The stage of human embryonic development in which the embryo implants in the uterine wall is the:
A. Blastocyst
B. Gastrula
C. Morula
D. Zygote
Answer: Option A
Solution (By JKExamLibrary)
The blastocyst, a hollow ball of cells with an inner cell mass, hatches from the zona pellucida and implants into the endometrium around day 6-7 after fertilization. The zygote is the fertilized egg, morula is a solid ball, gastrula forms the three germ layers post-implantation.
Explanation:
The sublingual glands are the smallest of the three paired salivary glands, located under the tongue. The parotid is near the ear, submandibular under the jaw.
Explanation:
Meiosis involves two divisions reducing the chromosome number from diploid (2n) to haploid (n), producing gametes (sperm and egg). Mitosis maintains the chromosome number and produces identical somatic cells. Amitosis is direct nuclear division, budding is asexual reproduction. Meiosis ensures genetic diversity.
Explanation:
Photolysis of water occurs at the manganese cluster of photosystem II, releasing electrons, protons, and oxygen. The electrons replace those lost by P680. Photosystem I reduces NADP⁺. Cytochrome b6f transports electrons between the two photosystems. Thus, water splitting is a hallmark of PSII.
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