Which of the following is an example of a parasitic plant?
A. Mimosa pudica
B. Nepenthes
C. Cuscuta
D. Aloe vera
Answer: Option C
Solution (By JKSSB Mock Tests)
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:
GIP (glucose-dependent insulinotropic peptide) is released from the small intestine in response to fat and glucose, inhibiting gastric secretion and motility. Gastrin stimulates acid secretion, secretin stimulates bicarbonate, CCK stimulates gallbladder contraction.
Consider statements about plant tissues: 1. Xylem transports water upwards. 2. Phloem transports food bidirectionally. 3. Cambium is a permanent tissue. Which are correct?
Explanation:
Xylem is responsible for the unidirectional upward transport of water and minerals from roots to shoots. Phloem transports organic nutrients (food) from sources to sinks, which can be bidirectional (up or down). Cambium (vascular and cork) is a lateral meristematic (dividing) tissue responsible for secondary growth, not a permanent tissue. Thus, statements 1 and 2 are correct.
Explanation:
Alveoli are tiny, thin-walled air sacs surrounded by a network of pulmonary capillaries. Oxygen diffuses from alveolar air into blood, and CO₂ diffuses from blood into alveolar air. Bronchi and bronchioles are air passages, trachea is the windpipe. The large surface area of alveoli (about 70 m²) facilitates efficient gas exchange.
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