#Question id: 10906
#Unit 6. System Physiology – Plant
The pressure-flow model explains phloem translocation as a flow of solution (bulk flow) driven by an osmotically generated pressure gradient between source and sink.
a) Phloem translocation, both active and passive mechanisms were considered. All theories, both active and passive, assume an energy requirement in both sources and sinks.
b) In sources, energy is necessary to move photosynthate from producing cells into the sieve elements. This movement of photosynthate is called phloem loading.
c) In sinks, energy is essential for some aspects of movement from sieve elements to sink cells, which store or metabolize the sugar. This movement of photosynthate from sieve elements to sink cells is called phloem unloading.
d) The Active mechanisms of phloem transport further assume that energy is required in the sieve elements of the path between sources and sinks simply to maintain structures.
From the given statements find out the correct for pressure-flow model.
#Question id: 14480
#Unit 13. Methods in Biology
#Question id: 11408
#Unit 10. Ecological Principles
According to IUCN red list criteria , a species would be classified on the basis of following criteria are a- >50 decline in population during last 10 year b-occur in area less than 20,000 sq km c- total adult population less than 2500 Above observation which of the following class of IUCN
#Question id: 7258
#Unit 5. Developmental Biology
A four-cell embryo normally develops into a blastocyst
consisting of trophectoderm (TE) cells on the outside and inner cell mass (ICM)
cells inside. The transplantation experiments were done with mouse embryos.
A. If a labeled cell is placed on the outside of a very early
embryo, it is likely to form extraembryonic tissues.
B. If a labeled cell is placed on the inside of a very early embryo, it is likely to form embryonic tissues.
According to above observations which of the following statement is true?
#Question id: 32224
#Unit 2. Cellular Organization
For optimal activity, lysosomal acid hydrolases requires:
a. Activation by proteasomal degradation
b. Activation by proteolytic cleavage
c. Requires an acid environment