STD 11 - 8. Cell the unit of life — NEET STD 11 Science — Question

Coenocytic mycelium is found in

It is not concern with protein synthesis

Which statement is correct for photosynthesis regarding light ?
(i) There is a linear relationship between incident light and CO₂ fixation rates at low light intensities
(ii) At higher light intensities, gradually the rate does not show further increase as other factors become limiting
(iii) Light saturation occurs at 10 per cent of the full sunlight. Hence, except for plants in shade or in dense forests, light is rarely a limiting factor in nature
(iv) Increase in incident light beyond a point causes the breakdown of chlorophyll and a decrease in photosynthesis
(v) When light intensity increase than first rate of photosynthesis increase then becomes constant due to CO2 becomes limiting factor

To avoid the competive exclusion principle two similar species live in same area, they may evolve to become more different in order to

Which of the following statements about enzymes are true ?
(i) Enzymes do not alter the overall change in free energy for a reaction.
(ii) Enzymes are proteins whose three dimensional shape is key to their functions.
(iii) Enzymes speed up reactions by lowering activation energy.
(iv) Enzymes are highly specific for reaction.
(v) The shape of an enzyme does not effect its activity.
(vi) The energy input needed to start a chemical reaction is called activation energy.

Which of the following shows maximum genetic diversity in India?

Which of the following statement is correct about the gametophytic stage in the alteration of generation with in the life cycle?

The animal cell is different from a plant cell in having

Apical growth of the lower vascular plants takes place by an apical cell. This cell is generally pyramidal. Though four-sided in shape, it is often referred to as three-sided cell because

The photosystem connected with splitting of water is