Yeast is not included in protozoans but in fungi because

• it has chlorophyll

• it shows saprotrophic mode of nutrition

• it has eukaryotic organisation

• cell wall is made up of cellulose and reserve food material as starch

As secondary growth proceeds, in a dicot stem, the thickness of

• sapwood increases

• heartwood increases

• both sapwood and heartwood increases

• both sapwood and heartwood remains the same

Photosynthesis in C₄ plants is relatively less limited by atmospheric CO₂ levels because

• there is effective pumping of CO₂ into bundle sheath cells

• RuBisCO in C4 plants has higher affinity for CO₂

• six carbon acids are the primary initial CO₂ fixation products

• the primary fixation of CO₂ is mediated via PEP carboxylase.

The chemiosmotic coupling hypothesis of oxidative phosphorylation proposes that adenosine triphosphate (ATP) is formed because

• a proton gradient forms across the inner mitochondrial membrane

• there is a change in the permeability of the inner mitochondrial membrane towards adenosine diphosphate (ADP).

• high energy bonds are formed in mitochondrial proteins

• ADP is pumped out of the matrix into the intermembrane space

A plasmolysed cell can be deplasmolysed by placing it in

• isotonic solution

• saturated solution

• pure water or hypotonic solution

• hypertonic solution

Which one of the following is correct for the transmembrane proteins in lipid bilayer of plasma membrane?

• They are absent in animal cells

• They act as channel proteins

• They are absent in plant cells

• They are only externally located

Which of the following is a group of micronutrients for plants?

• Fe, Mn, Cu, Mo, Zn

• Fe, Mn, Cu, O, C

• Cu, B, Cl, Fe, Ca

• Ca, Mg, Fe

18.

Identify the labelled part in the given figure and select the correct option.

• A - Heterocyst, B - Mucilaginous sheath

• A - Mucilaginous sheath, B - Heterocyst

• A - Heterocyst, B - Capsid

• A - Pseudopodia, B - Mucilaginous sheath

Assertion : Gap junctions perform cementing function to keep the neighbouring cells together.

Reason : Tight junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small and big molecules, etc.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false

• If both assertion and reason are false

Assertion : Consciousness is considered as the defining property of living organisms.

Reason : All organisms, from the prokaryotes to the most complex eukaryotes can sense and respond to environmental stimuli.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false