Consider the following statements about ecosystem: 1. Producers are autotrophs. 2. Consumers are heterotrophs. 3. Decomposers recycle nutrients. Which of the above is/are correct? MCQ with Answer and Explanation

Explanation:
In aquatic plants like Hydrilla, the rate of photosynthesis can be estimated by counting the number of oxygen bubbles released per minute under light. Manometry measures pressure changes, respirometry respiration, spectrophotometry light absorbance.

Explanation:
Photosynthesis consists of light-dependent reactions occurring in the thylakoid membranes (grana) where water is split, releasing oxygen, and light-independent reactions (Calvin cycle) occurring in the stroma where CO2 is fixed. The oxygen released during photosynthesis comes from the photolysis of water, not from carbon dioxide. Thus, statements 1 and 2 are correct.

Explanation:
Estrogen, secreted by the developing ovarian follicles, promotes the development of female secondary sexual characteristics such as breast development, widening of hips, and distribution of body fat. Testosterone is the male sex hormone. Progesterone prepares the uterus for pregnancy, and prolactin stimulates milk production.