The process of movement of molecules from high to low concentration without energy is: MCQ with Answer and Explanation

Explanation:
Producers (green plants, algae, cyanobacteria) form the first trophic level, converting solar energy into biomass. Consumers depend on them.

Explanation:
Ethylene (C₂H₄) is a gaseous hormone that promotes fruit ripening, senescence, and abscission. It is the only gaseous plant hormone.

Explanation:
Robert Hooke, in his 1665 book 'Micrographia', described observing dead cork tissue under a microscope and coined the term 'cell' for the small, box-like compartments he saw. Antonie van Leeuwenhoek, using his superior handcrafted single-lens microscopes in the 1670s, was the first person to observe and describe living, single-celled microorganisms, which he called 'animalcules'. Charles Darwin proposed the theory of evolution by natural selection; the cell theory was proposed by Schleiden and Schwann. Thus, statements 1 and 2 are correct.