells, choose right gastrulation movement;
TLS Online TPP Program

#Question id: 14711

#Unit 5. Developmental Biology

Choose right explanations of gastrulation movements,  
TLS Online TPP Program

#Question id: 14712

#Unit 5. Developmental Biology

 Match the following cleavage pattern, with their egg type and cleavage type

CLEAVAGE PATTERNEGG TYPECLEAVAGE TYPE
1. HOLOBLASTIC CLEAVAGEa. IsolecithalI. Spiral cleavage
b. MesolecithalII. Displaced radial cleavage
2. MEROBLASTIC CLEAVAGEc. TelolecithalIII. Discoidal cleavage
d. CentrolecithalIV. Superficial cleavage
TLS Online TPP Program

#Question id: 14713

#Unit 5. Developmental Biology

Match their cleavage patterns with their belonging animals;

CLEAVAGE PATTERNANIMALS
1. HOLOBLASTIC BILATERAL CLEAVAGEP. Tunicates
2. MEROBLASTIC BILATERAL CLEAVAGEQ. Cephalopod molluscs
3. MEROBLASTIC DISCOIDAL CLEAVAGER. Amphibians
4. HOLOBLASTIC DISPLACED RADIAL CLEAVAGES. Reptiles
TLS Online TPP Program

#Question id: 14714

#Unit 5. Developmental Biology

Eggs are grouped into three types on the basis of the distribution of yolk present in them, choose right combinations accordingly,