How is a plant embryo formed?
What will be an ideal response?
Ans: Fertilization results in the formation of a diploid zygote, which undergoes mitosis to become an embryo.
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Which type of tissue performs photosynthesis in leaves?
a. cork b. epidermis c. parenchyma d. phloem
The left side of the heart and the arteries and veins in the body tissues make up the ________ circuit
Fill in the blank(s) with correct word
What is the most ancient group of plants alive today?
a. horsetail b. club moss c. hornworts d. liverworts e. gymnosperms
Which statement about proto-oncogenes is false?
A) Proto-oncogenes are normal genes with the potential to become oncogenes. B) Many proto-oncogenes code for growth factors. C) A mutation must occur in a cell's DNA for a proto-oncogene to become an oncogene. D) If a proto-oncogene's gene product is produced in smaller quantities, a cell may become cancerous.