Which of the following is an example of a parasitic plant?
A. Mimosa pudica
B. Cuscuta
C. Aloe vera
D. Nepenthes
Answer: Option B
Solution (By JKExamLibrary)
Cuscuta (dodder) is a total stem parasite that wraps around the host plant and absorbs nutrients through haustoria. It lacks chlorophyll and leaves. Mimosa is sensitive plant, Nepenthes is insectivorous, Aloe vera is a succulent. Parasitic plants derive some or all of their nutrition from other living plants. Cuscuta is economically important as a weed.
Explanation:
The lymphatic system drains excess tissue fluid (lymph) back to the venous blood. Blood circulation is the cardiovascular system; lymph nodes filter lymph; thymus is a primary lymphoid organ.
Explanation:
The radicle is the embryonic root, and it is the first structure to emerge from the seed coat during germination, growing downward to anchor the plant and absorb water. The plumule becomes the shoot, hypocotyl connects radicle to cotyledons, cotyledons are seed leaves.
Explanation:
Biotin is a coenzyme for carboxylation enzymes, including pyruvate carboxylase (gluconeogenesis) and acetyl-CoA carboxylase (fatty acid synthesis). Thiamine (B₁) is for decarboxylation, riboflavin (B₂) for redox, folate (B₉) for one-carbon transfers. Biotin is often bound to lysine in enzymes.
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