STD 12 - 1. sexual reproduction in flowering plants — NEET STD 11 Science — Question

Pertaining to human population if there is a decrease in competition, it would be the result of

Mode of nutrition in Rhizopus is

Primary root and its branches constitute

The most effective wavelength of visible light in photosynthesis is in the region of

Assertion: Meiosis-l is reductional division while meiosis-II is equational division.
Reason: In meiosis-I chromosome numbers become half in compare to parental cell while in meiosis-II no change in chromosome number.

Which of the following statements are correct for effect of Carbon dioxide concentration on photosynthesis ?
(i) Increase in concentration up to 0.05 per cent can cause an increase in CO₂ fixation rates; beyond this the levels can become damaging over longer periods
(ii) The C₃ and C₄ plants respond differently to CO₂ concentrations
(iii) At low light conditions neither C₃ nor C₄ responds to high CO₂ conditions
(iv) At high light intensities, both C₃ and C₄ plants show increase in the rates of photosynthesis
(v) C₄ plants show saturation at about 360 µ1L^-1 while C₃ responds to increased CO₂ concentration and saturation is seen only beyond 450 µ1L^-1
(vi) Current availability of CO₂ levels in atmosphere is limiting to the C₃ plants

The body structure of green algae may be

Mitosis is the process by which eukaryotic cells

Life cycles of Ectocarpus and Fucus respectively are